{
 "instance": {
  "tve-20200930.htm": {
   "axisCustom": 8,
   "axisStandard": 26,
   "contextCount": 717,
   "dts": {
    "calculationLink": {
     "local": [
      "tve-20200930_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "tve-20200930_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-eedm-def-2020-01-31.xml",
      "http://xbrl.fasb.org/srt/2020/elts/srt-eedm1-def-2020-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "tve-20200930.htm"
     ]
    },
    "labelLink": {
     "local": [
      "tve-20200930_lab.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/srt/2020/elts/srt-doc-2020-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-doc-2020-01-31.xml",
      "https://xbrl.sec.gov/dei/2020/dei-doc-2020-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "tve-20200930_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "https://xbrl.sec.gov/dei/2020/dei-ref-2020-01-31.xml",
      "http://xbrl.fasb.org/srt/2020/elts/srt-ref-2020-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-ref-2020-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "tve-20200930.xsd"
     ],
     "remote": [
      "http://xbrl.fasb.org/srt/2020/elts/srt-types-2020-01-31.xsd",
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-roles-2020-01-31.xsd",
      "http://xbrl.fasb.org/srt/2020/elts/srt-roles-2020-01-31.xsd",
      "https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-types-2020-01-31.xsd",
      "https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd",
      "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "http://xbrl.fasb.org/us-gaap/2020/elts/us-parts-codification-2020-01-31.xsd"
     ]
    }
   },
   "elementCount": 1314,
   "entityCount": 1,
   "hidden": {
    "http://fasb.org/us-gaap/2020-01-31": 59,
    "http://www.tva.gov/20200930": 25,
    "http://xbrl.sec.gov/dei/2020-01-31": 10,
    "total": 94
   },
   "keyCustom": 260,
   "keyStandard": 483,
   "memberCustom": 110,
   "memberStandard": 75,
   "nsprefix": "tve",
   "nsuri": "http://www.tva.gov/20200930",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:EntityRegistrantName",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "000010001 - Document - DEI Document",
     "role": "http://www.tva.gov/role/DEIDocument",
     "shortName": "DEI Document",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:EntityRegistrantName",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210101002 - Disclosure - Impact of New Accounting Standards and Interpretations",
     "role": "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretations",
     "shortName": "Impact of New Accounting Standards and Interpretations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R100": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Changeinotherincomeexpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240834045 - Disclosure - Other Income (Expense), Net Other Income (Expense), Net (Details)",
     "role": "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails",
     "shortName": "Other Income (Expense), Net Other Income (Expense), Net (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Changeinotherincomeexpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R101": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:FixedAndVariableFundMaximumAnnualContribution",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240874047 - Disclosure - Benefit Plans Components of Benefit Plans (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
     "shortName": "Benefit Plans Components of Benefit Plans (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:FixedAndVariableFundMaximumAnnualContribution",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R102": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Amountrelatedtochangeinnumberofparticipants",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240884048 - Disclosure - Benefit Plans Obligations and Funded Status (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
     "shortName": "Benefit Plans Obligations and Funded Status (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Amountrelatedtochangeinnumberofparticipants",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R103": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RegulatoryAssetsNoncurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240894049 - Disclosure - Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
     "shortName": "Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i3e5d4b7ae5dd4ee09d5cbfe4023e8140_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R104": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RegulatoryAssetsNoncurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240904050 - Disclosure - Benefit Plans Postretirement Benefit Costs Deferred as Regulatory Assets (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
     "shortName": "Benefit Plans Postretirement Benefit Costs Deferred as Regulatory Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:ScheduleOfDefinedBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i3e5d4b7ae5dd4ee09d5cbfe4023e8140_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanAmountsDeferredAsRegulatoryAssetsNetPriorServiceCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R105": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:ScheduleOfProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExessOfPlanAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ic0814eca3ba2472cb7a3a41ec5a5a924_I20190930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240914051 - Disclosure - Benefit Plans Projected Benefit Obligations and Accumulated Benefit Obligations in Exess of Plan Assets (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
     "shortName": "Benefit Plans Projected Benefit Obligations and Accumulated Benefit Obligations in Exess of Plan Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:ScheduleOfProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExessOfPlanAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ic0814eca3ba2472cb7a3a41ec5a5a924_I20190930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R106": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "if16af33c006649b090f42efce4753b04_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanServiceCost",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240924052 - Disclosure - Benefit Plans Components of Net Periodic Benefit Cost (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
     "shortName": "Benefit Plans Components of Net Periodic Benefit Cost (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "if16af33c006649b090f42efce4753b04_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R107": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:ScheduleOfExpectedAmortizationOfPensionAndPostretirementBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetPriorServiceCostCredit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240934053 - Disclosure - Benefit Plans Expected Amortization of Regulatory Assets in Next Fiscal Year (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
     "shortName": "Benefit Plans Expected Amortization of Regulatory Assets in Next Fiscal Year (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:ScheduleOfExpectedAmortizationOfPensionAndPostretirementBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetPriorServiceCostCredit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R108": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "4",
      "first": true,
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanCostOfLivingAdjustmentAssumption",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240944054 - Disclosure - Benefit Plans Actuarial Assumptions (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
     "shortName": "Benefit Plans Actuarial Assumptions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "if16af33c006649b090f42efce4753b04_D20191001-20200930",
      "decimals": "4",
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R109": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "4",
      "first": true,
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanCostOfLivingAdjustmentAssumption",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240954055 - Disclosure - Benefit Plans Sensitivity to Certain Changes in Pension Assumptions (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails",
     "shortName": "Benefit Plans Sensitivity to Certain Changes in Pension Assumptions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ie71ea97bbb4e47fe87b9b888cbff0d6d_I20200930",
      "decimals": "4",
      "lang": "en-US",
      "name": "tve:ChangeInDiscountRateOrRateOfReturnOnPlanAssetsAssumption",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210131003 - Disclosure - Accounts Receivable, Net",
     "role": "http://www.tva.gov/role/AccountsReceivableNet",
     "shortName": "Accounts Receivable, Net",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R110": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ib20bf2c0150940368685f7f97fc34d5f_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240964056 - Disclosure - Benefit Plans Sensitivity to Changes in Assumed Health Care Cost Trend Rates (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails",
     "shortName": "Benefit Plans Sensitivity to Changes in Assumed Health Care Cost Trend Rates (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ib20bf2c0150940368685f7f97fc34d5f_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R111": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240974057 - Disclosure - Benefit Plans Asset Holdings (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
     "shortName": "Benefit Plans Asset Holdings (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R112": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:FairValuePlanAssetsGross",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240984058 - Disclosure - Benefit Plans Fair Value Measurements (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
     "shortName": "Benefit Plans Fair Value Measurements (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:DefinedBenefitPlanFairValueOfPlanDerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R113": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:NetPayables",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240994059 - Disclosure - Benefit Plans Fair Value Measurements Using Significant Unobservable Inputs (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
     "shortName": "Benefit Plans Fair Value Measurements Using Significant Unobservable Inputs (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ieebb7829d3514748bc7a33fc7a758c79_D20181001-20190930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:PrivateEquityReclassedToPrivateRealAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R114": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i3e5d4b7ae5dd4ee09d5cbfe4023e8140_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241004060 - Disclosure - Benefit Plans Estimated Future Benefit Payments (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
     "shortName": "Benefit Plans Estimated Future Benefit Payments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i3e5d4b7ae5dd4ee09d5cbfe4023e8140_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R115": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i15164d19da8b4f9e8cc18b5f57a583bc_D20201001-20210930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DefinedContributionPlanCostRecognized",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241014061 - Disclosure - Benefit Plans Contributions (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansContributionsDetails",
     "shortName": "Benefit Plans Contributions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:OtherPostretirementBenefitsPayments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R116": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "4",
      "first": true,
      "lang": "en-US",
      "name": "tve:PostEmploymentBenefitsAssumptionsUsedCalculatingNetPeriodicBenefitCostAndUnpaidBenefitObligationDiscountRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241024062 - Disclosure - Benefit Plans Other Postemployment Benefits (Details)",
     "role": "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails",
     "shortName": "Benefit Plans Other Postemployment Benefits (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "4",
      "first": true,
      "lang": "en-US",
      "name": "tve:PostEmploymentBenefitsAssumptionsUsedCalculatingNetPeriodicBenefitCostAndUnpaidBenefitObligationDiscountRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R117": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:Megawattsprovidedundertransmissionobligations",
      "reportCount": 1,
      "unitRef": "megawatts",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241054063 - Disclosure - Commitments and Contingencies - Table (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
     "shortName": "Commitments and Contingencies - Table (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R118": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "us-gaap:OtherCommitmentsTableTextBlock",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i7a98d507c88840cbbef6ea0f41db0faa_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ContractualObligationDueInNextTwelveMonths",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241064064 - Disclosure - Commitments and Contingencies - Energy Prepayment Obligations (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
     "shortName": "Commitments and Contingencies - Energy Prepayment Obligations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R119": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ia2da5717574e4986940d8ab921fa3a33_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241074065 - Disclosure - Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
     "shortName": "Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinnexttwelvemonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210161004 - Disclosure - Inventories, Net",
     "role": "http://www.tva.gov/role/InventoriesNet",
     "shortName": "Inventories, Net",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R120": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherCommitmentDueInNextTwelveMonths",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241084066 - Disclosure - Commitments and Contingencies - Leases (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
     "shortName": "Commitments and Contingencies - Leases (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R121": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:MegawattsProvidedUnderPowerPurchaseObligations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "megawatts2",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241094067 - Disclosure - Commitments and Contingencies - Purchase Obligations (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
     "shortName": "Commitments and Contingencies - Purchase Obligations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:MegawattsProvidedUnderPowerPurchaseObligations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "megawatts2",
      "xsiNil": "false"
     }
    },
    "R122": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LossContingencyDamagesSoughtValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241104068 - Disclosure - Commitments and Contingencies - Contingencies (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
     "shortName": "Commitments and Contingencies - Contingencies (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:NuclearLiabilityInsurance",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R123": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:PossibleadditionalfuturecostsforcompliancewithCCRrequirements",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241114069 - Disclosure - Commitments and Contingencies - Legal Proceedings (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
     "shortName": "Commitments and Contingencies - Legal Proceedings (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:Amountspentunderenvironmentalagreements",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R124": {
     "firstAnchor": {
      "ancestors": [
       "tve:UnfundedloancommitmentsTableTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Unfundedloancommitmentdueinnexttwelvemonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241124070 - Disclosure - Commitments and Contingencies Unfunded loan commitments (Details)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails",
     "shortName": "Commitments and Contingencies Unfunded loan commitments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "tve:UnfundedloancommitmentsTableTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Unfundedloancommitmentdueinnexttwelvemonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R125": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:RemainingAppropriationInvestment",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241154071 - Disclosure - Related Parties Related Parties (Details)",
     "role": "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails",
     "shortName": "Related Parties Related Parties (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "idd184ba964fb43f59ca30f25884b5b25_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:Revenues",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R126": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
       "us-gaap:QuarterlyFinancialInformationTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ica9792d0b9324768b4ffef9022ca6a77_D20200701-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:Revenues",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241184072 - Disclosure - Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details)",
     "role": "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationDetails",
     "shortName": "Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
       "us-gaap:QuarterlyFinancialInformationTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ica9792d0b9324768b4ffef9022ca6a77_D20200701-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:OperatingExpenses",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R127": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Otherrevenue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241264074 - Disclosure - Revenue (Details)",
     "role": "http://www.tva.gov/role/RevenueDetails",
     "shortName": "Revenue (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:Offsystemsales",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R128": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Electricrevenue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241274075 - Disclosure - Revenue Customer Type (Details)",
     "role": "http://www.tva.gov/role/RevenueCustomerTypeDetails",
     "shortName": "Revenue Customer Type (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "INF",
      "lang": "en-US",
      "name": "tve:PercentOfSalesOfElectricityToLPCs",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R129": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:NumberOfLPCsSignedLTA",
      "reportCount": 1,
      "unitRef": "units",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241284076 - Disclosure - Revenue Local Power Company Contracts (Details)",
     "role": "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails",
     "shortName": "Revenue Local Power Company Contracts (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentAndIntangibleAssetsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210191005 - Disclosure - Net Completed Plant",
     "role": "http://www.tva.gov/role/NetCompletedPlant",
     "shortName": "Net Completed Plant",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentAndIntangibleAssetsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R130": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Electricrevenue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241294077 - Disclosure - Revenue Energy Prepayment Obligations (Details)",
     "role": "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
     "shortName": "Revenue Energy Prepayment Obligations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:EnergyPrepaymentDiscount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R131": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "us-gaap:RevenueRecognitionIncentives",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Economicincentives",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241304078 - Disclosure - Revenue Economic Development Incentives (Details)",
     "role": "http://www.tva.gov/role/RevenueEconomicDevelopmentIncentivesDetails",
     "shortName": "Revenue Economic Development Incentives (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "us-gaap:RevenueRecognitionIncentives",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Economicincentives",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R132": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PlantRetirementAndAbandonmentPolicy",
       "tve:PlantClosuresTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Accelerateddepreciation",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241374080 - Disclosure - Plant Closures (Details)",
     "role": "http://www.tva.gov/role/PlantClosuresDetails",
     "shortName": "Plant Closures (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PlantRetirementAndAbandonmentPolicy",
       "tve:PlantClosuresTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ibfd54c412bfa434baf04181efa8fa2c3_D20191001-20200930",
      "decimals": null,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentDispositions",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R133": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "us-gaap:LeasesOfLesseeDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeaseRightOfUseAsset",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241404081 - Disclosure - Leases (Details)",
     "role": "http://www.tva.gov/role/LeasesDetails",
     "shortName": "Leases (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "us-gaap:LeasesOfLesseeDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:FinanceLeaseRightOfUseAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R134": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:AmountsRecognizedOnStatementsOfCashFlowsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:OperatingCashFlowsForOperatingLeases",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241414082 - Disclosure - Leases, SoCF (Details)",
     "role": "http://www.tva.gov/role/LeasesSoCFDetails",
     "shortName": "Leases, SoCF (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:AmountsRecognizedOnStatementsOfCashFlowsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:OperatingCashFlowsForOperatingLeases",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R135": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:WeightedAveragesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241424083 - Disclosure - Leases, Weighted Averages (Details)",
     "role": "http://www.tva.gov/role/LeasesWeightedAveragesDetails",
     "shortName": "Leases, Weighted Averages (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:WeightedAveragesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R136": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "241434084 - Disclosure - Leases, Future Minimum Payments (Details)",
     "role": "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails",
     "shortName": "Leases, Future Minimum Payments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:PresentValueOfFutureMinimumLeasePaymentsOperating",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210221006 - Disclosure - Other Long-Term Assets [Text Block]",
     "role": "http://www.tva.gov/role/OtherLongTermAssetsTextBlock",
     "shortName": "Other Long-Term Assets [Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210251007 - Disclosure - Regulatory Assets and Liabilities [Text Block]",
     "role": "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesTextBlock",
     "shortName": "Regulatory Assets and Liabilities [Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": null,
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210281008 - Disclosure - Asset Acquisitions and Business Combinations (Notes)",
     "role": "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsNotes",
     "shortName": "Asset Acquisitions and Business Combinations (Notes)",
     "subGroupType": "",
     "uniqueAnchor": null
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:VariableInterestEntityDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210311009 - Disclosure - Variable Interest Entities",
     "role": "http://www.tva.gov/role/VariableInterestEntities",
     "shortName": "Variable Interest Entities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:VariableInterestEntityDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherLiabilitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210351010 - Disclosure - Other Long-Term Liabilities",
     "role": "http://www.tva.gov/role/OtherLongTermLiabilities",
     "shortName": "Other Long-Term Liabilities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherLiabilitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AssetRetirementObligationDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210381011 - Disclosure - Asset Retirement Obligations",
     "role": "http://www.tva.gov/role/AssetRetirementObligations",
     "shortName": "Asset Retirement Obligations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AssetRetirementObligationDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Electricrevenue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100010002 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS",
     "role": "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
     "shortName": "CONSOLIDATED STATEMENTS OF OPERATIONS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:UtilitiesOperatingExpenseFuelUsed",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210421012 - Disclosure - Debt and Other Obligations",
     "role": "http://www.tva.gov/role/DebtandOtherObligations",
     "shortName": "Debt and Other Obligations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfReclassificationAmountTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210541013 - Disclosure - Accumulated Other Comprehensive Income (Loss)",
     "role": "http://www.tva.gov/role/AccumulatedOtherComprehensiveIncomeLoss",
     "shortName": "Accumulated Other Comprehensive Income (Loss)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfReclassificationAmountTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210571014 - Disclosure - Risk Management Activities and Derivative Transactions",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactions",
     "shortName": "Risk Management Activities and Derivative Transactions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210691015 - Disclosure - Fair Value Measurements",
     "role": "http://www.tva.gov/role/FairValueMeasurements",
     "shortName": "Fair Value Measurements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210761016 - Disclosure - Proprietary Capital (Text Block)",
     "role": "http://www.tva.gov/role/ProprietaryCapitalTextBlock",
     "shortName": "Proprietary Capital (Text Block)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherIncomeAndOtherExpenseDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210811017 - Disclosure - Other Income (Expense), Net",
     "role": "http://www.tva.gov/role/OtherIncomeExpenseNet",
     "shortName": "Other Income (Expense), Net",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherIncomeAndOtherExpenseDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "211131021 - Disclosure - Related Parties",
     "role": "http://www.tva.gov/role/RelatedParties",
     "shortName": "Related Parties",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:QuarterlyFinancialInformationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "211161022 - Disclosure - Unaudited Quarterly Financial Information",
     "role": "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformation",
     "shortName": "Unaudited Quarterly Financial Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:QuarterlyFinancialInformationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "211231024 - Disclosure - Revenue",
     "role": "http://www.tva.gov/role/Revenue",
     "shortName": "Revenue",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:PlantClosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "211341026 - Disclosure - Plant Closures [Text Block]",
     "role": "http://www.tva.gov/role/PlantClosuresTextBlock",
     "shortName": "Plant Closures [Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:PlantClosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100020003 - Statement - CONSOLIDATED BALANCE SHEETS",
     "role": "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
     "shortName": "CONSOLIDATED BALANCE SHEETS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:OtherAssetsCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LeasesOfLesseeDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "211381027 - Disclosure - Leases (Text Block)",
     "role": "http://www.tva.gov/role/LeasesTextBlock",
     "shortName": "Leases (Text Block)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LeasesOfLesseeDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "220022001 - Disclosure - Summary of Significant Accounting Policies [Policy Text Block]",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock",
     "shortName": "Summary of Significant Accounting Policies [Policy Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessDescriptionAndBasisOfPresentationTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfVariableInterestEntitiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "220322002 - Disclosure - Variable Interest Entities (Policies)",
     "role": "http://www.tva.gov/role/VariableInterestEntitiesPolicies",
     "shortName": "Variable Interest Entities (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfVariableInterestEntitiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AssetRetirementObligationsPolicy",
      "reportCount": 1,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "220392003 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Policies)",
     "role": "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsPolicies",
     "shortName": "Asset Retirement Obligations Asset Retirement Obligations (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": null
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:USTreasurypaymentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "220772004 - Disclosure - Proprietary Capital Payments to the U.S. Treasury (Policies)",
     "role": "http://www.tva.gov/role/ProprietaryCapitalPaymentstotheUSTreasuryPolicies",
     "shortName": "Proprietary Capital Payments to the U.S. Treasury (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:USTreasurypaymentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementPlansPolicy",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "220852005 - Disclosure - Benefit Plans Benefit Plans (Policies)",
     "role": "http://www.tva.gov/role/BenefitPlansBenefitPlansPolicies",
     "shortName": "Benefit Plans Benefit Plans (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementPlansPolicy",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueRecognitionPolicyTextBlock",
      "reportCount": 1,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "221242007 - Disclosure - Revenue (Policies)",
     "role": "http://www.tva.gov/role/RevenuePolicies",
     "shortName": "Revenue (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": null
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "tve:PlantClosuresTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PlantRetirementAndAbandonmentPolicy",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "221352008 - Disclosure - Property, Plant, and Equipment [Policy Text Block]",
     "role": "http://www.tva.gov/role/PropertyPlantandEquipmentPolicyTextBlock",
     "shortName": "Property, Plant, and Equipment [Policy Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "tve:PlantClosuresTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PlantRetirementAndAbandonmentPolicy",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:DepreciationRatesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230033001 - Disclosure - Summary of Significant Accounting Policies [Table Text Block]",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesTableTextBlock",
     "shortName": "Summary of Significant Accounting Policies [Table Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:DepreciationRatesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230143003 - Disclosure - Accounts Receivable, Net Accounts Receivable, Net (Tables)",
     "role": "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetTables",
     "shortName": "Accounts Receivable, Net Accounts Receivable, Net (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AmortizationOfRegulatoryAsset",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100030004 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS",
     "role": "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
     "shortName": "CONSOLIDATED STATEMENTS OF CASH FLOWS",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DepreciationAmortizationAndAccretionNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:InventoryDisclosureTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230173004 - Disclosure - Inventories, Net Inventories, Net (Tables)",
     "role": "http://www.tva.gov/role/InventoriesNetInventoriesNetTables",
     "shortName": "Inventories, Net Inventories, Net (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:InventoryDisclosureTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230203005 - Disclosure - Net Completed Plant Net Completed Plant (Tables)",
     "role": "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantTables",
     "shortName": "Net Completed Plant Net Completed Plant (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:OtherAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230233006 - Disclosure - Other Long-Term Assets Other Long-Term Assets (Tables)",
     "role": "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsTables",
     "shortName": "Other Long-Term Assets Other Long-Term Assets (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:OtherAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230263007 - Disclosure - Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)",
     "role": "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesTables",
     "shortName": "Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherNoncurrentLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230363010 - Disclosure - Other Long-Term Liabilities Other Long-Term Liabilities (Tables)",
     "role": "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesTables",
     "shortName": "Other Long-Term Liabilities Other Long-Term Liabilities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherNoncurrentLiabilitiesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAssetRetirementObligationsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230403011 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Tables)",
     "role": "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsTables",
     "shortName": "Asset Retirement Obligations Asset Retirement Obligations (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAssetRetirementObligationsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShortTermDebtTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230433012 - Disclosure - Debt and Other Obligations Debt and Other Obligations (Tables)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables",
     "shortName": "Debt and Other Obligations Debt and Other Obligations (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShortTermDebtTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230583014 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions (Tables)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230703015 - Disclosure - Fair Value Measurements (Tables)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsTables",
     "shortName": "Fair Value Measurements (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230783016 - Disclosure - Proprietary Capital (Tables)",
     "role": "http://www.tva.gov/role/ProprietaryCapitalTables",
     "shortName": "Proprietary Capital (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i20686a2aa2f141a18ba54a38957684b0_I20190930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:Balance",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100040005 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL",
     "role": "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
     "shortName": "CONSOLIDATED STATEMENTS OF CHANGES IN PROPRIETARY CAPITAL",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i0582117321da499d84a09968265e6175_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:OtherComprehensiveIncomeLossNetOfTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230823017 - Disclosure - Other Income (Expense), Net Other Income (Expense), Net (Tables)",
     "role": "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetTables",
     "shortName": "Other Income (Expense), Net Other Income (Expense), Net (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "230863019 - Disclosure - Benefit Plans Benefit Plans (Tables)",
     "role": "http://www.tva.gov/role/BenefitPlansBenefitPlansTables",
     "shortName": "Benefit Plans Benefit Plans (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:ScheduleofleaseleasebackfutureminimumpaymentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "231043020 - Disclosure - Commitments and Contingencies (Tables)",
     "role": "http://www.tva.gov/role/CommitmentsandContingenciesTables",
     "shortName": "Commitments and Contingencies (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:ScheduleofleaseleasebackfutureminimumpaymentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "231143021 - Disclosure - Related Parties Related Parties (Tables)",
     "role": "http://www.tva.gov/role/RelatedPartiesRelatedPartiesTables",
     "shortName": "Related Parties Related Parties (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRelatedPartyTransactionsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:QuarterlyFinancialInformationTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "231173022 - Disclosure - Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables)",
     "role": "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationTables",
     "shortName": "Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:QuarterlyFinancialInformationTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueRecognitionIncentives",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "231253024 - Disclosure - Revenue (Tables)",
     "role": "http://www.tva.gov/role/RevenueTables",
     "shortName": "Revenue (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueRecognitionIncentives",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:LeasesOfLesseeDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:AmountsRecognizedOnBalanceSheetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "231393027 - Disclosure - Leases (Table Text Block)",
     "role": "http://www.tva.gov/role/LeasesTableTextBlock",
     "shortName": "Leases (Table Text Block)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:LeasesOfLesseeDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "tve:AmountsRecognizedOnBalanceSheetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240044001 - Disclosure - Summary of Significant Accounting Policies - General (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails",
     "shortName": "Summary of Significant Accounting Policies - General (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:InventoryPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:RecordedCostForEmissionAllowancesGrantedByEnvironmentalProtectionAgency",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FinanceLeaseLiability",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240054002 - Disclosure - Summary of Significant Accounting Policies - Reclassificatons (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails",
     "shortName": "Summary of Significant Accounting Policies - Reclassificatons (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ia2da5717574e4986940d8ab921fa3a33_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NotesReceivableNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240064003 - Disclosure - Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails",
     "shortName": "Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:TradeAndOtherAccountsReceivablePolicy",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "lang": "en-US",
      "name": "tve:Periodoftimeforcustomerstofulfillpaymentarrangements",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
       "us-gaap:QuarterlyFinancialInformationTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100050006 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement",
     "role": "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement",
     "shortName": "CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:ComprehensiveIncomeNetOfTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:Depreciation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240074004 - Disclosure - Summary of Significant Accounting Policies - Property, Plant, and Equipment, and Depreciation (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails",
     "shortName": "Summary of Significant Accounting Policies - Property, Plant, and Equipment, and Depreciation (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:PropertyPlantAndEquipmentPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:Depreciation",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i73e7de57e9b348f5bac845403e8ddb7c_D20031001-20040930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncreaseDecreaseInDeferredRevenue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240084005 - Disclosure - Summary of Significant Accounting Policies - Energy Prepayment Obligations and Discounts on Sales (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
     "shortName": "Summary of Significant Accounting Policies - Energy Prepayment Obligations and Discounts on Sales (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i73e7de57e9b348f5bac845403e8ddb7c_D20031001-20040930",
      "decimals": null,
      "lang": "en-US",
      "name": "tve:PrepaymentPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:LesseeLeasesPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:FinanceLeaseUnderPPA",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240094006 - Disclosure - Summary of Significant Accounting Policies - Leases (Details)",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesLeasesDetails",
     "shortName": "Summary of Significant Accounting Policies - Leases (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:LesseeLeasesPolicyTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:FinanceLeaseUnderPPA",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "us-gaap:LeasesOfLesseeDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OperatingLeaseRightOfUseAsset",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240124007 - Disclosure - Impact of New Accounting Standards and Interpretations (Details)",
     "role": "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails",
     "shortName": "Impact of New Accounting Standards and Interpretations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsReceivableGrossCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240154008 - Disclosure - Accounts Receivable, Net Accounts Receivable, Net (Details)",
     "role": "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
     "shortName": "Accounts Receivable, Net Accounts Receivable, Net (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:OtherReceivablesGrossCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryRawMaterialsAndSupplies",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240184009 - Disclosure - Inventories, Net Inventories, Net (Details)",
     "role": "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails",
     "shortName": "Inventories, Net Inventories, Net (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryRawMaterialsAndSupplies",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PropertyPlantAndEquipmentGross",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240214010 - Disclosure - Net Completed Plant Net Completed Plant (Details)",
     "role": "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
     "shortName": "Net Completed Plant Net Completed Plant (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:RevisionsToAssetRetirementCosts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240244011 - Disclosure - Other Long-Term Assets Other Long-Term Assets (Details)",
     "role": "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
     "shortName": "Other Long-Term Assets Other Long-Term Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfOtherAssetsNoncurrentTextBlock",
       "us-gaap:OtherAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:PrepaidExpenseNoncurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RegulatoryLiabilityNoncurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240274012 - Disclosure - Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Details)",
     "role": "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
     "shortName": "Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i77d25e0c443d4a2d9feec824fb2dfd19_D20171001-20180930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:AcceleratedAmortizationofDeferredNuclearGeneratingUnitsandTrainingCosts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240304013 - Disclosure - Asset Acquisitions and Business Combinations (Details)",
     "role": "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails",
     "shortName": "Asset Acquisitions and Business Combinations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashFlowSupplementalDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "110061018 - Statement - Supplemental Cash Flow Information",
     "role": "http://www.tva.gov/role/SupplementalCashFlowInformation",
     "shortName": "Supplemental Cash Flow Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashFlowSupplementalDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherLongTermDebtCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240344014 - Disclosure - Variable Interest Entities (Details)",
     "role": "http://www.tva.gov/role/VariableInterestEntitiesDetails",
     "shortName": "Variable Interest Entities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "3",
      "lang": "en-US",
      "name": "tve:Financialinstrumentssubjecttomandatoryredemptioninterestratestatedpercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestRateDerivativeLiabilitiesAtFairValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240374015 - Disclosure - Other Long-Term Liabilities Other Long-Term Liabilities (Details)",
     "role": "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
     "shortName": "Other Long-Term Liabilities Other Long-Term Liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:Changeininterestrateswapliabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AssetRetirementObligationPeriodIncreaseDecrease",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240414016 - Disclosure - Asset Retirement Obligations Asset Retirement Obligations (Details)",
     "role": "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
     "shortName": "Asset Retirement Obligations Asset Retirement Obligations (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AssetRetirementObligationPeriodIncreaseDecrease",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "if64f57d0ec8047d2a9c1f5ffe4ef5020_I20120117",
      "decimals": "3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentInterestRateStatedPercentage",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240444017 - Disclosure - Debt and Other Obligations Debt and Other Obligations - General (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - General (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-8",
      "lang": "en-US",
      "name": "tve:DebtCeiling",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ia2da5717574e4986940d8ab921fa3a33_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240454018 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240464019 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Secured Notes of SPEs (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Secured Notes of SPEs (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i3efda9d50eb64dbaaf39a368de7129a9_I20011114",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ShortTermBorrowings",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240474020 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Short-Term Debt (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:ShorttermBorrowingsGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R77": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i20686a2aa2f141a18ba54a38957684b0_I20190930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:AmountOfRedeemableBondIssuesOutstanding",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240484021 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i20686a2aa2f141a18ba54a38957684b0_I20190930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:AmountOfRedeemableBondIssuesOutstanding",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R78": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ProceedsFromIssuanceOfUnsecuredDebt",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240494022 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:DebtSecuritiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R79": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "if64f57d0ec8047d2a9c1f5ffe4ef5020_I20120117",
      "decimals": "3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentInterestRateStatedPercentage",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240504023 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i20686a2aa2f141a18ba54a38957684b0_I20190930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:LongTermDebtCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:InterestPaidNet",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestPaid",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "140084046 - Statement - Supplemental Cash Flow Information",
     "role": "http://www.tva.gov/role/SupplementalCashFlowInformation_2",
     "shortName": "Supplemental Cash Flow Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:InterestPaidNet",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestPaid",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R80": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240514024 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R81": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240524025 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Credit Facility Agreements (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Credit Facility Agreements (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ib448b250d17443cf8f2c461679250810_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R82": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:CtAndQteOutstandingLeasebackObligation",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240534026 - Disclosure - Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details)",
     "role": "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails",
     "shortName": "Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R83": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240564027 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details)",
     "role": "http://www.tva.gov/role/AccumulatedOtherComprehensiveIncomeLossDetails",
     "shortName": "Accumulated Other Comprehensive Income (Loss) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R84": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestRateDerivativeLiabilitiesAtFairValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240594028 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Receive Hedge Accounting Treatment (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Receive Hedge Accounting Treatment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "0",
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R85": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:UnrealizedGainLossOnDerivatives",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240604029 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:UnrealizedGainLossOnDerivatives",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R86": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeFairValueOfDerivativeLiability",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240614030 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i0fe246079b7a4ddf876f09d35e457583_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DerivativeFairValueOfDerivativeNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R87": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:NumberOfBritishPoundStrelingDenominatedBondTransactions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "bond_issues",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240624031 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Currency Swaps Outstanding (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Currency Swaps Outstanding (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "tve:NumberOfBritishPoundStrelingDenominatedBondTransactions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "bond_issues",
      "xsiNil": "false"
     }
    },
    "R88": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
       "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsReceivableGrossCurrent",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240644033 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Counterparty Credit Risk (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Counterparty Credit Risk (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i21524ae3cf0d4d7f8fb933cca267c8a7_D20191001-20200930",
      "decimals": "0",
      "lang": "en-US",
      "name": "tve:Numberofcustomersthatrepresentthepercentofsales",
      "reportCount": 1,
      "unique": true,
      "unitRef": "customers",
      "xsiNil": "false"
     }
    },
    "R89": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLineOfCreditFacilitiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i360a1d9420be4988ab96595d0c9a1f2d_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LettersOfCreditOutstandingAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240654034 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Assets (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i1c96cc98daea480fabee1e8859aedaa1_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DerivativeFairValueOfDerivativeAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "210011001 - Disclosure - Summary of Significant Accounting Policies [Text Block]",
     "role": "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesTextBlock",
     "shortName": "Summary of Significant Accounting Policies [Text Block]",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R90": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeFairValueOfDerivativeLiability",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240664035 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Liabilities (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Liabilities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i20686a2aa2f141a18ba54a38957684b0_I20190930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "us-gaap:DerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R91": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "tve:ForwardContractDerivativeAssetatFairValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240674036 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Other Derivative Instruments (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Other Derivative Instruments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R92": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AdditionalCollateralAggregateFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240684037 - Disclosure - Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Collateral (Details)",
     "role": "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
     "shortName": "Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Collateral (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AdditionalCollateralAggregateFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R93": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermInvestments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240714038 - Disclosure - Fair Value Measurements - Investments (Details)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails",
     "shortName": "Fair Value Measurements - Investments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-8",
      "lang": "en-US",
      "name": "tve:NuclearDecommissioningFundInvestmentsFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R94": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeCreditRiskValuationAdjustmentDerivativeAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240724039 - Disclosure - Fair Value Measurements - Nonperformance Risk (Details)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails",
     "shortName": "Fair Value Measurements - Nonperformance Risk (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeCreditRiskValuationAdjustmentDerivativeAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R95": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TradingSecuritiesEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240734040 - Disclosure - Fair Value Measurements - Fair Value Measurements (Details)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
     "shortName": "Fair Value Measurements - Fair Value Measurements (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TradingSecuritiesEquity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R96": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:FairValueassetsandliabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240744041 - Disclosure - Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
     "shortName": "Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "tve:FairValueassetsandliabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R97": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240754042 - Disclosure - Fair Value Measurements - Estimated Values of Financial Instruments (Details)",
     "role": "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
     "shortName": "Fair Value Measurements - Estimated Values of Financial Instruments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "ix:continuation",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-6",
      "lang": "en-US",
      "name": "tve:UnfundedLoanCommitments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R98": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2af8e966de5848669194afc15ec14a8c_I20200930",
      "decimals": "-8",
      "first": true,
      "lang": "en-US",
      "name": "tve:AmountOfAppropriationInvestmentThatMustBeRepaid",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240794043 - Disclosure - Proprietary Capital (Details)",
     "role": "http://www.tva.gov/role/ProprietaryCapitalDetails",
     "shortName": "Proprietary Capital (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "tve:USTreasurypaymentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i2a2482339536420ba0b5388a663bbe20_I20180930",
      "decimals": "4",
      "lang": "en-US",
      "name": "tve:ComputedAverageInterestRatePayable",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R99": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "i9dce3ea726ca411e9e2eaff745d1592d_D20191001-20200930",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "240804044 - Disclosure - Proprietary Capital - Accumulated Other Comprehensive Income (Loss) (Details)",
     "role": "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
     "shortName": "Proprietary Capital - Accumulated Other Comprehensive Income (Loss) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R9999": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "tve-20200930.htm",
      "contextRef": "ie4d63e17e2484836a2309bd020b9e058_I20130809",
      "decimals": "5",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentInterestRateStatedPercentage",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "",
     "isDefault": "false",
     "longName": "Uncategorized Items - tve-20200930.htm",
     "role": "http://xbrl.sec.gov/role/uncategorizedFacts",
     "shortName": "Uncategorized Items - tve-20200930.htm",
     "subGroupType": "",
     "uniqueAnchor": null
    }
   },
   "segmentCount": 206,
   "tag": {
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CurrentFiscalYearEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "End date of current fiscal year in the format --MM-DD.",
        "label": "Current Fiscal Year End Date",
        "terseLabel": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of the document as assigned by the filer, corresponding to SEC document naming convention standards.",
        "label": "Document [Domain]",
        "terseLabel": "Document [Domain]"
       }
      }
     },
     "localname": "DocumentDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus",
        "terseLabel": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus",
        "terseLabel": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentInformationDocumentAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.",
        "label": "Document Information, Document [Axis]",
        "terseLabel": "Document Information, Document [Axis]"
       }
      }
     },
     "localname": "DocumentInformationDocumentAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Document Information [Line Items]",
        "terseLabel": "Document Information [Line Items]"
       }
      }
     },
     "localname": "DocumentInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentInformationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package.",
        "label": "Document Information [Table]",
        "terseLabel": "Document Information [Table]"
       }
      }
     },
     "localname": "DocumentInformationTable",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r734"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report",
        "terseLabel": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock, Shares Outstanding",
        "terseLabel": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status",
        "terseLabel": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category",
        "terseLabel": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r736"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current",
        "terseLabel": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityPublicFloat": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.",
        "label": "Entity Public Float",
        "terseLabel": "Entity Public Float"
       }
      }
     },
     "localname": "EntityPublicFloat",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "monetaryItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company",
        "terseLabel": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business",
        "terseLabel": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r735"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_EntityVoluntaryFilers": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.",
        "label": "Entity Voluntary Filers",
        "terseLabel": "Entity Voluntary Filers"
       }
      }
     },
     "localname": "EntityVoluntaryFilers",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityWellKnownSeasonedIssuer": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.",
        "label": "Entity Well-known Seasoned Issuer",
        "terseLabel": "Entity Well-known Seasoned Issuer"
       }
      }
     },
     "localname": "EntityWellKnownSeasonedIssuer",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_IcfrAuditorAttestationFlag": {
     "auth_ref": [
      "r730",
      "r731",
      "r733"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "ICFR Auditor Attestation Flag",
        "terseLabel": "ICFR Auditor Attestation Flag"
       }
      }
     },
     "localname": "IcfrAuditorAttestationFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DEIDocument"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "srt_AffiliatedEntityMember": {
     "auth_ref": [
      "r379",
      "r576",
      "r577",
      "r579",
      "r711",
      "r739"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An affiliate is a party that, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity.",
        "label": "Affiliated Entity [Member]",
        "terseLabel": "Affiliated Entity",
        "verboseLabel": "Related Party Transactions"
       }
      }
     },
     "localname": "AffiliatedEntityMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ConsolidatedEntitiesAxis": {
     "auth_ref": [
      "r458",
      "r459",
      "r462",
      "r463",
      "r711",
      "r739"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by consolidated entity or group of entities.",
        "label": "Consolidated Entities [Axis]",
        "terseLabel": "Consolidated Entities [Axis]"
       }
      }
     },
     "localname": "ConsolidatedEntitiesAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ConsolidatedEntitiesDomain": {
     "auth_ref": [
      "r458",
      "r459",
      "r462",
      "r463"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Entity or group of entities consolidated into reporting entity.",
        "label": "Consolidated Entities [Domain]",
        "terseLabel": "Consolidated Entities [Domain]"
       }
      }
     },
     "localname": "ConsolidatedEntitiesDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_LitigationCaseAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of judicial proceeding, alternative dispute resolution or claim.",
        "label": "Litigation Case [Axis]",
        "terseLabel": "Legal Proceedings"
       }
      }
     },
     "localname": "LitigationCaseAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_LitigationCaseTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Judicial proceeding, alternative dispute resolution or claim. For example, but not limited to, name of case, category of litigation, or other differentiating information.",
        "label": "Litigation Case [Domain]",
        "terseLabel": "Legal Proceedings"
       }
      }
     },
     "localname": "LitigationCaseTypeDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MajorCustomersAxis": {
     "auth_ref": [
      "r216",
      "r307",
      "r311",
      "r665"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by name or description of a single external customer or a group of external customers.",
        "label": "Customer [Axis]",
        "terseLabel": "Customer [Axis]"
       }
      }
     },
     "localname": "MajorCustomersAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [
      "r416",
      "r422",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r600",
      "r663",
      "r666"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Upper limit of the provided range.",
        "label": "Maximum [Member]",
        "terseLabel": "Maximum"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [
      "r416",
      "r422",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r600",
      "r663",
      "r666"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lower limit of the provided range.",
        "label": "Minimum [Member]",
        "terseLabel": "Minimum"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_NameOfMajorCustomerDomain": {
     "auth_ref": [
      "r216",
      "r307",
      "r311",
      "r665"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Single external customer or group of external customers.",
        "label": "Customer [Domain]",
        "terseLabel": "Customer [Domain]"
       }
      }
     },
     "localname": "NameOfMajorCustomerDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_NaturalGasReservesMember": {
     "auth_ref": [
      "r618",
      "r732"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Natural gas composed primarily of methane gas, excluding liquid or condensate natural gas.",
        "label": "Natural Gas [Member]",
        "verboseLabel": "Natural Gas Contract Derivatives"
       }
      }
     },
     "localname": "NaturalGasReservesMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_PayablesToCustomers": {
     "auth_ref": [
      "r741"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount payable to customer by broker-dealer.",
        "label": "Broker-Dealer, Payable to Customer",
        "terseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "PayablesToCustomers",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [
      "r351",
      "r416",
      "r422",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r600",
      "r663",
      "r666"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.",
        "label": "Statistical Measurement [Axis]",
        "terseLabel": "Statistical Measurement [Axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [
      "r351",
      "r416",
      "r422",
      "r591",
      "r592",
      "r593",
      "r594",
      "r595",
      "r596",
      "r600",
      "r663",
      "r666"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.",
        "label": "Statistical Measurement [Domain]",
        "terseLabel": "Range"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ScenarioForecastMember": {
     "auth_ref": [
      "r417",
      "r737"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information reported for future period.",
        "label": "Forecast [Member]",
        "terseLabel": "Scenario, Forecast"
       }
      }
     },
     "localname": "ScenarioForecastMember",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ScenarioUnspecifiedDomain": {
     "auth_ref": [
      "r417"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Scenario reported, distinguishing information from actual fact. Includes, but is not limited to, pro forma and forecast. Excludes actual facts.",
        "label": "Scenario [Domain]",
        "terseLabel": "Scenario, Unspecified"
       }
      }
     },
     "localname": "ScenarioUnspecifiedDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_SegmentGeographicalDomain": {
     "auth_ref": [
      "r214",
      "r215",
      "r307",
      "r310",
      "r664",
      "r702",
      "r703",
      "r704",
      "r705",
      "r706",
      "r707",
      "r708",
      "r709"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Geographical area.",
        "label": "Geographical [Domain]",
        "terseLabel": "Geographical [Domain]"
       }
      }
     },
     "localname": "SegmentGeographicalDomain",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_StatementGeographicalAxis": {
     "auth_ref": [
      "r214",
      "r215",
      "r307",
      "r310",
      "r664",
      "r697",
      "r702",
      "r703",
      "r704",
      "r705",
      "r706",
      "r707",
      "r708",
      "r709",
      "r710",
      "r738",
      "r740"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by geographical components.",
        "label": "Geographical [Axis]",
        "terseLabel": "Geographical [Axis]"
       }
      }
     },
     "localname": "StatementGeographicalAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_StatementScenarioAxis": {
     "auth_ref": [
      "r274",
      "r417",
      "r586"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by scenario reported, distinguishing information from actual fact. Includes, but is not limited to, pro forma and forecast. Excludes actual facts.",
        "label": "Scenario [Axis]",
        "terseLabel": "Scenario [Axis]"
       }
      }
     },
     "localname": "StatementScenarioAxis",
     "nsuri": "http://fasb.org/srt/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "stpr_AL": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "ALABAMA",
        "terseLabel": "ALABAMA"
       }
      }
     },
     "localname": "AL",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_GA": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "GEORGIA",
        "terseLabel": "GEORGIA"
       }
      }
     },
     "localname": "GA",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_KY": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "KENTUCKY",
        "terseLabel": "KENTUCKY"
       }
      }
     },
     "localname": "KY",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_MS": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "MISSISSIPPI",
        "terseLabel": "MISSISSIPPI"
       }
      }
     },
     "localname": "MS",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_NC": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "NORTH CAROLINA",
        "terseLabel": "NORTH CAROLINA"
       }
      }
     },
     "localname": "NC",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_TN": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "TENNESSEE",
        "terseLabel": "TENNESSEE"
       }
      }
     },
     "localname": "TN",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "stpr_VA": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "VIRGINIA",
        "terseLabel": "VIRGINIA"
       }
      }
     },
     "localname": "VA",
     "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A10BillionNotionalInterestRateSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period.",
        "label": "$1.0 billion notional interest rate swap [Member]",
        "terseLabel": "$1.0 billion notional interest rate swap"
       }
      }
     },
     "localname": "A10BillionNotionalInterestRateSwapMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A10yearcontractarrangementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "10-year contract arrangement [Member]",
        "label": "10-year contract arrangement [Member]",
        "terseLabel": "10-year contract arrangement [Member]"
       }
      }
     },
     "localname": "A10yearcontractarrangementMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A150MillionSterlingCurrencySwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Swap involving the exchange of principal and interest in one currency for another currency.",
        "label": "150 million Sterling currency swap [Member]",
        "terseLabel": "150 million Sterling currency swap"
       }
      }
     },
     "localname": "A150MillionSterlingCurrencySwapMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A1995SeriesBMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "1995 Series B",
        "label": "1995 Series B [Member]",
        "terseLabel": "1995 Series B"
       }
      }
     },
     "localname": "A1995SeriesBMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A1997SeriesEMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "1997 Series E [Member]",
        "label": "1997 Series E [Member]",
        "terseLabel": "1997 Series E [Member]"
       }
      }
     },
     "localname": "A1997SeriesEMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A1999CurrencySwapContractMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "1999 Currency Swap Contract",
        "label": "1999 Currency Swap Contract [Member]",
        "terseLabel": "1999 Currency Swap Contract"
       }
      }
     },
     "localname": "A1999CurrencySwapContractMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2001CurrencySwapContractMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2001 Currency Swap Contract",
        "label": "2001 Currency Swap Contract [Member]",
        "terseLabel": "2001 Currency Swap Contract"
       }
      }
     },
     "localname": "A2001CurrencySwapContractMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2001SeriesDMemberDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2001 Series D [Member] [Domain]",
        "label": "2001 Series D [Member] [Domain]",
        "terseLabel": "2001 Series D"
       }
      }
     },
     "localname": "A2001SeriesDMemberDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2003CurrencySwapContractMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2003 Currency Swap Contract",
        "label": "2003 Currency Swap Contract [Member]",
        "terseLabel": "2003 Currency Swap Contract"
       }
      }
     },
     "localname": "A2003CurrencySwapContractMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2007SeriesAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2007 Series A [Member]",
        "label": "2007 Series A [Member]",
        "terseLabel": "2007 Series A"
       }
      }
     },
     "localname": "A2007SeriesAMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2008SeriesBMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2008 Series B [Domain]",
        "label": "2008 Series B [Member]",
        "terseLabel": "2008 Series B [Member]"
       }
      }
     },
     "localname": "A2008SeriesBMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2009SeriesBMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2009 Series B [Member]",
        "label": "2009 Series B [Member]",
        "terseLabel": "2009 Series B"
       }
      }
     },
     "localname": "A2009SeriesBMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2009SeriesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2009 Series A [Member]",
        "label": "2009 Series A [Member]",
        "terseLabel": "2009 Series A"
       }
      }
     },
     "localname": "A2009SeriesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2013SeriesAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2013 Series A [Member]",
        "label": "2013 Series A [Member]",
        "terseLabel": "2013 Series A [Member]"
       }
      }
     },
     "localname": "A2013SeriesAMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2017SeriesAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2017 Series A [Member]",
        "label": "2017 Series A [Member]",
        "terseLabel": "2017 Series A"
       }
      }
     },
     "localname": "A2017SeriesAMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2018IssueMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2018 Issue [Member]",
        "label": "2018 Issue [Member]",
        "terseLabel": "2018 Issue [Member]"
       }
      }
     },
     "localname": "A2018IssueMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A2020SeriesAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "2020 Series A",
        "label": "2020 Series A [Member]",
        "terseLabel": "2020 Series A"
       }
      }
     },
     "localname": "A2020SeriesAMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A20yearcontractarrangementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "20-year contract arrangement [Member]",
        "label": "20-year contract arrangement [Member]",
        "terseLabel": "20-year contract arrangement [Member]"
       }
      }
     },
     "localname": "A20yearcontractarrangementMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A250MillionSterlingCurrencySwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Swap involving the exchange of principal and interest in one currency for another currency.",
        "label": "250 million Sterling currency swap [Member]",
        "terseLabel": "250 million Sterling currency swap"
       }
      }
     },
     "localname": "A250MillionSterlingCurrencySwapMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A42MillionNotionalInterestRateSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period.",
        "label": "$42 million notional interest rate swap [Member]",
        "terseLabel": "$42 million notional interest rate swap"
       }
      }
     },
     "localname": "A42MillionNotionalInterestRateSwapMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A5yearcontractarrangementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "5-year contract arrangement [Member]",
        "label": "5-year contract arrangement [Member]",
        "terseLabel": "5-year contract arrangement [Member]"
       }
      }
     },
     "localname": "A5yearcontractarrangementMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A72016BusinessCombinationMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "7/20/16 Business Combination [Member]",
        "label": "7/20/16 Business Combination [Member]",
        "terseLabel": "7/20/16 Business Combination"
       }
      }
     },
     "localname": "A72016BusinessCombinationMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591300Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591300 [Member]",
        "label": "880591300 [Member]",
        "terseLabel": "880591300"
       }
      }
     },
     "localname": "A880591300Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591409Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591409 [Member]",
        "label": "880591409 [Member]",
        "terseLabel": "880591409"
       }
      }
     },
     "localname": "A880591409Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Cf7Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CF7 [Member]",
        "label": "880591CF7 [Member]",
        "terseLabel": "880591CF7"
       }
      }
     },
     "localname": "A880591Cf7Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Cj9Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CJ9 [Member]",
        "label": "880591CJ9 [Member]",
        "terseLabel": "880591CJ9"
       }
      }
     },
     "localname": "A880591Cj9Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ck6Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CK6 [Member]",
        "label": "880591CK6 [Member]",
        "terseLabel": "880591CK6"
       }
      }
     },
     "localname": "A880591Ck6Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Cp5Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CP5 [Member]",
        "label": "880591CP5 [Member]",
        "terseLabel": "880591CP5"
       }
      }
     },
     "localname": "A880591Cp5Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Cs9Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CS9 [Member]",
        "label": "880591CS9 [Member]",
        "terseLabel": "880591CS9"
       }
      }
     },
     "localname": "A880591Cs9Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Cu4Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591CU4 [Member]",
        "label": "880591CU4 [Member]",
        "terseLabel": "880591CU4"
       }
      }
     },
     "localname": "A880591Cu4Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dc3Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DC3 [Member]",
        "label": "880591DC3 [Member]",
        "terseLabel": "880591DC3"
       }
      }
     },
     "localname": "A880591Dc3Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dm1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DM1 [Member]",
        "label": "880591DM1 [Member]",
        "terseLabel": "880591DM1"
       }
      }
     },
     "localname": "A880591Dm1Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dp4Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DP4 [Member]",
        "label": "880591DP4 [Member]",
        "terseLabel": "880591DP4"
       }
      }
     },
     "localname": "A880591Dp4Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ds8Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DS8 [Member]",
        "label": "880591DS8 [Member]",
        "terseLabel": "880591DS8"
       }
      }
     },
     "localname": "A880591Ds8Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Du3Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DU3 [Member]",
        "label": "880591DU3 [Member]",
        "terseLabel": "880591DU3"
       }
      }
     },
     "localname": "A880591Du3Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dv1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DV1 [Member]",
        "label": "880591DV1 [Member]",
        "terseLabel": "880591DV1"
       }
      }
     },
     "localname": "A880591Dv1Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dx7Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DX7 [Member]",
        "label": "880591DX7 [Member]",
        "terseLabel": "880591DX7"
       }
      }
     },
     "localname": "A880591Dx7Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Dz2Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591DZ2 [Member]",
        "label": "880591DZ2 [Member]",
        "terseLabel": "880591DZ2"
       }
      }
     },
     "localname": "A880591Dz2Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EF5121520Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 (12.15.20)",
        "label": "880591EF5 (12.15.20) [Member]",
        "terseLabel": "880591EF5 (12.15.20)"
       }
      }
     },
     "localname": "A880591EF5121520Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EF5123120Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 (12/31/20)",
        "label": "880591EF5 (12/31/20) [Member]",
        "terseLabel": "880591EF5 (12/31/20)"
       }
      }
     },
     "localname": "A880591EF5123120Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EF56152019Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 (6/15/2019) [Member]",
        "label": "880591EF5 (6/15/2019) [Member]",
        "terseLabel": "880591EF5 (6/15/2018)"
       }
      }
     },
     "localname": "A880591EF56152019Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EF56152021": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 (6/15/2021)",
        "label": "880591EF5 (6/15/2021)",
        "terseLabel": "880591EF5 (6/15/2021)"
       }
      }
     },
     "localname": "A880591EF56152021",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_A880591EF561521Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 (6.15.21)",
        "label": "880591EF5 (6.15.21) [Member]",
        "terseLabel": "880591EF5 (6.15.21)"
       }
      }
     },
     "localname": "A880591EF561521Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EP3Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EP3 [Member]",
        "label": "880591EP3 [Member]",
        "terseLabel": "880591EP3"
       }
      }
     },
     "localname": "A880591EP3Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EQ1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EQ1 [Member]",
        "label": "880591EQ1 [Member]",
        "terseLabel": "880591EQ1"
       }
      }
     },
     "localname": "A880591EQ1Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591ER9Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591ER9 [Member]",
        "label": "880591ER9 [Member]",
        "terseLabel": "880591ER9"
       }
      }
     },
     "localname": "A880591ER9Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591ES7Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591ES7 [Member]",
        "label": "880591ES7 [Member]",
        "terseLabel": "880591ES7"
       }
      }
     },
     "localname": "A880591ES7Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EU26Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EU26 [Member]",
        "label": "880591EU26 [Member]",
        "terseLabel": "880591EU26"
       }
      }
     },
     "localname": "A880591EU26Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EU2Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EU2 [Member]",
        "label": "880591EU2 [Member]",
        "terseLabel": "880591EU2 [Member]"
       }
      }
     },
     "localname": "A880591EU2Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EV0Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EV0 [Member]",
        "label": "880591EV0 [Member]",
        "terseLabel": "880591EV0 [Member]"
       }
      }
     },
     "localname": "A880591EV0Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591EW8Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EW8",
        "label": "880591EW8 [Member]",
        "terseLabel": "880591EW8 [Member]"
       }
      }
     },
     "localname": "A880591EW8Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ea6Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EA6 [Member]",
        "label": "880591EA6 [Member]",
        "terseLabel": "880591EA6"
       }
      }
     },
     "localname": "A880591Ea6Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Eb4Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EB4 [Member]",
        "label": "880591EB4 [Member]",
        "terseLabel": "880591EB4"
       }
      }
     },
     "localname": "A880591Eb4Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ec2Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EC2 [Member]",
        "label": "880591EC2 [Member]",
        "terseLabel": "880591EC2"
       }
      }
     },
     "localname": "A880591Ec2Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ed0Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591ED0 [Member]",
        "label": "880591ED0 [Member]",
        "terseLabel": "880591ED0"
       }
      }
     },
     "localname": "A880591Ed0Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ef5Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EF5 [Member]",
        "label": "880591EF5 [Member]",
        "terseLabel": "880591EF5"
       }
      }
     },
     "localname": "A880591Ef5Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Eh1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EH1 [Member]",
        "label": "880591EH1 [Member]",
        "terseLabel": "880591EH1"
       }
      }
     },
     "localname": "A880591Eh1Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591Ej7Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EJ7 [Member]",
        "label": "880591EJ7 [Member]",
        "terseLabel": "880591EJ7"
       }
      }
     },
     "localname": "A880591Ej7Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591El2Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EL2 [Member]",
        "label": "880591EL2 [Member]",
        "terseLabel": "880591EL2"
       }
      }
     },
     "localname": "A880591El2Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A880591En8Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "880591EN8 [Member]",
        "label": "880591EN8 [Member]",
        "terseLabel": "880591EN8"
       }
      }
     },
     "localname": "A880591En8Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A88059TEL15152018Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "88059TEL1 (5/15/2018) [Member]",
        "label": "88059TEL1 (5/15/2018) [Member]",
        "terseLabel": "88059TEL1 (5/15/2018)"
       }
      }
     },
     "localname": "A88059TEL15152018Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A88059TFS5Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "88059TFS5 [Member]",
        "label": "88059TFS5 [Member]",
        "terseLabel": "88059TFS5"
       }
      }
     },
     "localname": "A88059TFS5Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A88059Tel1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "88059TEL1 [Member]",
        "label": "88059TEL1 [Member]",
        "terseLabel": "88059TEL1"
       }
      }
     },
     "localname": "A88059Tel1Member",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_A92017BusinessCombinationMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "9/20/17 Business Combination [Member]",
        "label": "9/20/17 Business Combination [Member]",
        "terseLabel": "9/20/17 Business Combination"
       }
      }
     },
     "localname": "A92017BusinessCombinationMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_AcceleratedAmortizationofDeferredNuclearGeneratingUnitsandTrainingCosts": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of Accelerated Amortization of Deferred Nuclear Generating Units and Training Costs that was taken during the fiscal year.",
        "label": "Accelerated Amortization of Deferred Nuclear Generating Units and Training Costs",
        "terseLabel": "Accelerated Amortization of Deferred Nuclear Generating Units and Training Costs"
       }
      }
     },
     "localname": "AcceleratedAmortizationofDeferredNuclearGeneratingUnitsandTrainingCosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Accelerateddepreciation": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accelerated depreciation",
        "label": "Accelerated depreciation",
        "terseLabel": "Accelerated depreciation"
       }
      }
     },
     "localname": "Accelerateddepreciation",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AcceleratedrecoveryforKingstonashspill": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accelerated recovery for Kingston ash spill",
        "label": "Accelerated recovery for Kingston ash spill",
        "terseLabel": "Accelerated recovery for Kingston ash spill"
       }
      }
     },
     "localname": "AcceleratedrecoveryforKingstonashspill",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AccountsreceivablefromDOE": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounts receivable",
        "label": "Accounts receivable from DOE",
        "terseLabel": "Accounts receivable from DOE"
       }
      }
     },
     "localname": "AccountsreceivablefromDOE",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AccretionRecordedAsRegulatoryAsset": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of accretion recorded as a regulatory asset during the period.",
        "label": "Accretion Recorded as Regulatory Asset",
        "terseLabel": "Accretion (recorded as regulatory asset)"
       }
      }
     },
     "localname": "AccretionRecordedAsRegulatoryAsset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AccumulatedOtherComprehensiveIncomeLossActivityTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated Other Comprehensive Income (Loss) Activity [Table]",
        "label": "Accumulated Other Comprehensive Income (Loss) Activity [Table]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) Activity"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossActivityTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ActuarialAssumptionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assumptions Used and Health Care Cost Trend Rates [Abstract]",
        "label": "Actuarial Assumptions [Abstract]",
        "terseLabel": "Actuarial Assumptions [Abstract]"
       }
      }
     },
     "localname": "ActuarialAssumptionsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_ActuarialassumptionCOLA": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Actuarial assumption COLA",
        "label": "Actuarial assumption COLA",
        "terseLabel": "Actuarial assumption COLA"
       }
      }
     },
     "localname": "ActuarialassumptionCOLA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AdditionalAcceleratedAmortizationDeferredNuclearGeneratingUnits": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Additional Accelerated Amortization, Deferred Nuclear Generating Units",
        "label": "Additional Accelerated Amortization, Deferred Nuclear Generating Units",
        "terseLabel": "Additional Accelerated Amortization, Deferred Nuclear Generating Units"
       }
      }
     },
     "localname": "AdditionalAcceleratedAmortizationDeferredNuclearGeneratingUnits",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AdditionalAcceleratedAmortizationNuclearTrainingCosts": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Additional Accelerated Amortization, Nuclear Training Costs",
        "label": "Additional Accelerated Amortization, Nuclear Training Costs",
        "terseLabel": "Additional Accelerated Amortization, Nuclear Training Costs"
       }
      }
     },
     "localname": "AdditionalAcceleratedAmortizationNuclearTrainingCosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AfudcMinimumTotalProjectCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest on funds invested in capital projects has been capitalized only for projects with (1) an expected total project cost of $1.0 billion or more, and (2) an estimated construction period of at least three years in duration.",
        "label": "AFUDC minimum total project cost",
        "terseLabel": "AFUDC minimum total project cost"
       }
      }
     },
     "localname": "AfudcMinimumTotalProjectCost",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AgeThresholdforChangestoCOLAChangesforCashBalancePlan": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Age Threshold for Changes to COLA Related to 2016 Amendments to TVA Pension Plan",
        "label": "Age Threshold for Changes to COLA Changes for Cash Balance Plan",
        "terseLabel": "Age Threshold for Changes to COLA Changes for Cash Balance Plan"
       }
      }
     },
     "localname": "AgeThresholdforChangestoCOLAChangesforCashBalancePlan",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_AllenEastAROincreasedecrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Allen East ARO increase (decrease)",
        "label": "Allen East ARO increase (decrease)",
        "terseLabel": "Allen East ARO increase (decrease)"
       }
      }
     },
     "localname": "AllenEastAROincreasedecrease",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AllenFossilPlantMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Allen Fossil Plant",
        "label": "Allen Fossil Plant [Member]",
        "terseLabel": "Allen Fossil Plant [Member]"
       }
      }
     },
     "localname": "AllenFossilPlantMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_AllenWestAROincrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Allen West ARO increase",
        "label": "Allen West ARO increase",
        "terseLabel": "Allen West ARO increase"
       }
      }
     },
     "localname": "AllenWestAROincrease",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmortizationPeriodforChangeinBenefitObligationRelatedto2016AmendmentstoTVAPensionPlan": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortization Period for Change in Benefit Obligation Related to 2016 Amendments to TVA Pension Plan",
        "label": "Amortization Period for Change in Benefit Obligation Related to 2016 Amendments to TVA Pension Plan",
        "terseLabel": "Amortization Period for Change in Benefit Obligation Related to 2016 Amendments to TVA Pension Plan"
       }
      }
     },
     "localname": "AmortizationPeriodforChangeinBenefitObligationRelatedto2016AmendmentstoTVAPensionPlan",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_AmortizationofReacquiredRights": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortization of Reacquired Rights",
        "label": "Amortization of Reacquired Rights",
        "terseLabel": "Amortization of Reacquired Rights"
       }
      }
     },
     "localname": "AmortizationofReacquiredRights",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amortizationperiod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amortization period.",
        "label": "Amortization period",
        "terseLabel": "Capitalized software amortization period"
       }
      }
     },
     "localname": "Amortizationperiod",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_AmountOfAppropriationInvestmentThatMustBeRepaid": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of the appropriation investment from Congress that must be repaid.",
        "label": "Amount of appropriation investment that must be repaid",
        "terseLabel": "Amount of appropriation investment that was repaid"
       }
      }
     },
     "localname": "AmountOfAppropriationInvestmentThatMustBeRepaid",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfBondsRedeemed": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of bonds redeemed.",
        "label": "Amount of bonds redeemed",
        "terseLabel": "Amount of bonds redeemed"
       }
      }
     },
     "localname": "AmountOfBondsRedeemed",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/SubsequentEventsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfDefinedBenefitPlanActuarialGainLossFromAssumptionChangeInElections": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan actuarial gain (loss) from assumption change in elections",
        "label": "Amount of defined benefit plan actuarial gain (loss) from assumption change in elections",
        "terseLabel": "Amount of defined benefit plan actuarial gain (loss) from assumption change in elections"
       }
      }
     },
     "localname": "AmountOfDefinedBenefitPlanActuarialGainLossFromAssumptionChangeInElections",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfDefinedBenefitPlanActuarialGainLossFromChangeInDemograhicAndPlanExperience": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience",
        "label": "Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience",
        "terseLabel": "Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience"
       }
      }
     },
     "localname": "AmountOfDefinedBenefitPlanActuarialGainLossFromChangeInDemograhicAndPlanExperience",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfDefinedBenefitPlanActuarialGainLossFromDiscountRateChange": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) from changes in actuarial assumptions related to discount rates which affects the defined benefit plan obligations.",
        "label": "Amount of defined benefit plan actuarial gain (loss) from discount rate change",
        "negatedTerseLabel": "Amount of defined benefit plan actuarial gain (loss) from discount rate change"
       }
      }
     },
     "localname": "AmountOfDefinedBenefitPlanActuarialGainLossFromDiscountRateChange",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfInsuranceAvailableForLossAtAnyOneSite": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of property, decommissioning, and decontamination insurance available for loss at any one site to cover the cost of stabilizing or shutting down a reactor after an accident.",
        "label": "Amount of insurance available for loss at any one site",
        "terseLabel": "Amount of insurance available for loss at any one site"
       }
      }
     },
     "localname": "AmountOfInsuranceAvailableForLossAtAnyOneSite",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfInsuranceAvailableForLossAtAnyOneSiteMax": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of insurance available for loss at any one site, max",
        "label": "Amount of insurance available for loss at any one site, max",
        "terseLabel": "Amount of insurance available for loss at any one site, max"
       }
      }
     },
     "localname": "AmountOfInsuranceAvailableForLossAtAnyOneSiteMax",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of property, decommissioning, and decontamination insurance carried for nuclear plants owned to cover the cost of stabilizing or shutting down a reactor after an accident.",
        "label": "Amount of property, decommissioning, and decontamination insurance carried",
        "terseLabel": "Amount of property, decommissioning, and decontamination insurance carried"
       }
      }
     },
     "localname": "AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountOfRedeemableBondIssuesOutstanding": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of redeemable bond issues outstanding",
        "label": "Amount of redeemable bond issues outstanding",
        "terseLabel": "Amount of redeemable bond issues outstanding"
       }
      }
     },
     "localname": "AmountOfRedeemableBondIssuesOutstanding",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountRemainingToBeSpentUnderEnvironmentalAgreements": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount remaining to be spent under environmental agreements",
        "label": "Amount remaining to be spent under environmental agreements",
        "terseLabel": "Amount remaining to be spent under environmental agreements"
       }
      }
     },
     "localname": "AmountRemainingToBeSpentUnderEnvironmentalAgreements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountSpentToReduceEmissions": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount spent to reduce emissions at power plants.",
        "label": "Amount spent to reduce emissions",
        "terseLabel": "Amount spent to reduce emissions"
       }
      }
     },
     "localname": "AmountSpentToReduceEmissions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountToBeInvestedInCertainEnvironmentalProjects": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount to be invested in certain environmental projects",
        "label": "Amount to be invested in certain environmental projects",
        "terseLabel": "Amount to be invested in certain environmental projects"
       }
      }
     },
     "localname": "AmountToBeInvestedInCertainEnvironmentalProjects",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountToBePaidInCivilPenalties": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of environmental agreements to be paid in civil penalties.",
        "label": "Amount to be paid in civil penalties",
        "terseLabel": "Amount to be paid in civil penalties"
       }
      }
     },
     "localname": "AmountToBePaidInCivilPenalties",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountToBeProvidedToFundEnvironmentalProjects": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount to be provided to fund environmental projects in Alabama, Kentucky, North Carolina, and Tennessee",
        "label": "Amount to be provided to fund environmental projects",
        "terseLabel": "Amount to be provided to fund environmental projects"
       }
      }
     },
     "localname": "AmountToBeProvidedToFundEnvironmentalProjects",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountToPayCivilPenalties": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount to pay civil penalties",
        "label": "Amount to pay civil penalties",
        "terseLabel": "Amount to pay civil penalties"
       }
      }
     },
     "localname": "AmountToPayCivilPenalties",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountcapitalizedduetoactionsofregulator": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount capitalized into regulatory assets due to actions of regulator related to pension benefits",
        "label": "Amount capitalized due to actions of regulator",
        "negatedTerseLabel": "Amount expensed (capitalized) due to actions of regulator"
       }
      }
     },
     "localname": "Amountcapitalizedduetoactionsofregulator",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountofchangerelatedtoactual": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of change related to actual",
        "label": "Amount of change related to actual",
        "terseLabel": "Amount of change related to actual"
       }
      }
     },
     "localname": "Amountofchangerelatedtoactual",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountofdefinedbenefitplanactuarialgainlossfromchangeinCOLA": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan actuarial gain (loss) from change in COLA.",
        "label": "Amount of defined benefit plan actuarial gain (loss) from change in COLA",
        "terseLabel": "Amount of defined benefit plan actuarial gain (loss) from change in COLA"
       }
      }
     },
     "localname": "AmountofdefinedbenefitplanactuarialgainlossfromchangeinCOLA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountofdefinedbenefitplanactuarialgainlossfromchangeinhealthcaretrendrateassumptions": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan actuarial gain (loss) from change in health care trend rate assumptions",
        "label": "Amount of defined benefit plan actuarial gain (loss) from change in health care trend rate assumptions",
        "terseLabel": "Amount of defined benefit plan actuarial gain (loss) from change in health care trend rate assumptions"
       }
      }
     },
     "localname": "Amountofdefinedbenefitplanactuarialgainlossfromchangeinhealthcaretrendrateassumptions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountofdefinedbenefitplanactuarialgainlossfromchangeinmortalityassumption": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) from changes in actuarial assumptions related to mortality changes which affects the defined benefit plan obligations.",
        "label": "Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption",
        "negatedTerseLabel": "Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption"
       }
      }
     },
     "localname": "Amountofdefinedbenefitplanactuarialgainlossfromchangeinmortalityassumption",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountofdefinedbenefitplanactuarialgainlossfromupdatedcapitaclaimscostsandretireecontributions": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions",
        "label": "Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions",
        "negatedTerseLabel": "Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions"
       }
      }
     },
     "localname": "Amountofdefinedbenefitplanactuarialgainlossfromupdatedcapitaclaimscostsandretireecontributions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountrelatedtochangeinnumberofparticipants": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount related to change in number of participants",
        "label": "Amount related to change in number of participants",
        "terseLabel": "Amount related to change in number of participants"
       }
      }
     },
     "localname": "Amountrelatedtochangeinnumberofparticipants",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountrelatedtochangeinpaymentelections": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount related to change in payment elections",
        "label": "Amount related to change in payment elections",
        "terseLabel": "Amount related to change in payment elections"
       }
      }
     },
     "localname": "Amountrelatedtochangeinpaymentelections",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountrelatedtoexperienceloss": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount related to experience loss",
        "label": "Amount related to experience loss",
        "terseLabel": "Amount related to experience loss"
       }
      }
     },
     "localname": "Amountrelatedtoexperienceloss",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountsRecognizedOnBalanceSheetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amounts Recognized on Balance Sheets",
        "label": "Amounts Recognized on Balance Sheets [Table Text Block]",
        "terseLabel": "Amounts Recognized on Balance Sheets"
       }
      }
     },
     "localname": "AmountsRecognizedOnBalanceSheetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_AmountsRecognizedOnStatementsOfCashFlowsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amounts Recognized on Statements of Cash Flows",
        "label": "Amounts Recognized on Statements of Cash Flows [Table Text Block]",
        "terseLabel": "Amounts Recognized on Statements of Cash Flows"
       }
      }
     },
     "localname": "AmountsRecognizedOnStatementsOfCashFlowsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_Amountspenttoreduceemissionssince1970": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount spent since 1970 to reduce emissions at power plants.",
        "label": "Amount spent to reduce emissions since 1970",
        "terseLabel": "Amount spent to reduce emissions since 1970"
       }
      }
     },
     "localname": "Amountspenttoreduceemissionssince1970",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Amountspentunderenvironmentalagreements": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount spent under environmental agreements",
        "label": "Amount spent under environmental agreements",
        "terseLabel": "Amount spent under environmental agreements"
       }
      }
     },
     "localname": "Amountspentunderenvironmentalagreements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AmountsrecognizedonConsolidatedBalanceSheetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Amounts recognized on Consolidated Balance Sheets [Table]",
        "label": "Amounts recognized on Consolidated Balance Sheets [Table Text Block]",
        "terseLabel": "Amounts recognized on Consolidated Balance Sheets"
       }
      }
     },
     "localname": "AmountsrecognizedonConsolidatedBalanceSheetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_AmounttoPayConsentDecree": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount to Pay Consent Decree",
        "label": "Amount to Pay Consent Decree",
        "terseLabel": "Amount to Pay Consent Decree"
       }
      }
     },
     "localname": "AmounttoPayConsentDecree",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AppropriationInvestmentAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Appropriation Investment [Axis]",
        "label": "Appropriation Investment [Axis]",
        "terseLabel": "Appropriation Investment"
       }
      }
     },
     "localname": "AppropriationInvestmentAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_AppropriationInvestmentDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Appropriation Investment [Domain]",
        "label": "Appropriation Investment [Domain]",
        "terseLabel": "Appropriation Investment"
       }
      }
     },
     "localname": "AppropriationInvestmentDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_AppropriationInvestmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Appropriation Investment [Line Items]",
        "label": "Appropriation Investment [Line Items]",
        "terseLabel": "Appropriation Investment"
       }
      }
     },
     "localname": "AppropriationInvestmentLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_AppropriationInvestmentNonpowerProgramsNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "tve_ProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government for programs (exclusive of the power program) and program income received offset by expenses incurred in the administration of these programs.",
        "label": "Appropriation investment nonpower programs, net",
        "verboseLabel": "Nonpower programs appropriation investment, net"
       }
      }
     },
     "localname": "AppropriationInvestmentNonpowerProgramsNet",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AppropriationInvestmentPowerProgram": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "tve_TotalPowerProgramProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Balance of appropriated funds advanced and property transferred to/from the reporting entity by the U.S. government as an investment in its power program.",
        "label": "Appropriation-investment power program",
        "terseLabel": "Appropriation-investment power program",
        "verboseLabel": "Power program appropriation investment"
       }
      }
     },
     "localname": "AppropriationInvestmentPowerProgram",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AppropriationInvestmentTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Appropriation Investment",
        "label": "Appropriation Investment [Table]",
        "terseLabel": "Summary of Proprietary Capital Activity"
       }
      }
     },
     "localname": "AppropriationInvestmentTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ArtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset Retirement Trust. The ART holds funds for the costs related to the future closure and retirement of TVA's long-lived assets. The ART is composed of multiple types of investments and is managed by external institutional investors.",
        "label": "ART [Member]",
        "terseLabel": "ART"
       }
      }
     },
     "localname": "ArtMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_AssessmentFromLicenseesForEachLicensedReactor": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An assessment from licensees for each licensed nuclear reactor in the United States to fund the second layer, the Secondary Financial Program.",
        "label": "Assessment from licensees for each licensed reactor",
        "terseLabel": "Assessment from licensees for each licensed reactor"
       }
      }
     },
     "localname": "AssessmentFromLicenseesForEachLicensedReactor",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AssetRetirementObligationDisclosureLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Line Items] for Asset Retirement Obligation Disclosure [Table]",
        "label": "Asset Retirement Obligation Disclosure [Line Items]",
        "terseLabel": "Liabilities Settled [Line Items]"
       }
      }
     },
     "localname": "AssetRetirementObligationDisclosureLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_AssetRetirementObligationDisclosureTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset Retirement Obligation Disclosure [Table]",
        "label": "Asset Retirement Obligation Disclosure [Table]",
        "terseLabel": "Asset Retirement Obligation Disclosure [Table]"
       }
      }
     },
     "localname": "AssetRetirementObligationDisclosureTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_AssetRetirementObligationRevisionofEstimateOther": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset Retirement Obligation, Revision of Estimate (Other)",
        "label": "Asset Retirement Obligation, Revision of Estimate (Other)",
        "negatedTerseLabel": "Revision of estimate (other non nuclear)"
       }
      }
     },
     "localname": "AssetRetirementObligationRevisionofEstimateOther",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Assetdisposition": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset disposition",
        "label": "Asset disposition",
        "terseLabel": "Asset disposition"
       }
      }
     },
     "localname": "Assetdisposition",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AssociatedBondIssuesCurrencyExposure": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.",
        "label": "Associated bond issues currency exposure",
        "terseLabel": "Associated TVA bond issues currency exposure"
       }
      }
     },
     "localname": "AssociatedBondIssuesCurrencyExposure",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_AvailableCreditOnPublicPowerSupportAndStabilizationProgram": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available Credit on Public Power Support and Stabilization Program",
        "label": "Available Credit on Public Power Support and Stabilization Program",
        "terseLabel": "Available Credit on Public Power Support and Stabilization Program"
       }
      }
     },
     "localname": "AvailableCreditOnPublicPowerSupportAndStabilizationProgram",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Balance": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capital balance.",
        "label": "Balance",
        "periodEndLabel": "Balance at end of year",
        "periodStartLabel": "Balance at beginning of year"
       }
      }
     },
     "localname": "Balance",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_BalanceinRegulatoryassetConstructioncosts": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The remaining balance in the deferred generating units regulatory asset will not continue to be amortized into rates, but will be included in the plant asset balance at completion of construction.",
        "label": "Balance in Regulatory asset-Construction costs",
        "terseLabel": "Balance in Regulatory asset-Construction costs"
       }
      }
     },
     "localname": "BalanceinRegulatoryassetConstructioncosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_BenefitPlanParticipantClassAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Benefit Plan Participant Class [Axis]",
        "label": "Benefit Plan Participant Class [Axis]",
        "terseLabel": "Benefit Plan Participant Class [Axis]"
       }
      }
     },
     "localname": "BenefitPlanParticipantClassAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_BenefitPlanParticipantClassDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Domain] for Benefit Plan Participant Class [Axis]",
        "label": "Benefit Plan Participant Class [Domain]",
        "terseLabel": "Benefit Plan Participant Class [Domain]"
       }
      }
     },
     "localname": "BenefitPlanParticipantClassDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_BillCreditsForLTA": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Bill credits for LTA",
        "label": "Bill credits for LTA",
        "terseLabel": "Bill credits for LTA"
       }
      }
     },
     "localname": "BillCreditsForLTA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_BlendedLowEnrichedUraniumProgramPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for the blended low-enrichment uranium (BLEU) program. Examples include information about the accrual of an obligation under this program and recognition of a capital lease asset and corresponding lease obligation.",
        "label": "Blended Low-Enriched Uranium Program [Policy Text Block]",
        "terseLabel": "Down-blend Offering for Tritium"
       }
      }
     },
     "localname": "BlendedLowEnrichedUraniumProgramPolicyTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_BlendedSecurityCommingledFundsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment funds comprised of multiple individual financial instruments that are classified based on their existing investment portfolio as of the measurement date. Blended security commingled funds are composed of debt, equity, currency, and commoditiy securities.",
        "label": "Blended security commingled funds [Member]",
        "terseLabel": "Blended security commingled funds"
       }
      }
     },
     "localname": "BlendedSecurityCommingledFundsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_BondIssuesWithSurvivorsOption": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of bond issues which include a \"survivor's option\" allowing for the right of redemption upon the death of a beneficial owner in certain specified circumstances.",
        "label": "Bond issues with survivor's option",
        "terseLabel": "Bond issues with survivor's option"
       }
      }
     },
     "localname": "BondIssuesWithSurvivorsOption",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_BondsOutstandingWithSurvivorsOption": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of bonds outstanding which include a \"survivor's option\" allowing for the right of redemption upon the death of a beneficial owner in certain specified circumstances.",
        "label": "Bonds outstanding with survivor's option",
        "terseLabel": "Bonds outstanding with survivor's option"
       }
      }
     },
     "localname": "BondsOutstandingWithSurvivorsOption",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_BusinessCombinationsandSettlementofPreexistingRelationshipsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Business Combinations and Settlement of Preexisting Relationships [Abstract]",
        "label": "Business Combinations and Settlement of Preexisting Relationships [Abstract]",
        "terseLabel": "Business Combinations and Settlement of Preexisting Relationships [Abstract]"
       }
      }
     },
     "localname": "BusinessCombinationsandSettlementofPreexistingRelationshipsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_CGLPcapitalleaseasset": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gross fair value of capital lease asset recognized as part of CGLP purchased power agreement reassessment.",
        "label": "CGLP capital lease asset",
        "terseLabel": "CGLP Capital lease liability"
       }
      }
     },
     "localname": "CGLPcapitalleaseasset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_COLApercentageincreasedecrease": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "COLA percentage increase (decrease)",
        "label": "COLA percentage increase (decrease)",
        "terseLabel": "COLA percentage increase (decrease)"
       }
      }
     },
     "localname": "COLApercentageincreasedecrease",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_CallPricePercent": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Call price - low end of range. Shown as a percent of principal amount.",
        "label": "Call price percent",
        "terseLabel": "Call price"
       }
      }
     },
     "localname": "CallPricePercent",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_CapitalizedrevenueandexpenseduringprecommercialplantoperationsPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capitalized revenue and expense during pre-commercial plant operations",
        "label": "Capitalized revenue and expense during pre-commercial plant operations [Policy Text Block]",
        "terseLabel": "Pre-Commercial Plant Operations"
       }
      }
     },
     "localname": "CapitalizedrevenueandexpenseduringprecommercialplantoperationsPolicyTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_CapitalizedrevenueduringprecommercialplantoperationsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capitalized revenue during pre-commercial plant operations [Member]",
        "label": "Capitalized revenue during pre-commercial plant operations [Member]",
        "terseLabel": "Capitalized revenue during pre-commercial plant operations [Member]"
       }
      }
     },
     "localname": "CapitalizedrevenueduringprecommercialplantoperationsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Carryingvalueofleaseleasebackobligationssettled": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value of lease/leaseback obligations settled",
        "label": "Carrying value of lease/leaseback obligations settled",
        "terseLabel": "Lease/leaseback obligations settled"
       }
      }
     },
     "localname": "Carryingvalueofleaseleasebackobligationssettled",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Case Involving Tennessee Valley Authority Retirement System [Member]",
        "label": "Case Involving Tennessee Valley Authority Retirement System [Member]",
        "terseLabel": "Case Involving Tennessee Valley Authority Retirement System"
       }
      }
     },
     "localname": "CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_CashCollateralForBorrowedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.",
        "label": "Cash collateral for Borrowed Securities [Member]",
        "terseLabel": "Securities lending commingled funds"
       }
      }
     },
     "localname": "CashCollateralForBorrowedSecuritiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_ChangeInAROFromInactiveCCRFacilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails": {
       "order": 2.0,
       "parentTag": "tve_TotalAROChangeDueToCCR",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in ARO from inactive CCR facilities",
        "label": "Change in ARO from inactive CCR facilities",
        "terseLabel": "Change in ARO from inactive CCR facilities"
       }
      }
     },
     "localname": "ChangeInAROFromInactiveCCRFacilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ChangeInAROFromOperatingCCRFacilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails": {
       "order": 1.0,
       "parentTag": "tve_TotalAROChangeDueToCCR",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in ARO from operating CCR facilities",
        "label": "Change in ARO from operating CCR facilities",
        "terseLabel": "Change in ARO from operating CCR facilities"
       }
      }
     },
     "localname": "ChangeInAROFromOperatingCCRFacilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ChangeInDiscountRateOrRateOfReturnOnPlanAssetsAssumption": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The change in the discount date or the rate of return on plan assets assumption that is used in disclosure of sensitivity of the net periodic pension cost and the projected benefit obligation to changes in those rates.",
        "label": "Change in Discount Rate or Rate of Return on Plan Assets Assumption",
        "terseLabel": "Change in Assumption"
       }
      }
     },
     "localname": "ChangeInDiscountRateOrRateOfReturnOnPlanAssetsAssumption",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_ChangeInInterestIncome": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in interest income",
        "label": "Change in interest income",
        "terseLabel": "Change in interest income"
       }
      }
     },
     "localname": "ChangeInInterestIncome",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ChangeInPlantDecommissioningObligations": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in plant decommissioning obligations",
        "label": "Change in plant decommissioning obligations",
        "terseLabel": "Change in plant decommissioning obligations"
       }
      }
     },
     "localname": "ChangeInPlantDecommissioningObligations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ChangeinPlanAssetsduetoCollections": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in Plan Assets due to Collections",
        "label": "Change in Plan Assets due to Collections",
        "terseLabel": "Change in Plan Assets due to Collections"
       }
      }
     },
     "localname": "ChangeinPlanAssetsduetoCollections",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ChangeinUnrealizedgainslossesonInterestRateDerivatives": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of interest rate derivatives held at each balance sheet date.",
        "label": "Change in Unrealized gains (losses) on Interest Rate Derivatives",
        "terseLabel": "Change in Unrealized gains (losses) on Interest Rate Derivatives"
       }
      }
     },
     "localname": "ChangeinUnrealizedgainslossesonInterestRateDerivatives",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Changeindepreciationduetonewstudy": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in depreciation due to new study",
        "label": "Change in depreciation due to new study",
        "terseLabel": "Change in depreciation due to new study"
       }
      }
     },
     "localname": "Changeindepreciationduetonewstudy",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Changeininterestrateswapliabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in interest rate swap liabilities",
        "label": "Change in interest rate swap liabilities",
        "terseLabel": "Derivative Liability"
       }
      }
     },
     "localname": "Changeininterestrateswapliabilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Changeinotherincomeexpense": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Change in other income (expense)",
        "label": "Change in other income (expense)",
        "terseLabel": "Change in other income (expense)"
       }
      }
     },
     "localname": "Changeinotherincomeexpense",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_CivilPenaltiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Civil Penalties [Member]",
        "label": "Civil Penalties [Member]",
        "terseLabel": "Civil Penalties"
       }
      }
     },
     "localname": "CivilPenaltiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_ClosedDerivativeContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Closed Derivative Contracts [Member]",
        "label": "Closed Derivative Contracts [Member]",
        "terseLabel": "Closed Derivative Contracts"
       }
      }
     },
     "localname": "ClosedDerivativeContractsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_CollateralAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Collateral [Abstract]",
        "label": "Collateral [Abstract]",
        "terseLabel": "Collateral [Abstract]"
       }
      }
     },
     "localname": "CollateralAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_CollateralizedCommercialMortgageBackedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by commercial mortgage loans.",
        "label": "Collateralized Commercial Mortgage Backed Securities [Member]",
        "terseLabel": "Commercial mortgage-backed securities"
       }
      }
     },
     "localname": "CollateralizedCommercialMortgageBackedSecuritiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Commingledfundsmeasuredatnetassetvalue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 10.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value measurements of investment funds comprised of multiple individual financial instruments that are measured at net asset value",
        "label": "Commingled funds measured at net asset value",
        "terseLabel": "Commingled funds measured at net asset value"
       }
      }
     },
     "localname": "Commingledfundsmeasuredatnetassetvalue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption [Abstract]",
        "label": "Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption [Abstract]",
        "terseLabel": "Commitments and Contingencies - Membership Interests of VIE Subject to Mandatory Redemption [Abstract]"
       }
      }
     },
     "localname": "CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_CommodityCommingledFundMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment funds comprised of multiple individual financial instruments that are classified based on their existing investment portfolio as of the measurement date. Commodity commingled funds are composed of commodity securities.",
        "label": "Commodity Commingled Fund [Member]",
        "terseLabel": "Commodity commingled funds"
       }
      }
     },
     "localname": "CommodityCommingledFundMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_CommodityContractLiabilityNoncurrent": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of the liability arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.",
        "label": "Commodity contract liability noncurrent",
        "terseLabel": "Commodity contract derivative liabilities"
       }
      }
     },
     "localname": "CommodityContractLiabilityNoncurrent",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Commoditycontractderivativeliabilitiesfairvaluedisclosure": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value as of the balance sheet date of firm obligations in physical commodity contracts (for example, agricultural products, metals and energy).",
        "label": "Commodity contract derivative liabilities, fair value disclosure",
        "terseLabel": "Commodity contract derivatives",
        "verboseLabel": "Commodity contract derivatives, liabilities"
       }
      }
     },
     "localname": "Commoditycontractderivativeliabilitiesfairvaluedisclosure",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ComponentOfOtherIncomeExpenseLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Component of Other Income (Expense) [Line Items]",
        "label": "Component of Other Income (Expense) [Line Items]",
        "terseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "ComponentOfOtherIncomeExpenseLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ComponentsOfNetPeriodicBenefitCostAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of Net Periodic Benefit Cost [Abstract]",
        "label": "Components of Net Periodic Benefit Cost [Abstract]",
        "terseLabel": "Components of Net Periodic Benefit Cost [Abstract]"
       }
      }
     },
     "localname": "ComponentsOfNetPeriodicBenefitCostAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_ComputedAverageInterestRatePayable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The computed average interest rate payable by the U.S. Treasury on its total marketable public obligations.",
        "label": "Computed average interest rate payable",
        "terseLabel": "Computed average interest rate payable"
       }
      }
     },
     "localname": "ComputedAverageInterestRatePayable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_CostofLivingAdjustmentsDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cost of Living Adjustments [Domain]",
        "label": "Cost of Living Adjustments [Domain]",
        "terseLabel": "Cost of Living Adjustments [Domain]"
       }
      }
     },
     "localname": "CostofLivingAdjustmentsDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Costsforasbestos": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Costs for asbestos",
        "label": "Costs for asbestos",
        "terseLabel": "Costs for asbestos"
       }
      }
     },
     "localname": "Costsforasbestos",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_CounterpartyCreditRiskAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Counterparty Credit Risk [Abstract]",
        "label": "Counterparty Credit Risk [Abstract]",
        "terseLabel": "Counterparty Credit Risk [Abstract]"
       }
      }
     },
     "localname": "CounterpartyCreditRiskAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_CreditOfCustomersMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit of Customers [Member]",
        "label": "Credit of Customers [Member]",
        "terseLabel": "Credit of Customers"
       }
      }
     },
     "localname": "CreditOfCustomersMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_CtAndQteOutstandingLeasebackObligation": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The outstanding leaseback obligations related to combustion turbine units and qualified technological equipment and software.",
        "label": "CT and QTE outstanding leaseback obligation",
        "terseLabel": "CT and QTE outstanding leaseback obligation"
       }
      }
     },
     "localname": "CtAndQteOutstandingLeasebackObligation",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_CurrencySwapsOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Currency Swaps Outstanding [Abstract]",
        "label": "Currency Swaps Outstanding [Abstract]",
        "terseLabel": "Currency Swaps Outstanding [Abstract]"
       }
      }
     },
     "localname": "CurrencySwapsOutstandingAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_CurrencySwapsOutstandingTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Table showing the effective date, associated currency exposure, expiration date, and overall effective cost of the outstanding currency swaps.",
        "label": "Currency Swaps Outstanding [Table Text Block]",
        "terseLabel": "Currency Swaps Outstanding"
       }
      }
     },
     "localname": "CurrencySwapsOutstandingTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_DebtAndOtherObligationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt and Other Obligations",
        "label": "Debt and Other Obligations [Abstract]",
        "terseLabel": "Debt and Other Obligations [Abstract]"
       }
      }
     },
     "localname": "DebtAndOtherObligationsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_DebtCeiling": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cap on the amount of bonds the company can have outstanding.",
        "label": "Debt ceiling",
        "terseLabel": "Debt ceiling"
       }
      }
     },
     "localname": "DebtCeiling",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DebtGeneralTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt - General [Table]",
        "label": "Debt - General [Table]",
        "terseLabel": "General"
       }
      }
     },
     "localname": "DebtGeneralTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DebtInstrumentInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Interest Rate",
        "label": "Debt Instrument, Interest Rate",
        "terseLabel": "Debt Instrument, Interest Rate"
       }
      }
     },
     "localname": "DebtInstrumentInterestRate",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_DebtOfVariableInterestEntitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt of variable interest entities [Member]",
        "label": "Debt of variable interest entities [Member]",
        "terseLabel": "Debt of variable interest entities"
       }
      }
     },
     "localname": "DebtOfVariableInterestEntitiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_DebtOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Outstanding [Abstract]",
        "label": "Debt Outstanding [Abstract]",
        "terseLabel": "Debt Outstanding [Abstract]"
       }
      }
     },
     "localname": "DebtOutstandingAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_DebtOutstandingTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Outstanding [Table]",
        "label": "Debt Outstanding [Table]",
        "terseLabel": "Debt Outstanding"
       }
      }
     },
     "localname": "DebtOutstandingTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DebtSecuritiesIssues": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Securities Issues",
        "label": "Debt Securities Issues",
        "terseLabel": "Debt Securities Issues"
       }
      }
     },
     "localname": "DebtSecuritiesIssues",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DebtSecuritiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of debt issues, redemptions, and maturities",
        "label": "Debt Securities [Table Text Block]",
        "terseLabel": "Debt Securities Activity"
       }
      }
     },
     "localname": "DebtSecuritiesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_DebtSecurityCommingledFundsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment funds comprised of multiple individual financial instruments that are classified based on their existing investment portfolio as of the measurement date. Debt security commingled funds are exclusively composed of debt securities.",
        "label": "Debt security commingled funds [Member]",
        "terseLabel": "Debt security commingled funds"
       }
      }
     },
     "localname": "DebtSecurityCommingledFundsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_DebtissuesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt issues [Axis]",
        "label": "Debt issues [Axis]",
        "terseLabel": "Debt issues [Axis]"
       }
      }
     },
     "localname": "DebtissuesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DebtissuesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Domain] for Debt issues [Axis]",
        "label": "Debt issues [Domain]",
        "terseLabel": "Debt issues [Domain]"
       }
      }
     },
     "localname": "DebtissuesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_DecreaseIncreaseInFuelExpense": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The decrease (increase) in fuel expense relating to the FTP.",
        "label": "Decrease (increase) in fuel expense",
        "terseLabel": "Decrease (increase) in fuel expense"
       }
      }
     },
     "localname": "DecreaseIncreaseInFuelExpense",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DecreaseIncreaseInPurchasedPowerExpense": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The decrease (increase) in purchased power expense related to the FTP.",
        "label": "Decrease (increase) in purchased power expense",
        "terseLabel": "Decrease (increase) in purchased power expense"
       }
      }
     },
     "localname": "DecreaseIncreaseInPurchasedPowerExpense",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DeferralOfEnergyRightLaons": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Deferral of EnergyRight laons",
        "label": "Deferral of EnergyRight laons",
        "terseLabel": "Deferral of EnergyRight laons"
       }
      }
     },
     "localname": "DeferralOfEnergyRightLaons",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfAmountsCapitalizedDueToActionsOfRegulatory": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory",
        "label": "Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory",
        "terseLabel": "Defined Benefit Plan Amortization From Regulatory Assets Of Amounts Capitalized due to Actions of Regulatory"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfAmountsCapitalizedDueToActionsOfRegulatory",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetGainsLosses": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amounts in regulatory assets related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.",
        "label": "Defined Benefit Plan Amortization From Regulatory Assets Of Net Gains Losses",
        "terseLabel": "Net actuarial loss"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetGainsLosses",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetPriorServiceCostCredit": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amounts in regulatory assets related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.",
        "label": "Defined Benefit Plan Amortization From Regulatory Assets Of Net Prior Service Cost Credit",
        "negatedTerseLabel": "Prior service cost (credit)"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetPriorServiceCostCredit",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAmountsDeferredAsRegulatoryAssetsNetGainsLosses": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount deferred as regulatory asset of gains and losses that are not yet recognized as a component of net periodic benefit cost. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.",
        "label": "Defined benefit plan amounts deferred as regulatory assets net gains (losses)",
        "negatedTerseLabel": "Unrecognized net loss"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmountsDeferredAsRegulatoryAssetsNetGainsLosses",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAmountsDeferredAsRegulatoryAssetsNetPriorServiceCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Deferred amount in regulatory assets related to the cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.",
        "label": "Defined benefit plan amounts deferred as regulatory assets net prior service cost",
        "terseLabel": "Unrecognized prior service cost (credit)"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmountsDeferredAsRegulatoryAssetsNetPriorServiceCost",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanAssetFairValueMeasurementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined Benefit Plan Asset Fair Value Measurements [Abstract]",
        "label": "Defined Benefit Plan Asset Fair Value Measurements [Abstract]",
        "terseLabel": "Defined Benefit Plan Asset Fair Value Measurements [Abstract]"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssetFairValueMeasurementsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_DefinedBenefitPlanContributionsbyPlanParticipantsFederalReinsurancePaymentsandProviderDiscountsandRebates.": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of contributions made by plan participants, federal reinsurance payments, and provider discounts and rebates. This item represents a periodic increase to the plan obligation and an increase to plan assets.",
        "label": "Defined Benefit Plan, Contributions by Plan Participants, Federal Reinsurance Payments, and Provider Discounts and Rebates.",
        "terseLabel": "Collections"
       }
      }
     },
     "localname": "DefinedBenefitPlanContributionsbyPlanParticipantsFederalReinsurancePaymentsandProviderDiscountsandRebates.",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanCostOfLivingAdjustmentAssumption": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cost of living adjustment percentage used for defined benefit plans.",
        "label": "Defined Benefit Plan, Cost of Living Adjustment Assumption",
        "terseLabel": "Defined Benefit Plan, Cost of Living Adjustment Assumption"
       }
      }
     },
     "localname": "DefinedBenefitPlanCostOfLivingAdjustmentAssumption",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_DefinedBenefitPlanExpectedPaymentsRelatedtoSERP": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined Benefit Plan, Expected Payments Related to SERP",
        "label": "Defined Benefit Plan, Expected Payments Related to SERP",
        "terseLabel": "Defined Benefit Plan, Expected Payments Related to SERP"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedPaymentsRelatedtoSERP",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanFairValueOfPlanDerivativeLiabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of liabilities as of the measurement date resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. These liabilities have been segregated and restricted (usually in a trust) for the purpose of defined benefit plan benefits.",
        "label": "Defined Benefit Plan, Fair Value of Plan Derivative Liabilities",
        "terseLabel": "Derivative liabilities"
       }
      }
     },
     "localname": "DefinedBenefitPlanFairValueOfPlanDerivativeLiabilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlanNewPolicyTargetPlanAssetAllocations": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "New policy target allocation of investments of this type to total plan assets presented on a weighted average basis.",
        "label": "Defined Benefit Plan, New Policy Target Plan Asset Allocations",
        "terseLabel": "New Policy Target Allocation"
       }
      }
     },
     "localname": "DefinedBenefitPlanNewPolicyTargetPlanAssetAllocations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_DefinedBenefitPlanRelatedtoSERP": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined Benefit Plan, SERP",
        "label": "Defined Benefit Plan, Related to SERP",
        "terseLabel": "Defined Benefit Plan, Related to SERP"
       }
      }
     },
     "localname": "DefinedBenefitPlanRelatedtoSERP",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DefinedBenefitPlansEmployerContributionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined Benefit Plans Employer Contributions [Abstract]",
        "label": "Defined Benefit Plans Employer Contributions [Abstract]",
        "terseLabel": "Defined Benefit Plans Employer Contributions [Abstract]"
       }
      }
     },
     "localname": "DefinedBenefitPlansEmployerContributionsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_Definedbenefitplanamountsdeferredasregulatoryassetsactionsbyregulators": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined benefit plan amounts deferred as regulatory assets due to actions by regulators",
        "label": "Defined benefit plan amounts deferred as regulatory assets actions by regulators",
        "negatedTerseLabel": "Amount capitalized due to actions of regulator",
        "terseLabel": "Amount capitalized due to actions of regulator"
       }
      }
     },
     "localname": "Definedbenefitplanamountsdeferredasregulatoryassetsactionsbyregulators",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_DeiAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "DEI [Abstract]",
        "label": "DEI [Abstract]",
        "terseLabel": "DEI [Abstract]"
       }
      }
     },
     "localname": "DeiAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_DepreciationAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Depreciation [Axis]",
        "label": "Depreciation [Axis]",
        "verboseLabel": "Property, Plant, and Equipment, and Depreciation"
       }
      }
     },
     "localname": "DepreciationAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DepreciationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Depreciation [Domain]",
        "label": "Depreciation [Domain]",
        "verboseLabel": "Property, Plant, and Equipment, and Depreciation"
       }
      }
     },
     "localname": "DepreciationDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_DepreciationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Depreciation [Line Items]",
        "label": "Depreciation [Line Items]",
        "terseLabel": "Property, Plant, and Equipment, and Depreciation"
       }
      }
     },
     "localname": "DepreciationLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DepreciationRatesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of average depreciation rates by asset class.",
        "label": "Depreciation Rates [Table Text Block]",
        "terseLabel": "Property, Plant, and Equipment Depreciation Rates"
       }
      }
     },
     "localname": "DepreciationRatesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_DepreciationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Depreciation [Table]",
        "label": "Depreciation [Table]",
        "terseLabel": "Property, Plant, and Equipment, and Depreciation"
       }
      }
     },
     "localname": "DepreciationTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DerivativesUnderFinancialTradingProgramAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivatives Under Financial Trading Program [Axis]",
        "label": "Derivatives Under Financial Trading Program [Axis]",
        "terseLabel": "Derivatives Under Financial Trading Program"
       }
      }
     },
     "localname": "DerivativesUnderFinancialTradingProgramAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DerivativesUnderFinancialTradingProgramTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivatives Under Financial Trading Program [Table]",
        "label": "Derivatives Under Financial Trading Program [Table]",
        "terseLabel": "Derivatives Under Financial Trading Program"
       }
      }
     },
     "localname": "DerivativesUnderFinancialTradingProgramTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_DerivativesUnderFtpAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivatives Under FTP [Abstract]",
        "label": "Derivatives Under FTP [Abstract]",
        "terseLabel": "Derivatives Under FTP [Abstract]"
       }
      }
     },
     "localname": "DerivativesUnderFtpAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_Economicincentives": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Economic incentives",
        "label": "Economic incentives",
        "terseLabel": "Revenues"
       }
      }
     },
     "localname": "Economicincentives",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueEconomicDevelopmentIncentivesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_EffectiveDateofCurrencySwapContract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Effective Date of Currency Swap Contract",
        "label": "Effective Date of Currency Swap Contract",
        "terseLabel": "Effective Date of Currency Swap Contract"
       }
      }
     },
     "localname": "EffectiveDateofCurrencySwapContract",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "gYearItemType"
    },
    "tve_ElectricSubtotalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Electric Subtotal [Member]",
        "label": "Electric Subtotal [Member]",
        "terseLabel": "Electric Subtotal"
       }
      }
     },
     "localname": "ElectricSubtotalMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Electricrevenue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 1.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Revenue from sales of electricity",
        "label": "Electric revenue",
        "negatedTerseLabel": "Electric revenue",
        "terseLabel": "Electric revenue"
       }
      }
     },
     "localname": "Electricrevenue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails",
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ElectronotesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Electronotes [Member]",
        "label": "electronotes [Member]",
        "terseLabel": "electronotes"
       }
      }
     },
     "localname": "ElectronotesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EnergyEfficiencyProjectsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy Efficiency Projects [Member]",
        "label": "Energy Efficiency Projects [Member]",
        "terseLabel": "Energy Efficiency Projects"
       }
      }
     },
     "localname": "EnergyEfficiencyProjectsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EnergyPrepaymentDiscount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy Prepayment Discount",
        "label": "Energy Prepayment Discount",
        "terseLabel": "Energy Prepayment Discount"
       }
      }
     },
     "localname": "EnergyPrepaymentDiscount",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_EnergyPrepaymentObligationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Line Items] for Energy Prepayment Obligation [Table]",
        "label": "Energy Prepayment Obligation [Line Items]",
        "terseLabel": "Energy Prepayment Obligation [Line Items]"
       }
      }
     },
     "localname": "EnergyPrepaymentObligationLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_EnergyPrepaymentObligationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy Prepayment Obligation [Table]",
        "label": "Energy Prepayment Obligation [Table]",
        "terseLabel": "Energy Prepayment Obligation [Table]"
       }
      }
     },
     "localname": "EnergyPrepaymentObligationTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_EnergyPrepaymentObligationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Energy Prepayment Obligation [Table]",
        "label": "Energy Prepayment Obligation [Table Text Block]",
        "terseLabel": "Energy Prepayment Obligation [Table Text Block]"
       }
      }
     },
     "localname": "EnergyPrepaymentObligationTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_EnergyRightMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy Right Program",
        "label": "Energy Right [Member]",
        "terseLabel": "Energy Right"
       }
      }
     },
     "localname": "EnergyRightMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EnergyprepaymentobligationsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy prepayment obligations",
        "label": "Energy prepayment obligations [Member]",
        "terseLabel": "Energy prepayment obligations"
       }
      }
     },
     "localname": "EnergyprepaymentobligationsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EnvironmentalAgreementsLiability": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The liability related to the Environmental Agreements.",
        "label": "Environmental agreements liability",
        "verboseLabel": "Environmental agreements liability"
       }
      }
     },
     "localname": "EnvironmentalAgreementsLiability",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_EnvironmentalAgreementsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Environmental Agreements [Member]",
        "label": "Environmental Agreements [Member]",
        "terseLabel": "Environmental Agreements"
       }
      }
     },
     "localname": "EnvironmentalAgreementsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EquitySecurityCommingledFundsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment funds comprised of multiple individual financial instruments that are classified based on their existing investment portfolio as of the measurement date. Equity security commingled funds are exclusively composed of equity securities.",
        "label": "Equity security commingled funds [Member]",
        "terseLabel": "Equity security commingled funds"
       }
      }
     },
     "localname": "EquitySecurityCommingledFundsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_EstimatedFutureBenefitPaymentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Estimated Future Benefit Payments [Abstract]",
        "label": "Estimated Future Benefit Payments [Abstract]",
        "terseLabel": "Estimated Future Benefit Payments [Abstract]"
       }
      }
     },
     "localname": "EstimatedFutureBenefitPaymentsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_EstimatedValuesOfFinancialInstrumentsNotRecordedAtFairValueTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The tabular disclosure of the estimated values of financial instruments not recorded at fair value. This disclosure includes the class of financial instrument, valuation classification, carrying amount, and fair value.",
        "label": "Estimated Values of Financial Instruments Not Recorded at Fair Value [Table Text Block]",
        "terseLabel": "Estimated Values of Financial Instruments Not Recorded at Fair Value"
       }
      }
     },
     "localname": "EstimatedValuesOfFinancialInstrumentsNotRecordedAtFairValueTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_EstimatedValuesOfFinancialIntrumentsNotRecordedAtFairValueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Estimated Values of Financial Intruments Not Recorded at Fair Value [Abstract]",
        "label": "Estimated Values of Financial Intruments Not Recorded at Fair Value [Abstract]",
        "terseLabel": "Estimated Values of Financial Intruments Not Recorded at Fair Value [Abstract]"
       }
      }
     },
     "localname": "EstimatedValuesOfFinancialIntrumentsNotRecordedAtFairValueAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_ExpectedAmortizationOfRegulatoryAssetsInNextFiscalYearAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Expected Amortization of Regulatory Assets in Next Fiscal Year [Abstract]",
        "label": "Expected Amortization of Regulatory Assets in Next Fiscal Year [Abstract]",
        "terseLabel": "Expected Amortization of Regulatory Assets in Next Fiscal Year [Abstract]"
       }
      }
     },
     "localname": "ExpectedAmortizationOfRegulatoryAssetsInNextFiscalYearAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_ExpectedPaymentforPostretirementBenefits": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Expected Payment for Postretirement Benefits",
        "label": "Expected Payment for Postretirement Benefits",
        "terseLabel": "Expected Payment for Postretirement Benefits"
       }
      }
     },
     "localname": "ExpectedPaymentforPostretirementBenefits",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ExpirationDateofSwap": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Expiration Date of Swap",
        "label": "Expiration Date of Swap",
        "terseLabel": "Expiration Date of Swap"
       }
      }
     },
     "localname": "ExpirationDateofSwap",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "gYearItemType"
    },
    "tve_ExternalServices": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Revenue and expenses from external services included in Other income (expense), net on the Consolidated Statements of Operations.",
        "label": "External services",
        "terseLabel": "External services"
       }
      }
     },
     "localname": "ExternalServices",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include, but is not limited to: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset or liability.",
        "label": "Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]",
        "terseLabel": "Fair Value Measurements"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_FairValueAssetsOrLiabilitiesMeasuredOnRecurringBasisGainLossDeferredAsRegulatoryAssetsOrLiabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the amount of the total realized and unrealized gains or losses for the period which are deferred as regulatory assets and liabilities; the fair value of which assets or liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).",
        "label": "Fair Value, Assets or Liabilities Measured on Recurring Basis, Gain (Loss) Deferred as Regulatory Assets or Liabilities",
        "terseLabel": "Change in net unrealized gains (losses) deferred as regulatory assets and liabilities"
       }
      }
     },
     "localname": "FairValueAssetsOrLiabilitiesMeasuredOnRecurringBasisGainLossDeferredAsRegulatoryAssetsOrLiabilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FairValueByClassAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by class of asset or liability.",
        "label": "Fair Value By Class [Axis]",
        "terseLabel": "Fair Value By Class"
       }
      }
     },
     "localname": "FairValueByClassAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_FairValueByClassDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents classes of assets and liabilities measured and disclosed at fair value.",
        "label": "Fair Value By Class [Domain]",
        "terseLabel": "Fair Value By Class"
       }
      }
     },
     "localname": "FairValueByClassDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_FairValueInputsAssetsandLiabilitiesQuantitativeInformationTableTextBlockTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset or liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs.",
        "label": "Fair Value Inputs, Assets and Liabilities, Quantitative Information [Table Text Block] [Table Text Block]",
        "terseLabel": "Quantitative Information about Level 3 Fair Value Measurements"
       }
      }
     },
     "localname": "FairValueInputsAssetsandLiabilitiesQuantitativeInformationTableTextBlockTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOrLiabilityPurchasesSalesIssuesSettlementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset or Liability, Purchases, Sales, Issues, Settlements [Abstract]",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset or Liability, Purchases, Sales, Issues, Settlements [Abstract]",
        "terseLabel": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset or Liability, Purchases, Sales, Issues, Settlements [Abstract]"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOrLiabilityPurchasesSalesIssuesSettlementsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_FairValueMeasurementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value Measurements [Abstract]",
        "label": "Fair Value Measurements [Abstract]",
        "terseLabel": "Fair Value Measurements [Abstract]"
       }
      }
     },
     "localname": "FairValueMeasurementsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_FairValueMeasurementsTonsPerYear": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value measurement of tons per year used to determine fair value",
        "label": "Fair value measurements tons per year",
        "terseLabel": "Fair value measurements tons per year"
       }
      }
     },
     "localname": "FairValueMeasurementsTonsPerYear",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "weightItemType"
    },
    "tve_FairValueMeasurementsUsingSignificantUnobservableInputsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value Measurements Using Significant Unobservable Inputs [Abstract]",
        "label": "Fair Value Measurements Using Significant Unobservable Inputs [Abstract]",
        "terseLabel": "Fair Value Measurements Using Significant Unobservable Inputs [Abstract]"
       }
      }
     },
     "localname": "FairValueMeasurementsUsingSignificantUnobservableInputsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_FairValuePlanAssetsGross": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. This amount is not reduced by non-benefit liabilities.",
        "label": "Fair value plan assets gross",
        "terseLabel": "Fair value of gross plan assets"
       }
      }
     },
     "localname": "FairValuePlanAssetsGross",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FairValueassetsandliabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the fair value measurement of assets or liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset or liability.",
        "label": "Fair Value, assets and liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]",
        "terseLabel": "Fair Value Measurements Using Significant Unobservable Inputs"
       }
      }
     },
     "localname": "FairValueassetsandliabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_FederalagenciesandotherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Federal agencies and other [Member]",
        "label": "Federal agencies and other [Member]",
        "terseLabel": "Federal agencies and other [Member]"
       }
      }
     },
     "localname": "FederalagenciesandotherMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_FinanceLeaseLiabilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance lease liability",
        "label": "Finance lease liability [Member]",
        "terseLabel": "Finance lease liability"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_FinanceLeaseLiabilityPaymentAmountsRepresentingInterest": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance Lease, Liability, Payment Amounts Representing Interest",
        "label": "Finance Lease, Liability, Payment Amounts Representing Interest",
        "terseLabel": "Finance Lease, Liability, Payment Amounts Representing Interest"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentAmountsRepresentingInterest",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FinanceLeaseLiabilityPaymentsDueThereafter": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance Lease, Liability, Payments Due Thereafter",
        "label": "Finance Lease, Liability, Payments Due Thereafter",
        "terseLabel": "Finance Lease, Liability, Payments Due Thereafter"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueThereafter",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FinanceLeaseUnderPPA": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance lease under PPA",
        "label": "Finance lease under PPA",
        "terseLabel": "Finance lease under PPA"
       }
      }
     },
     "localname": "FinanceLeaseUnderPPA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FinancePresentValueOfNetMinimumLeasePayments": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance present value of net minimum lease payments",
        "label": "Finance present value of net minimum lease payments",
        "terseLabel": "Finance present value of net minimum lease payments"
       }
      }
     },
     "localname": "FinancePresentValueOfNetMinimumLeasePayments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FinancialInstrumentsOwnedMortgagesResidentialMortgagebackedandAssetbackedSecuritiesatFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value as of the balance sheet date of firm holdings in mortgages, residential mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.",
        "label": "Financial Instruments, Owned, Mortgages, Residential Mortgage-backed and Asset-backed Securities, at Fair Value",
        "terseLabel": "Mortgage and asset-backed securities"
       }
      }
     },
     "localname": "FinancialInstrumentsOwnedMortgagesResidentialMortgagebackedandAssetbackedSecuritiesatFairValue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Financialinstrumentssubjecttomandatoryredemptioninterestratestatedpercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the agreement.",
        "label": "Financial instruments subject to mandatory redemption, interest rate, stated percentage",
        "terseLabel": "Rate of Return SHLLC"
       }
      }
     },
     "localname": "Financialinstrumentssubjecttomandatoryredemptioninterestratestatedpercentage",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_FinancingCashFlowsForFinanceLeases": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financing cash flows for finance leases",
        "label": "Financing cash flows for finance leases",
        "terseLabel": "Financing cash flows for finance leases"
       }
      }
     },
     "localname": "FinancingCashFlowsForFinanceLeases",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FixedAndVariableFundMaximumAnnualContribution": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum annual contribution that employees can make to the fixed and variable fund benefit. The fixed fund benefit is a benefit that earns a specified rate of interest on contributions made by employees. The variable fund is a benefit that invests employee contributions in the Spartan U.S. Equity Index Fund-Fidelity Advantage Class (Spartan).",
        "label": "Fixed and variable fund maximum annual contribution",
        "terseLabel": "Fixed and variable fund annual maximum contribution"
       }
      }
     },
     "localname": "FixedAndVariableFundMaximumAnnualContribution",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ForwardContractDerivativeAssetatFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value as of the balance sheet date of forward contract derivative assets.",
        "label": "Forward Contract Derivative Asset, at Fair Value",
        "terseLabel": "Forward Contract Derivative Asset, at Fair Value",
        "verboseLabel": "Forward debt securities contracts - asset"
       }
      }
     },
     "localname": "ForwardContractDerivativeAssetatFairValue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FtpTransactionLimit": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "FTP transaction limit",
        "label": "FTP transaction limit",
        "terseLabel": "FTP transaction limit"
       }
      }
     },
     "localname": "FtpTransactionLimit",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FtpUnrealizedGainsLossesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "FTP Unrealized Gains (Losses) [Table Text Block]",
        "label": "FTP Unrealized Gains (Losses) [Table Text Block]",
        "terseLabel": "Financial Trading Program Unrealized Gains (Losses)"
       }
      }
     },
     "localname": "FtpUnrealizedGainsLossesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_FuelCostCapitalizedDuringPreCommercialOperations": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fuel costs incurred during pre-commercial generation capitalized to project costs.",
        "label": "Fuel Cost Capitalized During Pre-Commercial Operations",
        "terseLabel": "Fuel Cost Capitalized During Pre-Commercial Operations"
       }
      }
     },
     "localname": "FuelCostCapitalizedDuringPreCommercialOperations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FuelCostTaxEquivalents": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net change during the period in the amount of tax equivalent payments due to states to replace revenue on properties that were formerly subject to local ad valorem taxation.",
        "label": "Fuel cost tax equivalents",
        "negatedTerseLabel": "Fuel cost tax equivalents"
       }
      }
     },
     "localname": "FuelCostTaxEquivalents",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_FundedStatusThresholdtoReduceMinimumContributionUnder2016ChangestoTVAPensionPlan": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Funded Status Threshold to Reduce Minimum Contribution Under 2016 Changes to TVA Pension Plan",
        "label": "Funded Status Threshold to Reduce Minimum Contribution Under 2016 Changes to TVA Pension Plan",
        "terseLabel": "Funded Status Threshold to Reduce Minimum Contribution Under 2016 Changes to TVA Pension Plan"
       }
      }
     },
     "localname": "FundedStatusThresholdtoReduceMinimumContributionUnder2016ChangestoTVAPensionPlan",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_FutureMinimumLeasePaymentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Future Minimum Lease Payments",
        "label": "Future Minimum Lease Payments [Table Text Block]",
        "terseLabel": "Future Minimum Lease Payments"
       }
      }
     },
     "localname": "FutureMinimumLeasePaymentsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_FuturesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Futures [Domain]",
        "label": "Futures [Domain]",
        "terseLabel": "Futures"
       }
      }
     },
     "localname": "FuturesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_GallatinCCR": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin CCR",
        "label": "Gallatin CCR",
        "terseLabel": "Gallatin CCR"
       }
      }
     },
     "localname": "GallatinCCR",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_GallatinCCRAROincreasedecrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin CCR ARO increase (decrease)",
        "label": "Gallatin CCR ARO increase (decrease)",
        "terseLabel": "Gallatin CCR ARO increase (decrease)"
       }
      }
     },
     "localname": "GallatinCCRAROincreasedecrease",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_GallatinCCRregulatoryasset": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin CCR regulatory asset",
        "label": "Gallatin CCR regulatory asset",
        "terseLabel": "Gallatin CCR regulatory asset",
        "verboseLabel": "Gallatin CCR regulatory asset"
       }
      }
     },
     "localname": "GallatinCCRregulatoryasset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_GallatincoalcombustionresidualfacilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities [Abstract]",
        "label": "Gallatin coal combustion residual facilities [Abstract]",
        "terseLabel": "Gallatin coal combustion residual facilities [Abstract]"
       }
      }
     },
     "localname": "GallatincoalcombustionresidualfacilitiesAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_GallatincoalcombustionresidualfacilitiesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities",
        "label": "Gallatin coal combustion residual facilities [Text Block]",
        "terseLabel": "Gallatin coal combustion residual facilities [Text Block]"
       }
      }
     },
     "localname": "GallatincoalcombustionresidualfacilitiesTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesNotes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_Gallatincoalcombustionresidualfacilitiesestimatedcostrelocateoffsite": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities estimated cost relocate offsite",
        "label": "Gallatin coal combustion residual facilities estimated cost relocate offsite",
        "terseLabel": "Gallatin coal combustion residual facilities estimated cost relocate offsite"
       }
      }
     },
     "localname": "Gallatincoalcombustionresidualfacilitiesestimatedcostrelocateoffsite",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Gallatincoalcombustionresidualfacilitiesestimatedcostrelocateonsite": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities estimated cost to relocate onsite",
        "label": "Gallatin coal combustion residual facilities estimated cost relocate onsite",
        "terseLabel": "Gallatin coal combustion residual facilities estimated cost relocate onsite"
       }
      }
     },
     "localname": "Gallatincoalcombustionresidualfacilitiesestimatedcostrelocateonsite",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Gallatincoalcombustionresidualfacilitiesestimatedcosttocapandclose": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities estimated cost to cap and close",
        "label": "Gallatin coal combustion residual facilities estimated cost to cap and close",
        "terseLabel": "Gallatin coal combustion residual facilities estimated cost to cap and close"
       }
      }
     },
     "localname": "Gallatincoalcombustionresidualfacilitiesestimatedcosttocapandclose",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Gallatincoalcombustionresidualfacilitiesestimatedtimeframetocompletedewateringfacility": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities estimated timeframe to complete dewatering facility",
        "label": "Gallatin coal combustion residual facilities estimated timeframe to complete dewatering facility",
        "terseLabel": "Gallatin coal combustion residual facilities estimated timeframe to complete dewatering facility"
       }
      }
     },
     "localname": "Gallatincoalcombustionresidualfacilitiesestimatedtimeframetocompletedewateringfacility",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "tve_Gallatincoalcombustionresidualfacilitiesoriginalestimatedcostfordewateringfacility": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gallatin coal combustion residual facilities original estimated cost for dewatering facility",
        "label": "Gallatin coal combustion residual facilities original estimated cost for dewatering facility",
        "terseLabel": "Gallatin coal combustion residual facilities original estimated cost for dewatering facility"
       }
      }
     },
     "localname": "Gallatincoalcombustionresidualfacilitiesoriginalestimatedcostfordewateringfacility",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_GeneralAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "General [Abstract]",
        "label": "General [Abstract]",
        "terseLabel": "General [Abstract]"
       }
      }
     },
     "localname": "GeneralAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_GeneralMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "General [Member]",
        "label": "General [Member]",
        "terseLabel": "General"
       }
      }
     },
     "localname": "GeneralMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_GeneralTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "General [Table]",
        "label": "General [Table]",
        "terseLabel": "General"
       }
      }
     },
     "localname": "GeneralTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_HoldcoMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "John Sevier Holdco LLC",
        "label": "Holdco [Member]",
        "terseLabel": "Holdco"
       }
      }
     },
     "localname": "HoldcoMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_HydroPlantMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used in connection with the hydro generation of electricity.",
        "label": "Hydro Plant [Member]",
        "terseLabel": "Hydroelectric"
       }
      }
     },
     "localname": "HydroPlantMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_ImpactOnSecuredBorrowings": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Impact on secured borrowings",
        "label": "Impact on secured borrowings",
        "terseLabel": "Impact on secured borrowings"
       }
      }
     },
     "localname": "ImpactOnSecuredBorrowings",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_IncreaseInAssetRetirementObligationRevisionsInEstimate": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Increase in Asset Retirement Obligation, Revisions in Estimate",
        "label": "Increase in Asset Retirement Obligation, Revisions in Estimate",
        "terseLabel": "Increase in Asset Retirement Obligation, Revisions in Estimate"
       }
      }
     },
     "localname": "IncreaseInAssetRetirementObligationRevisionsInEstimate",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_IncreaseInCCRPostClosureCare": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Increase in CCR post-closure care",
        "label": "Increase in CCR post-closure care",
        "terseLabel": "Increase in CCR post-closure care"
       }
      }
     },
     "localname": "IncreaseInCCRPostClosureCare",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_IncreaseInNDT": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Increase in NDT",
        "label": "Increase in NDT",
        "terseLabel": "Increase in NDT"
       }
      }
     },
     "localname": "IncreaseInNDT",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_IndustriesDirectlyServedMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Industries Directly Served [Member]",
        "label": "Industries Directly Served [Member]",
        "terseLabel": "Industries Directly Served [Member]"
       }
      }
     },
     "localname": "IndustriesDirectlyServedMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_InitialLiabilityRecorded": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total initial liability recorded for environmental agreements. This was deferred as a regulatory asset, after board approval, to collect this amount in rates.",
        "label": "Initial liability recorded",
        "terseLabel": "Initial liability recorded"
       }
      }
     },
     "localname": "InitialLiabilityRecorded",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Initialhealthcarecosttrendrate": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Initial health care cost trend rate",
        "label": "Initial health care cost trend rate",
        "terseLabel": "Initial health care cost trend rate"
       }
      }
     },
     "localname": "Initialhealthcarecosttrendrate",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Institutionalmutualfunds": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value measurements of institutional mutual funds that are classified based on their existing investment portfolio as of the measurement date.",
        "label": "Institutional mutual funds",
        "terseLabel": "Institutional mutual funds"
       }
      }
     },
     "localname": "Institutionalmutualfunds",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_InsurancePolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of the accounting policy for insurance. The policy includes the types of insurance purchased as well as the accounting treatment of the costs.",
        "label": "Insurance [Policy Text Block]",
        "terseLabel": "Insurance"
       }
      }
     },
     "localname": "InsurancePolicyTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_InterestPaymentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Energy prepayment interest payments",
        "label": "Interest Payments [Member]",
        "terseLabel": "Interest Payments relating to energy prepayment obligations"
       }
      }
     },
     "localname": "InterestPaymentsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_InvestmentInEnergyEfficiencyProjects": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Required investment in energy efficiency projects.",
        "label": "Investment in energy efficiency projects",
        "terseLabel": "Investment in environmental agreement projects"
       }
      }
     },
     "localname": "InvestmentInEnergyEfficiencyProjects",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_JsccgMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "John Sevier Combined Cycle Generation LLC",
        "label": "JSCCG [Member]",
        "terseLabel": "JSCCG"
       }
      }
     },
     "localname": "JsccgMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_LTDCPMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Long term deferred compensation plan (\"LTDCP\") is designed to provide long-term incentives to executives to encourage them to stay with TVA and to provide competitive levels of total compensation to such executives.",
        "label": "LTDCP [Member]",
        "verboseLabel": "LTDCP"
       }
      }
     },
     "localname": "LTDCPMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_LeaseAssetsObtainedInExchangeForLeaseObligationsFinance": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease assets obtained in exchange for lease obligations - finance",
        "label": "Lease assets obtained in exchange for lease obligations - finance",
        "terseLabel": "Lease assets obtained in exchange for lease obligations - finance"
       }
      }
     },
     "localname": "LeaseAssetsObtainedInExchangeForLeaseObligationsFinance",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LeaseAssetsObtainedInExchangeForLeaseObligationsOperating": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease assets obtained in exchange for lease obligations - operating",
        "label": "Lease assets obtained in exchange for lease obligations - operating",
        "terseLabel": "Lease assets obtained in exchange for lease obligations - operating"
       }
      }
     },
     "localname": "LeaseAssetsObtainedInExchangeForLeaseObligationsOperating",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LeaseCostsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease Costs",
        "label": "Lease Costs [Table Text Block]",
        "terseLabel": "Lease Costs"
       }
      }
     },
     "localname": "LeaseCostsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_LeaseLeasebacksAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease/Leasebacks [Abstract]",
        "label": "Lease/Leasebacks [Abstract]",
        "terseLabel": "Lease/Leasebacks [Abstract]"
       }
      }
     },
     "localname": "LeaseLeasebacksAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_LeaseSoCFTableTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease SoCF table [Table]",
        "label": "Lease SoCF table [Table]",
        "terseLabel": "Lease SoCF table [Table]"
       }
      }
     },
     "localname": "LeaseSoCFTableTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LeasebackTransactionNumberOfUnits": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of units involved in leaseback transactions.",
        "label": "Leaseback transaction, number of units",
        "terseLabel": "Leaseback transaction, number of units"
       }
      }
     },
     "localname": "LeasebackTransactionNumberOfUnits",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Leasebackobligationsettledasaresultofacquisition": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leaseback obligation settled as a result of acquisition",
        "label": "Leaseback obligation settled as a result of acquisition",
        "terseLabel": "Leaseback obligation settled as a result of acquisition"
       }
      }
     },
     "localname": "Leasebackobligationsettledasaresultofacquisition",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LeasesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases [Axis]",
        "label": "Leases [Axis]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "LeasesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LeasesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases [Domain]",
        "label": "Leases [Domain]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "LeasesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_LeasesFutureMinimumPaymentsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases - Future Minimum Payments [Table]",
        "label": "Leases - Future Minimum Payments [Table]",
        "terseLabel": "Leases - Future Minimum Payments [Table]"
       }
      }
     },
     "localname": "LeasesFutureMinimumPaymentsTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LeasesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases [Line Items]",
        "label": "Leases [Line Items]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "LeasesLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesLeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LeasesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases [Table]",
        "label": "Leases [Table]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "LeasesTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesLeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LeasesWeightedAveragesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leases - Weighted Averages [Table]",
        "label": "Leases - Weighted Averages [Table]",
        "terseLabel": "Leases - Weighted Averages [Table]"
       }
      }
     },
     "localname": "LeasesWeightedAveragesTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LetterofCreditOutstandingAmount2": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 2.",
        "label": "Letter of Credit Outstanding, Amount 2",
        "terseLabel": "Letter of Credit Outstanding, Amount 2"
       }
      }
     },
     "localname": "LetterofCreditOutstandingAmount2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LettersofCreditOutstandingAmount1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 1.",
        "label": "Letters of Credit Outstanding, Amount 1",
        "terseLabel": "Letters of Credit Outstanding, Amount 1"
       }
      }
     },
     "localname": "LettersofCreditOutstandingAmount1",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LettersofCreditOutstandingAmount3": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 3.",
        "label": "Letters of Credit Outstanding, Amount 3",
        "terseLabel": "Letters of Credit Outstanding, Amount 3"
       }
      }
     },
     "localname": "LettersofCreditOutstandingAmount3",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LettersofCreditOutstandingAmount4": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 4.",
        "label": "Letters of Credit Outstanding, Amount 4",
        "terseLabel": "Letters of Credit Outstanding, Amount 4"
       }
      }
     },
     "localname": "LettersofCreditOutstandingAmount4",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LiabilitiesAndProprietaryCapital": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all Liabilities and Proprietary Capital items.",
        "label": "Liabilities And Proprietary Capital",
        "totalLabel": "Total liabilities and proprietary capital"
       }
      }
     },
     "localname": "LiabilitiesAndProprietaryCapital",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LiabilitiesAndProprietaryCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "LIABILITIES AND PROPRIETARY CAPITAL [Abstract]",
        "verboseLabel": "LIABILITIES AND PROPRIETARY CAPITAL"
       }
      }
     },
     "localname": "LiabilitiesAndProprietaryCapitalAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_LineofCreditFacilityRemainingBorrowingCapacity1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 1.",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity 1",
        "terseLabel": "Line of Credit Facility, Remaining Borrowing Capacity 1"
       }
      }
     },
     "localname": "LineofCreditFacilityRemainingBorrowingCapacity1",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LineofCreditFacilityRemainingBorrowingCapacity2": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 2.",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity 2",
        "terseLabel": "Line of Credit Facility, Remaining Borrowing Capacity 2"
       }
      }
     },
     "localname": "LineofCreditFacilityRemainingBorrowingCapacity2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LineofCreditFacilityRemainingBorrowingCapacity3": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 3.",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity 3",
        "terseLabel": "Line of Credit Facility, Remaining Borrowing Capacity 3"
       }
      }
     },
     "localname": "LineofCreditFacilityRemainingBorrowingCapacity3",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LineofCreditFacilityRemainingBorrowingCapacity4": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 4.",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity 4",
        "terseLabel": "Line of Credit Facility, Remaining Borrowing Capacity 4"
       }
      }
     },
     "localname": "LineofCreditFacilityRemainingBorrowingCapacity4",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Loansandotherlongtermreceivables": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Loans and other long-term receivables",
        "label": "Loans and other long-term receivables",
        "terseLabel": "Loans and other long-term receivables"
       }
      }
     },
     "localname": "Loansandotherlongtermreceivables",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LocalPowerCompanyMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local Power Company [Member]",
        "label": "Local Power Company [Member]",
        "terseLabel": "Local Power Company [Member]"
       }
      }
     },
     "localname": "LocalPowerCompanyMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_LongTermPowerBonds": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_UnsecuredLongTermDebt",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion and excluding the unamortized discount, premiums and other.",
        "label": "Long-term power bonds",
        "terseLabel": "Long-term power bonds"
       }
      }
     },
     "localname": "LongTermPowerBonds",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LongtermLineofCreditBorrowings1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of the amount under the credit facility 1 (cash borrowings).",
        "label": "Long-term Line of Credit, Borrowings 1",
        "terseLabel": "Long-term Line of Credit, Borrowings 1"
       }
      }
     },
     "localname": "LongtermLineofCreditBorrowings1",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LongtermLineofCreditBorrowings2": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. (For cash borrowings on facility 2).",
        "label": "Long-term Line of Credit, Borrowings 2",
        "terseLabel": "Long-term Line of Credit, Borrowings 2"
       }
      }
     },
     "localname": "LongtermLineofCreditBorrowings2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LongtermLineofCreditBorrowings3": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. (For cash borrowings on facility 3).",
        "label": "Long-term Line of Credit, Borrowings 3",
        "terseLabel": "Long-term Line of Credit, Borrowings 3"
       }
      }
     },
     "localname": "LongtermLineofCreditBorrowings3",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_LongtermLineofCreditBorrowings4": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. (For cash borrowings on facility 4).",
        "label": "Long-term Line of Credit, Borrowings 4",
        "terseLabel": "Long-term Line of Credit, Borrowings 4"
       }
      }
     },
     "localname": "LongtermLineofCreditBorrowings4",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_MLGWsofoperatingrevenues": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "MLGW's % of operating revenues",
        "label": "MLGW's % of operating revenues",
        "terseLabel": "MLGW's % of operating revenues"
       }
      }
     },
     "localname": "MLGWsofoperatingrevenues",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_MarketRelatedValuePhaseInPeriodNumberOfYears": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of years for the phase-in period in which the impact of asset performance on pension expense is phased-in through a market-related value of asset calculation.",
        "label": "Market-related value phase-in period number of years",
        "terseLabel": "Market-related value phase-in period number of years"
       }
      }
     },
     "localname": "MarketRelatedValuePhaseInPeriodNumberOfYears",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_MarketValueLimitationOfOutstandingConstructionMaterialsHedgingTransactions": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The market value limitation of outstanding hedging transactions involving construction materials.",
        "label": "Market value limitation of outstanding construction materials hedging transactions",
        "terseLabel": "Market value limitation of outstanding construction materials hedging transactions"
       }
      }
     },
     "localname": "MarketValueLimitationOfOutstandingConstructionMaterialsHedgingTransactions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_MaturitiesDueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maturities Due [Abstract]",
        "label": "Maturities Due [Abstract]",
        "terseLabel": "Maturities Due [Abstract]"
       }
      }
     },
     "localname": "MaturitiesDueAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_MaxYearstoClose": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Max Years to Close",
        "label": "Max Years to Close",
        "terseLabel": "Max Years to Close"
       }
      }
     },
     "localname": "MaxYearstoClose",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "tve_MaximumAssessmentPerNuclearIncident": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum assessment per nuclear incident.",
        "label": "Maximum assessment per nuclear incident",
        "terseLabel": "Maximum assessment per nuclear incident"
       }
      }
     },
     "localname": "MaximumAssessmentPerNuclearIncident",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_MaximumHedgeVolume": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum hedge volume for construction material transactions.",
        "label": "Maximum hedge volume",
        "terseLabel": "Maximum hedge volume"
       }
      }
     },
     "localname": "MaximumHedgeVolume",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum idemnity per unit if an accident covered by the policy tasks or keeps a nuclear unit offline.",
        "label": "Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline",
        "terseLabel": "Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline"
       }
      }
     },
     "localname": "MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_MaximumPaymentRequiredPerAccidentInAnyOneYear": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum payment that would be required per accident in any one year.",
        "label": "Maximum payment required per accident in any one year",
        "terseLabel": "Maximum payment required per accident in any one year"
       }
      }
     },
     "localname": "MaximumPaymentRequiredPerAccidentInAnyOneYear",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Maximumamountofretrospectivepremiums": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum amount of retrospective premiums that may be required for property, decommissioning, and decontamination insurance.",
        "label": "Maximum amount of retrospective premiums",
        "terseLabel": "Maximum amount of retrospective premiums"
       }
      }
     },
     "localname": "Maximumamountofretrospectivepremiums",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Maximumoriginalmaturity": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum original maturity",
        "label": "Maximum original maturity",
        "terseLabel": "Maximum original maturity"
       }
      }
     },
     "localname": "Maximumoriginalmaturity",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Maximumtermlengthforthepurchasestorageandtransportationofnaturalgas": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum term length for the purchase, storage, and transportation of natural gas",
        "label": "Maximum term length for the purchase, storage, and transportation of natural gas",
        "terseLabel": "Maximum term length for the purchase, storage, and transportation of natural gas"
       }
      }
     },
     "localname": "Maximumtermlengthforthepurchasestorageandtransportationofnaturalgas",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Megawatts": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Megawatts of summer net capability",
        "label": "Megawatts",
        "terseLabel": "Megawatts",
        "verboseLabel": "Megawatts option 1"
       }
      }
     },
     "localname": "Megawatts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_MegawattsOption2": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Megawatts option 2",
        "label": "Megawatts option 2",
        "terseLabel": "Megawatts option 2"
       }
      }
     },
     "localname": "MegawattsOption2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_MegawattsProvidedUnderPowerPurchaseObligations": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of megawatts provided under the power purchase obligations.",
        "label": "Megawatts provided under power purchase obligations",
        "terseLabel": "Megawatts provided under power purchase obligations"
       }
      }
     },
     "localname": "MegawattsProvidedUnderPowerPurchaseObligations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Megawattsprovidedundertransmissionobligations": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Megawatts provided under transmission obligations",
        "label": "Megawatts provided under transmission obligations",
        "terseLabel": "Megawatts provided under transmission obligations"
       }
      }
     },
     "localname": "Megawattsprovidedundertransmissionobligations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_MinimumFundingforTVAPensionPlanUnder2016Amendments": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum Funding for TVA Pension Plan Under 2016 Changes",
        "label": "Minimum Funding for TVA Pension Plan Under 2016 Amendments",
        "terseLabel": "Minimum Funding for TVA Pension Plan Under 2016 Amendments"
       }
      }
     },
     "localname": "MinimumFundingforTVAPensionPlanUnder2016Amendments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Minimuminvestmentperiod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum investment period of private partnership investments.",
        "label": "Minimum investment period",
        "terseLabel": "Minimum investment period"
       }
      }
     },
     "localname": "Minimuminvestmentperiod",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinnexttwelvemonths": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum payments on membership interests subject to mandatory redemption, due in next twelve months",
        "label": "Minimum payments on membership interests subject to mandatory redemption, due in next twelve months",
        "terseLabel": "Minimum payments on membership interests subject to mandatory redemption, due in next twelve months"
       }
      }
     },
     "localname": "Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinnexttwelvemonths",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearfive": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum payments on membership interests subject to mandatory redemption, due in year five",
        "label": "Minimum payments on membership interests subject to mandatory redemption, due in year five",
        "terseLabel": "Minimum payments on membership interests subject to mandatory redemption, due in year five"
       }
      }
     },
     "localname": "Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearfive",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearfour": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum payments on membership interests subject to mandatory redemption, due in year four",
        "label": "Minimum payments on membership interests subject to mandatory redemption, due in year four",
        "terseLabel": "Minimum payments on membership interests subject to mandatory redemption, due in year four"
       }
      }
     },
     "localname": "Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearfour",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearthree": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum payments on membership interests subject to mandatory redemption, due in year three",
        "label": "Minimum payments on membership interests subject to mandatory redemption, due in year three",
        "terseLabel": "Minimum payments on membership interests subject to mandatory redemption, due in year three"
       }
      }
     },
     "localname": "Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyearthree",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyeartwo": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum payments on membership interests subject to mandatory redemption, due in year two",
        "label": "Minimum payments on membership interests subject to mandatory redemption, due in year two",
        "terseLabel": "Minimum payments on membership interests subject to mandatory redemption, due in year two"
       }
      }
     },
     "localname": "Minimumpaymentsonmembershipinterestssubjecttomandatoryredemptiondueinyeartwo",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_MlgwMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "MLGW [Member]",
        "label": "MLGW [Member]",
        "terseLabel": "MLGW"
       }
      }
     },
     "localname": "MlgwMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_MultipurposeDamsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Multipurpose Dams [Member]",
        "label": "Multipurpose Dams [Member]",
        "terseLabel": "Multipurpose dams"
       }
      }
     },
     "localname": "MultipurposeDamsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NESsofoperatingrevenues": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "NES's % of operating revenues",
        "label": "NES's % of operating revenues",
        "terseLabel": "NES's % of operating revenues"
       }
      }
     },
     "localname": "NESsofoperatingrevenues",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_NaturalGasSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Natural Gas Swap [Member]",
        "label": "Natural Gas Swap [Member]",
        "terseLabel": "Natural Gas Swap"
       }
      }
     },
     "localname": "NaturalGasSwapMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NdtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nuclear Decommissioning Trust. The NDT holds funds for the ultimate decommissioning of TVA's nuclear power plants. The NDT is composed of multiple types of investments and is managed by external institutional managers.",
        "label": "NDT [Member]",
        "terseLabel": "NDT"
       }
      }
     },
     "localname": "NdtMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NetBookValueandrelatedAROsofAssetsSold": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net Book Value and related ARO's of Assets Sold",
        "label": "Net Book Value and related ARO's of Assets Sold",
        "terseLabel": "Net Book Value and related ARO's of Assets Sold"
       }
      }
     },
     "localname": "NetBookValueandrelatedAROsofAssetsSold",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NetCompletedPlant": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period end amount of property, plant and equipment (PPE) related to utility distribution less the cumulative amount of depreciation, depletion and amortization related to PPE that has been recognized in the Income Statement.",
        "label": "Net completed plant",
        "terseLabel": "Net completed plant",
        "totalLabel": "Net completed plant"
       }
      }
     },
     "localname": "NetCompletedPlant",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NetEffectOnEarnings": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net effect on earnings resulting from the combination of amounts reclassified from other comprehensive income to earnings as well as the exchange gain/loss on debt.",
        "label": "Net effect on earnings",
        "terseLabel": "Net effect on earnings"
       }
      }
     },
     "localname": "NetEffectOnEarnings",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NetPayables": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net payables associated with security purchases and sales and various other payables.",
        "label": "Net payables",
        "terseLabel": "Net payables"
       }
      }
     },
     "localname": "NetPayables",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NetPeriodicBenefitAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net Periodic Benefit",
        "label": "Net Periodic Benefit [Axis]",
        "terseLabel": "Net Periodic Benefit [Axis]"
       }
      }
     },
     "localname": "NetPeriodicBenefitAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_NetPeriodicBenefitCostAsAcutariallyDetermined": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of net periodic benefit cost actuarilly determined for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.",
        "label": "Net periodic benefit cost as acutarially determined",
        "totalLabel": "Net periodic benefit cost as acutarially determined"
       }
      }
     },
     "localname": "NetPeriodicBenefitCostAsAcutariallyDetermined",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NetPeriodicBenefitDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Domain] for Net Periodic Benefit",
        "label": "Net Periodic Benefit [Domain]",
        "terseLabel": "Net Periodic Benefit [Domain]"
       }
      }
     },
     "localname": "NetPeriodicBenefitDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NetTransfersFromVariableFund401KPlan": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net transfers from employee variable funds or 401 (k) plans to pension and postretirement benefit plans.",
        "label": "Net transfers from variable fund/401(k) plan",
        "terseLabel": "Net transfers from variable fund/401(k) plan"
       }
      }
     },
     "localname": "NetTransfersFromVariableFund401KPlan",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NonCashFinancingActivities": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-cash financing activities",
        "label": "Non-cash financing activities",
        "terseLabel": "Non-cash financing activities"
       }
      }
     },
     "localname": "NonCashFinancingActivities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NonCashInvestingActivities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-cash investing activities",
        "label": "Non-cash investing activities",
        "terseLabel": "Non-cash investing activities"
       }
      }
     },
     "localname": "NonCashInvestingActivities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NonNuclearClosedActivitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-nuclear Closed Activities",
        "label": "Non-nuclear Closed Activities [Member]",
        "terseLabel": "Non-nuclear Closed Activities [Member]"
       }
      }
     },
     "localname": "NonNuclearClosedActivitiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonNuclearDecommissioningMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Costs provided for the retirement of certain non-nuclear long-lived assets that are reasonably expected to be recovered in rates charged to customers. Regulatory asset or liability is recognized for differences in the timing of recognition of the period costs for financial reporting and rate-making purposes.",
        "label": "Non-nuclear decommissioning [Member]",
        "terseLabel": "Non-nuclear decommissioning costs"
       }
      }
     },
     "localname": "NonNuclearDecommissioningMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonNuclearMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-nuclear [Member]",
        "label": "Non-nuclear [Member]",
        "terseLabel": "Non-nuclear"
       }
      }
     },
     "localname": "NonNuclearMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonNuclearOperatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-nuclear Operating",
        "label": "Non-nuclear Operating [Member]",
        "terseLabel": "Non-nuclear Operating [Member]"
       }
      }
     },
     "localname": "NonNuclearOperatingMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonnuclearActiveProjectsRevisionsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-nuclear - Active Projects Revisions",
        "label": "Non-nuclear - Active Projects Revisions [Member]",
        "terseLabel": "Non-nuclear - Active Projects Revisions"
       }
      }
     },
     "localname": "NonnuclearActiveProjectsRevisionsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonnuclearClosureMethodRevisionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Non-nuclear - Closure Method Revision [Member]",
        "label": "Non-nuclear - Closure Method Revision [Member]",
        "terseLabel": "Non-nuclear - Closure Method Revision"
       }
      }
     },
     "localname": "NonnuclearClosureMethodRevisionMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonperformanceRiskAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nonperformance Risk [Abstract]",
        "label": "Nonperformance Risk [Abstract]",
        "terseLabel": "Nonperformance Risk [Abstract]"
       }
      }
     },
     "localname": "NonperformanceRiskAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_NonpowerProgramsAppropriationInvestmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nonpower Programs Appropriation Investment [Member]",
        "label": "Nonpower Programs Appropriation Investment [Member]",
        "terseLabel": "Nonpower Programs Appropriation Investment"
       }
      }
     },
     "localname": "NonpowerProgramsAppropriationInvestmentMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonpowerProgramsAppropriationInvestmentNetMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nonpower Programs Appropriation Investment, Net",
        "label": "Nonpower Programs Appropriation Investment, Net [Member]",
        "terseLabel": "Nonpower Programs Appropriation Investment, Net"
       }
      }
     },
     "localname": "NonpowerProgramsAppropriationInvestmentNetMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NonpowerProgramsRetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nonpower Programs Retained Earnings [Member]",
        "label": "Nonpower Programs Retained Earnings [Member]",
        "terseLabel": "Nonpower Programs Retained Earnings"
       }
      }
     },
     "localname": "NonpowerProgramsRetainedEarningsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NuclearAccidentAssessmentLimitationPerYearPerUnit": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The per year per unit limitation of the assessment for any nuclear accident",
        "label": "Nuclear accident assessment limitation per year per unit",
        "terseLabel": "Nuclear accident assessment limitation per year per unit"
       }
      }
     },
     "localname": "NuclearAccidentAssessmentLimitationPerYearPerUnit",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NuclearDecommissioningFundInvestmentsFairValue": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning nuclear facilities.",
        "label": "Nuclear Decommissioning Fund Investments, Fair Value",
        "terseLabel": "Balance in the NDT"
       }
      }
     },
     "localname": "NuclearDecommissioningFundInvestmentsFairValue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NuclearDesommissioningCostsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nuclear decommissioning costs include: 1) certain deferred charges related to the future closure and decommissioning of TVA's nuclear generating units under the NRC requirements and 2) recognition of changes in the liability, TVA's nuclear decommissioning trust, and certain other deferred charges under the accounting rules for AROs.",
        "label": "Nuclear desommissioning costs [Member]",
        "terseLabel": "Nuclear decommissioning costs"
       }
      }
     },
     "localname": "NuclearDesommissioningCostsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NuclearLiabilityInsurance": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For the first layer of protection all NRC nuclear plant licensees purchase nuclear insurance from American Nuclear Insurers for each nuclear plant with an operating license.",
        "label": "Nuclear liability insurance",
        "terseLabel": "Nuclear liability insurance"
       }
      }
     },
     "localname": "NuclearLiabilityInsurance",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_NuclearMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nuclear [Member]",
        "label": "Nuclear [Member]",
        "terseLabel": "Nuclear"
       }
      }
     },
     "localname": "NuclearMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_NumberOfActiveFutureCommissionMerchants": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of active future commission merchants to clear commodity contracts.",
        "label": "Number of active future commission merchants",
        "terseLabel": "Number of active future commission merchants"
       }
      }
     },
     "localname": "NumberOfActiveFutureCommissionMerchants",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfBritishPoundStrelingDenominatedBondTransactions": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of British pound streling denominated bond transactions",
        "label": "Number of British pound streling denominated bond transactions",
        "verboseLabel": "Number of British pound sterling denominated bond transactions"
       }
      }
     },
     "localname": "NumberOfBritishPoundStrelingDenominatedBondTransactions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfEnvironmentalAgreementsEnteredIntoWithEpa": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of environmental agreements entered into with the EPA",
        "label": "Number of environmental agreements entered into with the EPA",
        "terseLabel": "Number of environmental agreements entered into with the EPA"
       }
      }
     },
     "localname": "NumberOfEnvironmentalAgreementsEnteredIntoWithEpa",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfGenerationSourcesUnderPPAs": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of generation sources under PPAs",
        "label": "Number of generation sources under PPAs",
        "terseLabel": "Number of generation sources under PPAs"
       }
      }
     },
     "localname": "NumberOfGenerationSourcesUnderPPAs",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfLPCsSignedFlexibilityAgreement": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of LPCs signed Flexibility Agreement",
        "label": "Number of LPCs signed Flexibility Agreement",
        "terseLabel": "Number of LPCs signed Flexibility Agreement"
       }
      }
     },
     "localname": "NumberOfLPCsSignedFlexibilityAgreement",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfLPCsSignedLTA": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of LPCs signed LTA",
        "label": "Number of LPCs signed LTA",
        "terseLabel": "Number of LPCs signed LTA"
       }
      }
     },
     "localname": "NumberOfLPCsSignedLTA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfLicensedNuclearUnits": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of licensed nuclear units owned.",
        "label": "Number of licensed nuclear units",
        "terseLabel": "Number of licensed nuclear units"
       }
      }
     },
     "localname": "NumberOfLicensedNuclearUnits",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfParticipantsThatFiledSuit": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of participants that filed suit.",
        "label": "Number of participants that filed suit",
        "terseLabel": "Number of participants that filed suit"
       }
      }
     },
     "localname": "NumberOfParticipantsThatFiledSuit",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfProceduresForDeterminingEstimatesForCostsOfNuclearDecommissioning": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of procedures for determining estimates for the costs of nuclear decommissioning",
        "label": "Number of procedures for determining estimates for the costs of nuclear decommissioning",
        "terseLabel": "Number of procedures for determining estimates for the costs of nuclear decommissioning"
       }
      }
     },
     "localname": "NumberOfProceduresForDeterminingEstimatesForCostsOfNuclearDecommissioning",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfReadilyAvailableQuotedExchangePricesForInvestments": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of readily available quoted exchange prices for the investments",
        "label": "Number of readily available quoted exchange prices for the investments",
        "terseLabel": "Number of readily available quoted exchange prices for the investments"
       }
      }
     },
     "localname": "NumberOfReadilyAvailableQuotedExchangePricesForInvestments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfRevolvingCreditFacilities": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of revolving credit facilities.",
        "label": "Number of revolving credit facilities",
        "terseLabel": "Number of revolving credit facilities"
       }
      }
     },
     "localname": "NumberOfRevolvingCreditFacilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfSimilarEnvironmentalAgreementsEnteredInto": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of similar environmental agreements entered into",
        "label": "Number of similar environmental agreements entered into",
        "terseLabel": "Number of similar environmental agreements entered into"
       }
      }
     },
     "localname": "NumberOfSimilarEnvironmentalAgreementsEnteredInto",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_NumberOfUnitsToBeIdled": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of units to be idled.",
        "label": "Number of units to be idled",
        "terseLabel": "Number of units to be idled"
       }
      }
     },
     "localname": "NumberOfUnitsToBeIdled",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberenvironmentaladvocacygroupswithwhichthereisanenvironmentalagreement.": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number environmental advocacy groups with which there is an environmental agreement.",
        "label": "Number environmental advocacy groups with which there is an environmental agreement.",
        "terseLabel": "Number of environmental agreements entered into with environmental advocacy groups"
       }
      }
     },
     "localname": "Numberenvironmentaladvocacygroupswithwhichthereisanenvironmentalagreement.",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberofcustomersforwhomunbilledrevenuesareestimated": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of customers for whom unbilled revenues are estimated.",
        "label": "Number of customers for whom unbilled revenues are estimated",
        "terseLabel": "Number of customers for whom unbilled revenues are estimated"
       }
      }
     },
     "localname": "Numberofcustomersforwhomunbilledrevenuesareestimated",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberofcustomersthatrepresentthepercentofsales": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of customers that represent the percent of sales",
        "label": "Number of customers that represent the percent of sales",
        "terseLabel": "Number of customers that represent the percent of sales"
       }
      }
     },
     "localname": "Numberofcustomersthatrepresentthepercentofsales",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberofdaysindefault": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of days in default that are determined to be uncollectible.",
        "label": "Number of days in default",
        "terseLabel": "Number of days in default"
       }
      }
     },
     "localname": "Numberofdaysindefault",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_NumberoflicensedreactorsinUS": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of licensed reactors in US.",
        "label": "Number of licensed reactors in US",
        "terseLabel": "Number of licensed reactors in US"
       }
      }
     },
     "localname": "NumberoflicensedreactorsinUS",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberofoneyearextensionsforpartnershipsinprivateequity": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of one year extensions for partnerships in private equity stated in a range.",
        "label": "Number of one year extensions for partnerships in private equity",
        "terseLabel": "Number of one year extensions for partnerships in private equity"
       }
      }
     },
     "localname": "Numberofoneyearextensionsforpartnershipsinprivateequity",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_Numberofyearspartnershipsinprivateequitygenerallycontinue": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of years partnerships in private equity generally continue stated in a range.",
        "label": "Number of years partnerships in private equity generally continue",
        "terseLabel": "Number of years partnerships in private equity generally continue"
       }
      }
     },
     "localname": "Numberofyearspartnershipsinprivateequitygenerallycontinue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_ObligationsAndFundedStatusAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Obligations and Funded Status [Abstract]",
        "label": "Obligations and Funded Status [Abstract]",
        "terseLabel": "Obligations and Funded Status [Abstract]"
       }
      }
     },
     "localname": "ObligationsAndFundedStatusAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_OffsettingAssetsandLiabilitiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Disclosure of information about derivative and financial assets and liabilities that are subject to offsetting, including enforceable master netting arrangements.",
        "label": "Offsetting Assets and Liabilities [Table Text Block]",
        "terseLabel": "Offsetting Assets and Liabilities"
       }
      }
     },
     "localname": "OffsettingAssetsandLiabilitiesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_Offsystemsales": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Off-system sales",
        "label": "Off-system sales",
        "terseLabel": "Off-system sales"
       }
      }
     },
     "localname": "Offsystemsales",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OperatingCashFlowsForFinanceLeases": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating cash flows for finance leases",
        "label": "Operating cash flows for finance leases",
        "terseLabel": "Operating cash flows for finance leases"
       }
      }
     },
     "localname": "OperatingCashFlowsForFinanceLeases",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OperatingCashFlowsForOperatingLeases": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating cash flows for operating leases",
        "label": "Operating cash flows for operating leases",
        "terseLabel": "Operating cash flows for operating leases"
       }
      }
     },
     "localname": "OperatingCashFlowsForOperatingLeases",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesSoCFDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OperatingLeaseLiabilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating lease liability",
        "label": "Operating lease liability [Member]",
        "terseLabel": "Operating lease liability"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OperatingLeaseUnderPPA": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating lease under PPA",
        "label": "Operating lease under PPA",
        "terseLabel": "Operating lease under PPA"
       }
      }
     },
     "localname": "OperatingLeaseUnderPPA",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OperatingPresentValueOfNetMinimumLeasePayments": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating present value of net minimum lease payments",
        "label": "Operating present value of net minimum lease payments",
        "terseLabel": "Operating present value of net minimum lease payments"
       }
      }
     },
     "localname": "OperatingPresentValueOfNetMinimumLeasePayments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OpportunisticfixedincomeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Opportunistic fixed income [Member]",
        "label": "Opportunistic fixed income [Member]",
        "terseLabel": "Opportunistic fixed income"
       }
      }
     },
     "localname": "OpportunisticfixedincomeMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherIncomeAndExpenseAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Income and Expense [Axis]",
        "label": "Other Income and Expense [Axis]",
        "terseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "OtherIncomeAndExpenseAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherIncomeAndExpenseTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provides a description and amount of each detailed component of other nonoperating income and other nonoperating expense. May include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items, (e) losses on securities (net of profits), and (f) miscellaneous income deductions.",
        "label": "Other Income and Expense [Table]",
        "terseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "OtherIncomeAndExpenseTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherIncomeAndExpenseTypesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Income and Expense Types [Domain]",
        "label": "Other Income and Expense Types [Domain]",
        "terseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "OtherIncomeAndExpenseTypesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherLongTermAssetsAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Assets [Axis]",
        "label": "Other Long-Term Assets [Axis]",
        "terseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "OtherLongTermAssetsAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherLongTermAssetsDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Assets [Domain]",
        "label": "Other Long-Term Assets [Domain]",
        "terseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "OtherLongTermAssetsDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherLongTermAssetsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Assets [Line Items]",
        "label": "Other Long-Term Assets [Line Items]",
        "terseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "OtherLongTermAssetsLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherLongTermAssetsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Assets [Table]",
        "label": "Other Long-Term Assets [Table]",
        "terseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "OtherLongTermAssetsTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherLongTermLiabilitiesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Liabilities [Axis]",
        "label": "Other Long-Term Liabilities [Axis]",
        "verboseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherLongTermLiabilitiesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherLongTermLiabilitiesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Liabilities [Domain]",
        "label": "Other Long-Term Liabilities [Domain]",
        "verboseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherLongTermLiabilitiesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherLongTermLiabilitiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Liabilities [Line Items]",
        "label": "Other Long-Term Liabilities [Line Items]",
        "terseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherLongTermLiabilitiesLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherLongTermLiabilitiesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Long-Term Liabilities [Table]",
        "label": "Other Long-Term Liabilities [Table]",
        "terseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherLongTermLiabilitiesTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherNonCurrentRegulatoryAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other non-current regulatory assets that aren't detailed in the table.",
        "label": "Other non-current regulatory assets [Member]",
        "terseLabel": "Regulatory Asset"
       }
      }
     },
     "localname": "OtherNonCurrentRegulatoryAssetsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherPostEmploymentBenefitsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Post-employment Benefits [Abstract]",
        "label": "Other Post-Employment Benefits [Abstract]",
        "terseLabel": "Other Post-Employment Benefits [Abstract]"
       }
      }
     },
     "localname": "OtherPostEmploymentBenefitsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_OtherPostEmploymentBenefitsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Post-Employment Benefits [Line Items]",
        "label": "Other Post-Employment Benefits [Line Items]",
        "terseLabel": "Other Post-Employment Benefits"
       }
      }
     },
     "localname": "OtherPostEmploymentBenefitsLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherPostEmploymentBenefitsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Post-Employment Benefits",
        "label": "Other Post-Employment Benefits [Table]",
        "terseLabel": "Other Post-Employment Benefits"
       }
      }
     },
     "localname": "OtherPostEmploymentBenefitsTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_OtherStewardshipMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Stewardship [Member]",
        "label": "Other Stewardship [Member]",
        "terseLabel": "Other stewardship"
       }
      }
     },
     "localname": "OtherStewardshipMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherSubtotalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Subtotal [Member]",
        "label": "Other Subtotal [Member]",
        "terseLabel": "Other Subtotal"
       }
      }
     },
     "localname": "OtherSubtotalMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_OtherUnsecuredDebt": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Including the current and noncurrent portions, carrying value as of the balance sheet date of other forms of uncollateralized debt obligations not elsewhere specified in the taxonomy(with maturities initially due after one year or beyond the operating cycle if longer).",
        "label": "Other Unsecured Debt",
        "terseLabel": "Long-term power bonds, net"
       }
      }
     },
     "localname": "OtherUnsecuredDebt",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OthercommitmentsunfundedloancommitmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other commitments - unfunded loan commitments [Abstract]",
        "label": "Other commitments - unfunded loan commitments [Abstract]",
        "terseLabel": "Other commitments - unfunded loan commitments [Abstract]"
       }
      }
     },
     "localname": "OthercommitmentsunfundedloancommitmentsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_OthercurrentregulatoryassetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other current regulatory assets [Member]",
        "label": "Other current regulatory assets [Member]",
        "terseLabel": "Other current regulatory assets"
       }
      }
     },
     "localname": "OthercurrentregulatoryassetsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Otherliabilitycontracts": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value as of the balance sheet date of derivative liability instruments whose primary underlying risks are not otherwise detailed in this disclosure.",
        "label": "Other liability contracts",
        "terseLabel": "Swap contracts"
       }
      }
     },
     "localname": "Otherliabilitycontracts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_OtherlongtermdebtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other long-term debt",
        "label": "Other long-term debt [Member]",
        "terseLabel": "Other long-term debt"
       }
      }
     },
     "localname": "OtherlongtermdebtMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Otherrevenue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 2.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other revenue",
        "label": "Other revenue",
        "terseLabel": "Other revenue"
       }
      }
     },
     "localname": "Otherrevenue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PaidToStatesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Paid to States [Member]",
        "label": "Paid to States [Member]",
        "terseLabel": "Paid to States"
       }
      }
     },
     "localname": "PaidToStatesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PandemicReliefCredit": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Pandemic Relief Credit",
        "label": "Pandemic Relief Credit",
        "terseLabel": "Pandemic Relief Credit"
       }
      }
     },
     "localname": "PandemicReliefCredit",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ParadiseAROincreasedecrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Paradise ARO increase (decrease)",
        "label": "Paradise ARO increase (decrease)",
        "terseLabel": "Paradise ARO increase (decrease)"
       }
      }
     },
     "localname": "ParadiseAROincreasedecrease",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Parrs1998SeriesDBondMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "PARRS 1998 Series D Bond",
        "label": "PARRS 1998 Series D Bond [Member]",
        "terseLabel": "PARRS 1998 Series D Bond"
       }
      }
     },
     "localname": "Parrs1998SeriesDBondMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Parrs1999SeriesABondMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "PARRS 1999 Series A Bond",
        "label": "PARRS 1999 Series 'A' Bond [Member]",
        "terseLabel": "PARRS 1999 Series A Bond"
       }
      }
     },
     "localname": "Parrs1999SeriesABondMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_ParrsInterestRateAfterRateReset": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The PARRS interest rate after rate reset.",
        "label": "PARRS interest rate after rate reset",
        "terseLabel": "PARRS interest rate after rate reset"
       }
      }
     },
     "localname": "ParrsInterestRateAfterRateReset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_ParrsInterestRatePriorToRateReset": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The PARRS interest rate prior to rate reset.",
        "label": "PARRS interest rate prior to rate reset",
        "terseLabel": "PARRS interest rate prior to rate reset"
       }
      }
     },
     "localname": "ParrsInterestRatePriorToRateReset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_PayablesForCollateralOnLoanedSecurities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payables for collateral on loaned securities in connection with retirement system participation in securities lending program.",
        "label": "Payables for collateral on loaned securities",
        "terseLabel": "Payables for collateral on loaned securities"
       }
      }
     },
     "localname": "PayablesForCollateralOnLoanedSecurities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PaymentOfWorkersCompensationClaims": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payment of Workers Compensation Claims",
        "label": "Payment of Workers Compensation Claims",
        "terseLabel": "Payment of Workers Compensation Claims"
       }
      }
     },
     "localname": "PaymentOfWorkersCompensationClaims",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PaymentsToUSTreasury": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payments to U.S. Treasury in repayment of, and as return on, the government's appropriation investment.",
        "label": "Payments to U S Treasury",
        "negatedLabel": "Payments to U.S. Treasury"
       }
      }
     },
     "localname": "PaymentsToUSTreasury",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PaymentsattributabletoBLEUfuelprogram": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Payments attributable to blended low-enriched uranium fuel program",
        "label": "Payments attributable to BLEU fuel program",
        "terseLabel": "Payments attributable to blended low-enriched uranium fuel currently in use"
       }
      }
     },
     "localname": "PaymentsattributabletoBLEUfuelprogram",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PaymentstoAcquirePropertyPlantandEquipmentandPaymentsforProceedsfromNuclearFuel": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Also, The net cash inflow or outflow from any material that is commonly used in the generation of nuclear energy.",
        "label": "Payments to Acquire Property, Plant, and Equipment and Payments for (Proceeds from) Nuclear Fuel",
        "terseLabel": "Construction in progress and Nuclear fuel expenditures"
       }
      }
     },
     "localname": "PaymentstoAcquirePropertyPlantandEquipmentandPaymentsforProceedsfromNuclearFuel",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PensionBenefitExpectedRateOfReturnOnPlanAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The expected rate of return on plan assets that are invested to provide for the pension benefits included in the net perodic benefit cost.",
        "label": "Pension Benefit Expected Rate of Return on Plan Assets [Member]",
        "terseLabel": "Rate of return on plan assets"
       }
      }
     },
     "localname": "PensionBenefitExpectedRateOfReturnOnPlanAssetsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PensionBenefitPlanEffectOfChangeInRateOnNetPeriodicBenefitCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of effect of change in rate on the net periodic benefit cost for pension benefits.",
        "label": "Pension Benefit Plan, Effect of Change in Rate on Net Periodic Benefit Cost",
        "terseLabel": "Impact on Pension Cost"
       }
      }
     },
     "localname": "PensionBenefitPlanEffectOfChangeInRateOnNetPeriodicBenefitCost",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PensionBenefitPlanEffectOfChangeInRateOnProjectedBenefitObligation": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of effect of change in rate on the projected benefit obligation for pension benefits.",
        "label": "Pension Benefit Plan, Effect of Change in Rate on Projected Benefit Obligation",
        "terseLabel": "Impact on Projected Benefit Obligation"
       }
      }
     },
     "localname": "PensionBenefitPlanEffectOfChangeInRateOnProjectedBenefitObligation",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PensionBenefitRatesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by rates used in measuring the pension net periodic benefit cost and projected benefit obligation.",
        "label": "Pension Benefit Rates [Axis]",
        "terseLabel": "Pension Benefit Rates"
       }
      }
     },
     "localname": "PensionBenefitRatesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_PensionBenefitRatesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The types of rates used in measuring the pension net periodic benefit cost and projected benefit obligation.",
        "label": "Pension Benefit Rates [Domain]",
        "terseLabel": "Pension Benefit Rates"
       }
      }
     },
     "localname": "PensionBenefitRatesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PensionPlanAssetAllocationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Pension Plan Asset Allocations [Abstract]",
        "label": "Pension Plan Asset Allocations [Abstract]",
        "terseLabel": "Pension Plan Asset Allocations [Abstract]"
       }
      }
     },
     "localname": "PensionPlanAssetAllocationsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_PensionPlanDiscountRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The interest rate used to adjust for the time value of money for the pension plan net periodic benefit cost and projected benefit obligation.",
        "label": "Pension Plan, Discount Rate [Member]",
        "terseLabel": "Discount rate"
       }
      }
     },
     "localname": "PensionPlanDiscountRateMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PensionandOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing pension and other postretirement defined benefit plans, liabilities, noncurrent [Member]",
        "label": "Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent [Member]",
        "terseLabel": "Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent"
       }
      }
     },
     "localname": "PensionandOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrentMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PercentOfParValue": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The percent of par value that debt was issued/redeemed for.",
        "label": "Percent of par value",
        "terseLabel": "Percent of par value"
       }
      }
     },
     "localname": "PercentOfParValue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_PercentOfSalesOfElectricityToLPCs": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percent of sales of electricity to LPCs",
        "label": "Percent of sales of electricity to LPCs",
        "terseLabel": "Percent of sales of electricity to LPCs"
       }
      }
     },
     "localname": "PercentOfSalesOfElectricityToLPCs",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_PercentageOfTotalOperatingRevenues": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of total operating revenues",
        "label": "Percentage of total operating revenues",
        "terseLabel": "Percentage of total operating revenues"
       }
      }
     },
     "localname": "PercentageOfTotalOperatingRevenues",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_PeriodDuringWhichActualCompanyCompensationExperienceStudyPerformed": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The period in which an actual compensation experience study is performed at TVA to determine assumptions related to compensation increases for defined benefit plans.",
        "label": "Period During Which Actual Company Compensation Experience Study Performed",
        "terseLabel": "Period during which actual company compensation experience study performed"
       }
      }
     },
     "localname": "PeriodDuringWhichActualCompanyCompensationExperienceStudyPerformed",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "tve_Periodcollectedinrates": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The time period that the expense is collected in rates.",
        "label": "Period collected in rates",
        "terseLabel": "Period collected in rates"
       }
      }
     },
     "localname": "Periodcollectedinrates",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Periodoftimeforcustomerstofulfillpaymentarrangements": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period of time for customers to fulfill payment arrangements",
        "label": "Period of time for customers to fulfill payment arrangements",
        "terseLabel": "Period of time for customers to fulfill payment arrangements"
       }
      }
     },
     "localname": "Periodoftimeforcustomerstofulfillpaymentarrangements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Periodoftimewheretheinvestorcontributescapitaltoaninvestmentinaprivatepartnershipmaximum": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period of time where the investor contributes capital to an investment in a private partnership - maximum",
        "label": "Period of time where the investor contributes capital to an investment in a private partnership - maximum",
        "terseLabel": "Period of time where the investor contributes capital to an investment in a private partnership - maximum"
       }
      }
     },
     "localname": "Periodoftimewheretheinvestorcontributescapitaltoaninvestmentinaprivatepartnershipmaximum",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_Periodoftimewheretheinvestorcontributescapitaltoaninvestmentinaprivatepartnershipminimum": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period of time where the investor contributes capital to an investment in a private partnership - minimum",
        "label": "Period of time where the investor contributes capital to an investment in a private partnership - minimum",
        "terseLabel": "Period of time where the investor contributes capital to an investment in a private partnership - minimum"
       }
      }
     },
     "localname": "Periodoftimewheretheinvestorcontributescapitaltoaninvestmentinaprivatepartnershipminimum",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_PlaintiffcivilpenaltiesrelatedtoGallatin": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount per day the plaintiffs in the Gallatin Fossil Plant CCR cases are seeking for violations related to the TN Water Quality Control Act and TN Solid Waste Disposal Act.",
        "label": "Plaintiff civil penalties related to Gallatin",
        "terseLabel": "Plaintiff civil penalties related to Gallatin"
       }
      }
     },
     "localname": "PlaintiffcivilpenaltiesrelatedtoGallatin",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PlantClosuresTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant Closures",
        "label": "Plant Closures [Text Block]",
        "terseLabel": "Plant Closures"
       }
      }
     },
     "localname": "PlantClosuresTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_PopulationOfServiceArea": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The population of the company's service area.",
        "label": "Population of service area",
        "terseLabel": "Population of service area"
       }
      }
     },
     "localname": "PopulationOfServiceArea",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_PopulationOfServiceAreaLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Population of Service Area [Line Items]",
        "label": "Population of Service Area [Line Items]",
        "terseLabel": "Population of Service Area [Line Items]"
       }
      }
     },
     "localname": "PopulationOfServiceAreaLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_PortfolioValueAtRiskLimitForForeignCurrencyTransactions": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portfolio value at risk limit for foreign currency transactions.",
        "label": "Portfolio value at risk limit for foreign currency transactions",
        "terseLabel": "Portfolio value at risk limit for foreign currency transactions"
       }
      }
     },
     "localname": "PortfolioValueAtRiskLimitForForeignCurrencyTransactions",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The possible additional future costs for compliance with Clean Air Act requirements.",
        "label": "Possible additional future costs for compliance with Clean Air Act requirements",
        "terseLabel": "Possible additional future costs for compliance with Clean Air Act requirements"
       }
      }
     },
     "localname": "PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PossibleadditionalfuturecostsforcompliancewithCCRrequirements": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The possible additional future costs for compliance with CCR requirements",
        "label": "Possible additional future costs for compliance with CCR requirements",
        "terseLabel": "Possible additional future costs for compliance with CCR requirements"
       }
      }
     },
     "localname": "PossibleadditionalfuturecostsforcompliancewithCCRrequirements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PossibleadditionalfuturecostsforcompliancewithCleanWaterrequirements.": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The possible additional future costs for compliance with Clean Water requirements.",
        "label": "Possible additional future costs for compliance with Clean Water requirements.",
        "terseLabel": "Possible additional future costs for compliance with Clean Water requirements."
       }
      }
     },
     "localname": "PossibleadditionalfuturecostsforcompliancewithCleanWaterrequirements.",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PostEmploymentBenefitsAssumptionsUsedCalculatingNetPeriodicBenefitCostAndUnpaidBenefitObligationDiscountRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The interest rate used to adjust for the time value of money.",
        "label": "Post employment Benefits, Assumptions Used Calculating Net Periodic Benefit Cost and Unpaid Benefit Obligation, Discount Rate",
        "terseLabel": "Discount rate"
       }
      }
     },
     "localname": "PostEmploymentBenefitsAssumptionsUsedCalculatingNetPeriodicBenefitCostAndUnpaidBenefitObligationDiscountRate",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_PostMedicareEligibleMemberMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Post-Medicare Eligible [Member] [Member]",
        "label": "Post-Medicare Eligible [Member] [Member]",
        "terseLabel": "Post-Medicare Eligible [Member] [Member]"
       }
      }
     },
     "localname": "PostMedicareEligibleMemberMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PostretirementBenefitCostsDeferredAsRegulatoryAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Postretirement Benefit Costs Deferred as Regulatory Assets [Abstract]",
        "label": "Postretirement Benefit Costs Deferred as Regulatory Assets [Abstract]",
        "terseLabel": "Postretirement Benefit Costs Deferred as Regulatory Assets [Abstract]"
       }
      }
     },
     "localname": "PostretirementBenefitCostsDeferredAsRegulatoryAssetsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_PowerProgramAppropriationInvestmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Power Program Appropriation Investment",
        "label": "Power Program Appropriation Investment [Member]",
        "terseLabel": "Power Program Appropriation Investment"
       }
      }
     },
     "localname": "PowerProgramAppropriationInvestmentMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PowerProgramRetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Power Program Retained Earnings",
        "label": "Power Program Retained Earnings [Member]",
        "terseLabel": "Power Program Retained Earnings"
       }
      }
     },
     "localname": "PowerProgramRetainedEarningsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PowerPurchasedUnderAgreement": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The expense for power purchased under contractual power purchase obligations.",
        "label": "Power purchased under agreement",
        "terseLabel": "Power purchased under agreement"
       }
      }
     },
     "localname": "PowerPurchasedUnderAgreement",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PreMedicareEligibleMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Pre-Medicare Eligible [Member]",
        "label": "Pre-Medicare Eligible [Member]",
        "terseLabel": "Pre-Medicare Eligible [Member]"
       }
      }
     },
     "localname": "PreMedicareEligibleMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PreferredsecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ownership interest or right to acquire or dispose of ownership interest in corporations and other legal entities for which ownership interest is represented by shares of preferred stock.",
        "label": "Preferred securities [Member]",
        "terseLabel": "Preferred securities"
       }
      }
     },
     "localname": "PreferredsecuritiesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PrepaymentObligations": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Prepayment Obligations",
        "label": "Prepayment Obligations",
        "terseLabel": "Prepayment Obligations"
       }
      }
     },
     "localname": "PrepaymentObligations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PrepaymentPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Prepayment period",
        "label": "Prepayment period",
        "terseLabel": "MLGW prepayment period"
       }
      }
     },
     "localname": "PrepaymentPeriod",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_PresentValueOfFutureMinimumLeasePaymentsOperating": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of future minimum lease payments, operating",
        "label": "Present value of future minimum lease payments, operating",
        "terseLabel": "Present value of future minimum lease payments, operating"
       }
      }
     },
     "localname": "PresentValueOfFutureMinimumLeasePaymentsOperating",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PricePerTon": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The price per ton used for the determination of fair value.",
        "label": "Price per ton",
        "terseLabel": "Price per ton"
       }
      }
     },
     "localname": "PricePerTon",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PrivateCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Private Credit [Member]",
        "label": "Private Credit [Member]",
        "terseLabel": "Private Credit [Member]"
       }
      }
     },
     "localname": "PrivateCreditMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PrivateEquityReclassedToPrivateRealAsset": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Private equity reclassed to private real asset",
        "label": "Private equity reclassed to private real asset",
        "terseLabel": "Private equity reclassed to private real asset"
       }
      }
     },
     "localname": "PrivateEquityReclassedToPrivateRealAsset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PrivateRealAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Private real estate, timber, infrastructure, farmland, and natural resources.",
        "label": "Private real assets [Member]",
        "terseLabel": "Private real assets"
       }
      }
     },
     "localname": "PrivateRealAssetsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PrivateRealEstateFundsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments held in private real estate funds.",
        "label": "Private real estate funds [Member]",
        "terseLabel": "Private real estate funds"
       }
      }
     },
     "localname": "PrivateRealEstateFundsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PrivateRealEstateReclassedToPrivateRealAsset": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Private real estate reclassed to private real asset",
        "label": "Private real estate reclassed to private real asset",
        "terseLabel": "Private real estate reclassed to private real asset"
       }
      }
     },
     "localname": "PrivateRealEstateReclassedToPrivateRealAsset",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Privatecreditmeasuredatnetassetvalue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 9.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Private credit measured at net asset value",
        "label": "Private credit measured at net asset value",
        "terseLabel": "Private credit measured at net asset value"
       }
      }
     },
     "localname": "Privatecreditmeasuredatnetassetvalue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Privatepartnershipsmeasuredatnetassetvalue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value measurements of private partnerships measured at net asset value. Private partnership investments may include holdings of investments in private real estate, venture capital, buyout, mezzanine or subordinated debt, restructuring or distressed debt, and special situations through funds management by third-party managers.",
        "label": "Private partnerships measured at net asset value",
        "terseLabel": "Private equity funds measured at net asset value"
       }
      }
     },
     "localname": "Privatepartnershipsmeasuredatnetassetvalue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Privaterealestatemeasuredatnetassetvalue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 8.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value measurements of private real estate funds measured at net asset value",
        "label": "Private real estate measured at net asset value",
        "terseLabel": "Private real estate measured at net asset value"
       }
      }
     },
     "localname": "Privaterealestatemeasuredatnetassetvalue",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ProceedsDueatClosing": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Proceeds Due at Closing",
        "label": "Proceeds Due at Closing",
        "terseLabel": "Proceeds Due at Closing"
       }
      }
     },
     "localname": "ProceedsDueatClosing",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ProceedsIn2003": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Proceeds received from entering into a leaseback transaction for qualified technological equipment and software in 2003.",
        "label": "Proceeds in 2003",
        "terseLabel": "Proceeds in 2003 for QTEs"
       }
      }
     },
     "localname": "ProceedsIn2003",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ProceedsPriorTo2004": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Proceeds received prior to 2004 by entering into leaseback transactions for 24 new peaking combustion turbine units.",
        "label": "Proceeds prior to 2004",
        "terseLabel": "Proceeds prior to 2004 for CTs"
       }
      }
     },
     "localname": "ProceedsPriorTo2004",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]",
        "label": "Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]",
        "terseLabel": "Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]"
       }
      }
     },
     "localname": "ProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_ProprietaryCapital": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "tve_LiabilitiesAndProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total proprietary capital.",
        "label": "Proprietary Capital",
        "totalLabel": "Total proprietary capital",
        "verboseLabel": "Net proprietary capital at September 30"
       }
      }
     },
     "localname": "ProprietaryCapital",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ProprietaryCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Proprietary capital [Abstract]",
        "verboseLabel": "Proprietary capital"
       }
      }
     },
     "localname": "ProprietaryCapitalAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_PublicRealAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Public real assets that include treasury inflation protected securities, commodities, and master limited partnerships.",
        "label": "Public real assets [Member]",
        "terseLabel": "Public real assets"
       }
      }
     },
     "localname": "PublicRealAssetsMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PurchaseAgreementsRequiredByFederalLawMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Purchase agreements required by federal law.",
        "label": "Purchase Agreements Required by Federal Law [Member]",
        "terseLabel": "Purchase Agreements Required by Federal Law"
       }
      }
     },
     "localname": "PurchaseAgreementsRequiredByFederalLawMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_PurchasedPowerLeaseBESS": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Purchased Power Lease - BESS",
        "label": "Purchased Power Lease - BESS",
        "terseLabel": "Purchased Power Lease"
       }
      }
     },
     "localname": "PurchasedPowerLeaseBESS",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_PutAndCallOptionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Put and Call Options",
        "label": "Put and Call Options [Abstract]",
        "terseLabel": "Put and Call Options [Abstract]"
       }
      }
     },
     "localname": "PutAndCallOptionsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_PutableAutomaticRateResetSecuritiesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Putable Automatic Rate Reset Securities [Table]",
        "label": "Putable Automatic Rate Reset Securities [Table]",
        "terseLabel": "Put and Call Options"
       }
      }
     },
     "localname": "PutableAutomaticRateResetSecuritiesTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ReacquiredRights": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reacquired Rights",
        "label": "Reacquired Rights",
        "terseLabel": "Reacquired Rights"
       }
      }
     },
     "localname": "ReacquiredRights",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Reacquisitionpriceofleaseleasebackobligations": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reacquisition price of lease/leaseback obligations",
        "label": "Reacquisition price of lease/leaseback obligations",
        "terseLabel": "Reacquisition price"
       }
      }
     },
     "localname": "Reacquisitionpriceofleaseleasebackobligations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReclassEnvironmentalAgreementsToOtherRegAssets": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclass Environmental agreements to Other reg assets",
        "label": "Reclass Environmental agreements to Other reg assets",
        "terseLabel": "Reclass Environmental agreements to Other reg assets"
       }
      }
     },
     "localname": "ReclassEnvironmentalAgreementsToOtherRegAssets",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReclassFromAPToAROs": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclass from AP to AROs",
        "label": "Reclass from AP to AROs",
        "terseLabel": "Reclass from AP to AROs"
       }
      }
     },
     "localname": "ReclassFromAPToAROs",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReclassificationofGallatinprojects": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclassification of Gallatin projects",
        "label": "Reclassification of Gallatin projects",
        "negatedTerseLabel": "Reclassification of Gallatin projects"
       }
      }
     },
     "localname": "ReclassificationofGallatinprojects",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Reclassificationofrestrictedcash": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclassification of restricted cash",
        "label": "Reclassification of restricted cash",
        "terseLabel": "Restricted Cash"
       }
      }
     },
     "localname": "Reclassificationofrestrictedcash",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReclassificationsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclassifications [Line Items]",
        "label": "Reclassifications [Line Items]",
        "terseLabel": "Reclassifications"
       }
      }
     },
     "localname": "ReclassificationsLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ReclassificationsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclassifications [Table]",
        "label": "Reclassifications [Table]",
        "terseLabel": "Reclassifications"
       }
      }
     },
     "localname": "ReclassificationsTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ReclassofOthernet": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclass of Other, net",
        "label": "Reclass of Other, net",
        "terseLabel": "Reclass of Other, net"
       }
      }
     },
     "localname": "ReclassofOthernet",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReconciliationOfAssetRetirementObligationLiabilityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reconciliation of Asset Retirement Obligation Liability [Axis]",
        "label": "Reconciliation of Asset Retirement Obligation Liability [Axis]",
        "terseLabel": "Asset Retirement Obligations",
        "verboseLabel": "Reconciliation of Asset Retirement Obligation Liability [Axis]"
       }
      }
     },
     "localname": "ReconciliationOfAssetRetirementObligationLiabilityAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ReconciliationOfAssetRetirementObligationLiabilityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reconciliation of Asset Retirement Obligation Liability [Domain]",
        "label": "Reconciliation of Asset Retirement Obligation Liability [Domain]",
        "terseLabel": "Asset Retirement Obligations",
        "verboseLabel": "Reconciliation of Asset Retirement Obligation Liability [Domain]"
       }
      }
     },
     "localname": "ReconciliationOfAssetRetirementObligationLiabilityDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_RecordedCostForEmissionAllowancesGrantedByEnvironmentalProtectionAgency": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Recorded cost for emission allowances granted by the Environmental Protection Agency",
        "label": "Recorded cost for emission allowances granted by the Environmental Protection Agency",
        "terseLabel": "Recorded cost for emission allowances granted by the Environmental Protection Agency"
       }
      }
     },
     "localname": "RecordedCostForEmissionAllowancesGrantedByEnvironmentalProtectionAgency",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RedemptionofDebtAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Redemption of Debt [Abstract]",
        "label": "Redemption of Debt [Abstract]",
        "terseLabel": "Redemption of Debt [Abstract]"
       }
      }
     },
     "localname": "RedemptionofDebtAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_RedemptionsAndMaturitiesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Redemptions and Maturities [Axis]",
        "label": "Redemptions and Maturities [Axis]",
        "terseLabel": "Redemptions/Maturities"
       }
      }
     },
     "localname": "RedemptionsAndMaturitiesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_RegulatoryAndOtherLongTermAssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Regulatory And Other Long Term Assets [Abstract]",
        "verboseLabel": "Regulatory and other long-term assets"
       }
      }
     },
     "localname": "RegulatoryAndOtherLongTermAssetsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_RegulatoryAssetAccountingTreatmentTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Regulatory Asset Accounting Treatment [Table]",
        "label": "Regulatory Asset Accounting Treatment [Table Text Block]",
        "terseLabel": "Regulatory Asset Accounting Treatment [Table Text Block]"
       }
      }
     },
     "localname": "RegulatoryAssetAccountingTreatmentTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesRegulatoryAssetTreatmentPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_RegulatoryAssetsAndLiabilitiesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory Assets and Liabilities [Axis]",
        "label": "Regulatory Assets and Liabilities [Axis]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "RegulatoryAssetsAndLiabilitiesAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_RegulatoryAssetsAndLiabilitiesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory Assets and Liabilities [Domain]",
        "label": "Regulatory Assets and Liabilities [Domain]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "RegulatoryAssetsAndLiabilitiesDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_RegulatoryAssetsAndLiabilitiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory Assets and Liabilities [Line Items]",
        "label": "Regulatory Assets and Liabilities [Line Items]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "RegulatoryAssetsAndLiabilitiesLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_RegulatoryAssetsAndLiabilitiesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory Assets and Liabilities [Table]",
        "label": "Regulatory Assets and Liabilities [Table]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "RegulatoryAssetsAndLiabilitiesTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_Regulatoryassetscosts": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash amount spent on regulatory assets.",
        "label": "Regulatory assets costs",
        "negatedTerseLabel": "Regulatory asset costs"
       }
      }
     },
     "localname": "Regulatoryassetscosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Regulatorycurrentassetamortizationperiod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amortization period for recovery of the individual regulatory current asset in a schedule of regulatory assets.",
        "label": "RegulatoryCurrentAssetAmortizationPeriod",
        "terseLabel": "Current regulatory asset amortization period"
       }
      }
     },
     "localname": "Regulatorycurrentassetamortizationperiod",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_ReimbursementsfromDOE": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reimbursements from DOE",
        "label": "Reimbursements from DOE",
        "terseLabel": "Reimbursements from DOE"
       }
      }
     },
     "localname": "ReimbursementsfromDOE",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RemainingAppropriationInvestment": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The remaining appropriation investment if no additional appropriations from Congress are received.",
        "label": "Remaining appropriation investment",
        "terseLabel": "Remaining appropriation investment"
       }
      }
     },
     "localname": "RemainingAppropriationInvestment",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Remainingtermsoftheagreementshighendofrange": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The high end of the range of remaining terms of the agreements.",
        "label": "Remaining terms of the agreements, high end of range",
        "terseLabel": "Remaining terms of the agreements, high end of range"
       }
      }
     },
     "localname": "Remainingtermsoftheagreementshighendofrange",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "tve_ReserveMWToPurchaseFromTheMarket": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reserve MW to purchase from the market",
        "label": "Reserve MW to purchase from the market",
        "terseLabel": "Reserve MW to purchase from the market"
       }
      }
     },
     "localname": "ReserveMWToPurchaseFromTheMarket",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "perUnitItemType"
    },
    "tve_RetainedEarningsPowerProgram": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "tve_TotalPowerProgramProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit from power program activities less amounts returned to the U.S. government as a return on its appropriation investment in the power program.",
        "label": "Retained Earnings Power Program",
        "verboseLabel": "Power program retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsPowerProgram",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RetirementAgeOfEligibilityForCostOfLivingAdjustmentAfterJanuary12010": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Retirement age of eligibility for cost of living adjustment after January 1, 2010.",
        "label": "Retirement age of eligibility for cost of living adjustment after January 1, 2010",
        "terseLabel": "Retirement age of eligibility for cost of living adjustment after January 1, 2010"
       }
      }
     },
     "localname": "RetirementAgeOfEligibilityForCostOfLivingAdjustmentAfterJanuary12010",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_RetirementageofeligibilityforcostoflivingadjustmentbeforeJanuary12010": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Retirement age of eligibility for cost of living adjustment before January 1, 2010.",
        "label": "Retirement age of eligibility for cost of living adjustment before January 1, 2010",
        "terseLabel": "Retirement age of eligibility for cost of living adjustment before January 1, 2010"
       }
      }
     },
     "localname": "RetirementageofeligibilityforcostoflivingadjustmentbeforeJanuary12010",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_RetrospectivePremiums": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum amount of retrospective premiums that could be required for accidental outage insurance.",
        "label": "Retrospective premiums",
        "terseLabel": "Maximum amount of retrospective premiums"
       }
      }
     },
     "localname": "RetrospectivePremiums",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ReturnOnAppropriationInvestment": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents disclosure of the cash payments from net power proceeds paid annually to the U.S. government as a return on the government's appropriation investment in the reporting entity.",
        "label": "Return on Appropriation Investment",
        "negatedTerseLabel": "Return on power program appropriation investment"
       }
      }
     },
     "localname": "ReturnOnAppropriationInvestment",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevenueCapitalizedDuringPreCommercialOperations": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount",
        "label": "Revenue Capitalized During Pre-Commercial Operations",
        "negatedTerseLabel": "Revenue Capitalized During Pre-Commercial Operations",
        "terseLabel": "Revenue Capitalized During Pre-Commercial Operations"
       }
      }
     },
     "localname": "RevenueCapitalizedDuringPreCommercialOperations",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevisionsToAssetRetirementCosts": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Revisions to asset retirement costs",
        "label": "Revisions to asset retirement costs",
        "terseLabel": "Revisions to asset retirement costs"
       }
      }
     },
     "localname": "RevisionsToAssetRetirementCosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevolvingCreditFacility1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the first revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Revolving Credit Facility 1",
        "terseLabel": "Revolving credit facility 1"
       }
      }
     },
     "localname": "RevolvingCreditFacility1",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevolvingCreditFacility2": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the second revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Revolving Credit Facility 2",
        "terseLabel": "Revolving Credit Facility 2"
       }
      }
     },
     "localname": "RevolvingCreditFacility2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevolvingCreditFacility3": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the third revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Revolving Credit Facility 3",
        "terseLabel": "Revolving credit facility 3"
       }
      }
     },
     "localname": "RevolvingCreditFacility3",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_RevolvingCreditFacility4": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the fourth revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Revolving Credit Facility 4",
        "terseLabel": "Revolving Credit Facility 4"
       }
      }
     },
     "localname": "RevolvingCreditFacility4",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_SCCGMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Southaven Combined Cycle Generation, LLC",
        "label": "SCCG [Member]",
        "terseLabel": "SCCG"
       }
      }
     },
     "localname": "SCCGMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_SafetyorientedfixedincomeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Safety oriented fixed income [Member]",
        "label": "Safety oriented fixed income [Member]",
        "terseLabel": "Safety oriented fixed income"
       }
      }
     },
     "localname": "SafetyorientedfixedincomeMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Salesdiscountservices": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Revenue reduction for energy prepayment",
        "label": "Sales discount, services",
        "terseLabel": "Discounts reducing electricity sales"
       }
      }
     },
     "localname": "Salesdiscountservices",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_SalesofElectricitysubtotal": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sales of Electricity",
        "label": "Sales of Electricity (subtotal)",
        "terseLabel": "Sales of Electricity (subtotal)"
       }
      }
     },
     "localname": "SalesofElectricitysubtotal",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ScheduleOfAssumptionsUsedAndHealthcareCostTrendRatesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, expected long-term rates of return on plan assets, assumed health care cost trend rates for the next year, ultimate health care trend rate(s), and when the ultimate healthcare trend rate is expected to be achieved.",
        "label": "Schedule of Assumptions Used and Healthcare Cost Trend Rates [Table Text Block]",
        "terseLabel": "Actuarial Assumptions"
       }
      }
     },
     "localname": "ScheduleOfAssumptionsUsedAndHealthcareCostTrendRatesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfDefinedBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the defined pension and other post-retirement benefit costs deferred as regulatory assets including unrecognized prior service costs and unrecognized net gain/loss on plan assets",
        "label": "Schedule of Defined Benefit Costs Deferred as Regulatory Assets [Table Text Block]",
        "terseLabel": "Post-Retirement Benefit Costs Deferred as Regulatory Assets"
       }
      }
     },
     "localname": "ScheduleOfDefinedBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfDerivativesUnderFinancialTradingProgramTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of pertinent information about derivatives under the Financial Trading Program. Includes a combination of the type of instrument, notional amount, related hedged item, and fair value.",
        "label": "Schedule of Derivatives Under Financial Trading Program [Table Text Block]",
        "terseLabel": "Derivatives Under Financial Trading Program"
       }
      }
     },
     "localname": "ScheduleOfDerivativesUnderFinancialTradingProgramTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfEffectOfOneQuarterPercentageDecreaseInPensionDiscountRateAndRateOfReturnOnPlanAssetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the effect of a one-quarter-percentage-point decrease in the pension discount rate and the rate of return on plan assets on the net periodic pension benefit costs and the projected benefit obligation for the next fiscal year that follows the most recent annual statement of financial position presented.",
        "label": "Schedule Of Effect Of One Quarter Percentage Decrease In Pension Discount Rate and Rate of Return on Plan Assets [Table Text Block]",
        "terseLabel": "Sensitivity to Certain Changes in Pension Assumptions"
       }
      }
     },
     "localname": "ScheduleOfEffectOfOneQuarterPercentageDecreaseInPensionDiscountRateAndRateOfReturnOnPlanAssetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfExpectedAmortizationOfPensionAndPostretirementBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of expected amortization amounts in the next fiscal year of pension and postretirement benefit costs deferred as regulatory assets.",
        "label": "Schedule of expected amortization of pension and postretirement benefit costs deferred as regulatory assets [Table Text Block]",
        "terseLabel": "Expected Amortization of Regulatory Assets in Next Fiscal Year"
       }
      }
     },
     "localname": "ScheduleOfExpectedAmortizationOfPensionAndPostretirementBenefitCostsDeferredAsRegulatoryAssetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExessOfPlanAssetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of benefit obligations including the projected benefit obligation and the accumulated benefit obligation where the obligations exceed the fair value of the plan assets as of the measurement date.",
        "label": "Schedule of projected benefit obligations and accumulated benefit obligations in exess of plan assets [Table Text Block]",
        "terseLabel": "Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets"
       }
      }
     },
     "localname": "ScheduleOfProjectedBenefitObligationsAndAccumulatedBenefitObligationsInExessOfPlanAssetsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods",
        "label": "Schedule of Regulatory Assets and Liabilities [Table Text Block]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleoffutureminumpaymentsformembershipinterestssubjecttomandatoryredemptionTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Schedule of future minimum payments for membership interests subject to mandatory redemption [Table]",
        "label": "Schedule of future minum payments for membership interests subject to mandatory redemption [Table Text Block]",
        "terseLabel": "Schedule of future minimum payments for membership interests subject to mandatory redemption [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleoffutureminumpaymentsformembershipinterestssubjecttomandatoryredemptionTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_ScheduleofleaseleasebackfutureminimumpaymentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Schedule of lease/leaseback future minimum payments [Table]",
        "label": "Schedule of lease/leaseback future minimum payments [Table Text Block]",
        "terseLabel": "Schedule of lease/leaseback future minimum payments [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleofleaseleasebackfutureminimumpaymentsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_SecuredDebtOfViesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Secured Debt of VIEs [Abstract]",
        "label": "Secured Debt of VIEs [Abstract]",
        "terseLabel": "Secured Debt of VIEs [Abstract]"
       }
      }
     },
     "localname": "SecuredDebtOfViesAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SecuredNotesofSPEsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Secured Notes of SPEs [Abstract]",
        "label": "Secured Notes of SPEs [Abstract]",
        "terseLabel": "Secured Notes of SPEs [Abstract]"
       }
      }
     },
     "localname": "SecuredNotesofSPEsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SecurednotesofSPEsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Line Items] for Secured notes of SPEs [Table]",
        "label": "Secured notes of SPEs [Line Items]",
        "terseLabel": "Secured notes"
       }
      }
     },
     "localname": "SecurednotesofSPEsLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_SecurednotesofSPEsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Secured notes of SPEs [Table]",
        "label": "Secured notes of SPEs [Table]",
        "terseLabel": "Secured notes"
       }
      }
     },
     "localname": "SecurednotesofSPEsTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_SensitivityToCertainChangesInPensionAssumptionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sensitivity to Certain Changes in Pension Assumptions [Abstract]",
        "label": "Sensitivity to Certain Changes in Pension Assumptions [Abstract]",
        "terseLabel": "Sensitivity to Certain Changes in Pension Assumptions [Abstract]"
       }
      }
     },
     "localname": "SensitivityToCertainChangesInPensionAssumptionsAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SensitivityToChangesInAssumedHealthCareCostTrendRatesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sensitivity to Changes in Assumed Health Care Cost Trend Rates [Abstract]",
        "label": "Sensitivity to Changes in Assumed Health Care Cost Trend Rates [Abstract]",
        "terseLabel": "Sensitivity to Changes in Assumed Health Care Cost Trend Rates [Abstract]"
       }
      }
     },
     "localname": "SensitivityToChangesInAssumedHealthCareCostTrendRatesAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SerpMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Supplemental Executive Retirement Plan. TVA established a SERP for certain executives in critical positions to provide supplemental pension benefits tied to compensation that exceeds limits imposed by Internal Revenue Service (\u201cIRS\u201d) rules applicable to the qualified defined benefit pension plan. The SERP is composed of multiple types of investments and is managed by external institutional managers.",
        "label": "SERP [Member]",
        "terseLabel": "SERP"
       }
      }
     },
     "localname": "SerpMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_Serviceagreements": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Service agreements",
        "label": "Service agreements",
        "terseLabel": "Service agreements"
       }
      }
     },
     "localname": "Serviceagreements",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_SettlementofAssetRetirementObligationsThroughCashPayments": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset retirement obligations settled through cash transactions.",
        "label": "Settlement of Asset Retirement Obligations Through Cash Payments",
        "negatedTerseLabel": "Settlements of asset retirement obligations"
       }
      }
     },
     "localname": "SettlementofAssetRetirementObligationsThroughCashPayments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ShortTermDebtGrossDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short-Term Debt, Gross [Domain]",
        "label": "Short-Term Debt, Gross [Domain]",
        "terseLabel": "Short-Term Debt, Gross [Domain]"
       }
      }
     },
     "localname": "ShortTermDebtGrossDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_ShortTermDebtGrossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Line Items] for Short-Term Debt, Gross [Table]",
        "label": "Short-Term Debt, Gross [Line Items]",
        "terseLabel": "Short-Term Debt, Gross [Line Items]"
       }
      }
     },
     "localname": "ShortTermDebtGrossLineItems",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ShortTermDebtGrossTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short-Term Debt, Gross [Table]",
        "label": "Short-Term Debt, Gross [Table]",
        "terseLabel": "Short-Term Debt, Gross [Table]"
       }
      }
     },
     "localname": "ShortTermDebtGrossTable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_ShorttermBorrowingsGross": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short-term Borrowings Gross",
        "label": "Short-term Borrowings Gross",
        "terseLabel": "Short-term Borrowings Gross"
       }
      }
     },
     "localname": "ShorttermBorrowingsGross",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_SpecialpurposeentityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Special purpose entity [Member]",
        "label": "Special purpose entity [Member]",
        "terseLabel": "Special purpose entity",
        "verboseLabel": "Notes payable"
       }
      }
     },
     "localname": "SpecialpurposeentityMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_SubsequentCreditOnPublicPowerSupportAndStabilizationProgram": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subsequent Credit on Public Power Support and Stabilization Program",
        "label": "Subsequent Credit on Public Power Support and Stabilization Program",
        "terseLabel": "Subsequent Credit on Public Power Support and Stabilization Program"
       }
      }
     },
     "localname": "SubsequentCreditOnPublicPowerSupportAndStabilizationProgram",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_SummaryOfDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment [Abstract]",
        "label": "Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment [Abstract]",
        "terseLabel": "Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment [Abstract]"
       }
      }
     },
     "localname": "SummaryOfDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SummaryOfDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment [Abstract]",
        "label": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment [Abstract]",
        "terseLabel": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment [Abstract]"
       }
      }
     },
     "localname": "SummaryOfDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "xbrltype": "stringItemType"
    },
    "tve_SummaryOfProprietaryCapitalActivityTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of changes in components of proprietary capital including net income, return of investment and return on investment by program",
        "label": "Summary of Proprietary Capital Activity [Table Text Block]",
        "terseLabel": "Summary of Proprietary Capital Activity"
       }
      }
     },
     "localname": "SummaryOfProprietaryCapitalActivityTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_SurchargeForLegalExpenses": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The surcharge for legal expenses.",
        "label": "Surcharge for legal expenses",
        "terseLabel": "Surcharge for legal expenses"
       }
      }
     },
     "localname": "SurchargeForLegalExpenses",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_TDECcivilpenaltiesrelatedtoGallatin": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount per day TDEC is seeking for each day TVA is found to have violated the statutes related to the TN Water Quality Control Act and TN Solid Waste Disposal Act in relation to Gallatin Fossil Plant.",
        "label": "TDEC civil penalties related to Gallatin",
        "terseLabel": "TDEC civil penalties related to Gallatin"
       }
      }
     },
     "localname": "TDECcivilpenaltiesrelatedtoGallatin",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_ThresholdforDeferralofActuarialGainLossUnderCorridorApproach": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Threshold for Deferral of Actuarial Gain/Loss Under Corridor Approach",
        "label": "Threshold for Deferral of Actuarial Gain/Loss Under Corridor Approach",
        "terseLabel": "Threshold for Deferral of Actuarial Gain/Loss Under Corridor Approach"
       }
      }
     },
     "localname": "ThresholdforDeferralofActuarialGainLossUnderCorridorApproach",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_TotalAROChangeDueToCCR": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total ARO change due to CCR",
        "label": "Total ARO change due to CCR",
        "totalLabel": "Total ARO change due to CCR"
       }
      }
     },
     "localname": "TotalAROChangeDueToCCR",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalAmountOfProtectionAvailable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of protection available to compensate for losses arising from a nuclear event in the United States.",
        "label": "Total amount of protection available",
        "terseLabel": "Total amount of protection available"
       }
      }
     },
     "localname": "TotalAmountOfProtectionAvailable",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalFinanceLeaseCosts": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total finance lease costs",
        "label": "Total finance lease costs",
        "totalLabel": "Total finance lease costs"
       }
      }
     },
     "localname": "TotalFinanceLeaseCosts",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalFinancialPositionsAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total financial positions [Axis]",
        "label": "Total financial positions [Axis]",
        "terseLabel": "Total financial positions [Axis]"
       }
      }
     },
     "localname": "TotalFinancialPositionsAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_TotalLeaseAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total lease assets",
        "label": "Total lease assets",
        "totalLabel": "Total lease assets"
       }
      }
     },
     "localname": "TotalLeaseAssets",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalLeaseLiabilities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total lease liabilities",
        "label": "Total lease liabilities",
        "terseLabel": "Total lease liabilities"
       }
      }
     },
     "localname": "TotalLeaseLiabilities",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total [Member]",
        "label": "Total [Member]",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "TotalMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_TotalNumberOfLPCs": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of LPCs",
        "label": "Total number of LPCs",
        "terseLabel": "Total number of LPCs"
       }
      }
     },
     "localname": "TotalNumberOfLPCs",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_TotalPowerProgramProprietaryCapital": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "tve_ProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of appropriation investment and earnings retained by its power program.",
        "label": "Total power program proprietary capital",
        "totalLabel": "Total power program proprietary capital"
       }
      }
     },
     "localname": "TotalPowerProgramProprietaryCapital",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_TotalderivativessubjecttomasternettingorsimilararrangementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial asset or liability or other contract with one or more underlyings, notional amount or payment provision or both, subject to a master netting arrangement and the contract can be net settled by means outside the contract or delivery of an asset.",
        "label": "Total derivatives subject to master netting or similar arrangement [Member]",
        "terseLabel": "Total derivatives subject to master netting or similar arrangement"
       }
      }
     },
     "localname": "TotalderivativessubjecttomasternettingorsimilararrangementMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_TypeOfEnvironmentalAgreementsPaidAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of Environmental Agreements Paid [Axis]",
        "label": "Type of Environmental Agreements Paid [Axis]",
        "terseLabel": "Type of Environmental Agreements Paid"
       }
      }
     },
     "localname": "TypeOfEnvironmentalAgreementsPaidAxis",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_TypeOfEnvironmentalAgreementsPaidDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Domain] for Type of Environmental Agreements Paid [Axis]",
        "label": "Type of Environmental Agreements Paid [Domain]",
        "terseLabel": "Type of Environmental Agreements Paid"
       }
      }
     },
     "localname": "TypeOfEnvironmentalAgreementsPaidDomain",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The U.S. Congress is required to take action to provide additional funds to cover the additional losses if these layes are exhausted.",
        "label": "The U.S. Congress is required to take action if these layes are exhausted",
        "terseLabel": "Number of layers until the U.S. Congress is required to take action"
       }
      }
     },
     "localname": "USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "tve_USTreasurypaymentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "US Treasury payments [Table Text Block]",
        "label": "US Treasury payments [Table Text Block]",
        "terseLabel": "Payments to U S Treasury"
       }
      }
     },
     "localname": "USTreasurypaymentsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalPaymentstotheUSTreasuryPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_UnfundedLoanCommitments": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time.",
        "label": "Unfunded Loan Commitments",
        "terseLabel": "Unfunded Loan Commitments"
       }
      }
     },
     "localname": "UnfundedLoanCommitments",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Unfundedloancommitmentdueinnexttwelvemonths": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitment due in next twelve months",
        "label": "Unfunded loan commitment due in next twelve months",
        "terseLabel": "2018"
       }
      }
     },
     "localname": "Unfundedloancommitmentdueinnexttwelvemonths",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Unfundedloancommitmentdueinyear2": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitment due in year 2",
        "label": "Unfunded loan commitment due in year 2",
        "terseLabel": "2019"
       }
      }
     },
     "localname": "Unfundedloancommitmentdueinyear2",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Unfundedloancommitmentdueinyear3": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitment due in year 3",
        "label": "Unfunded loan commitment due in year 3",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "Unfundedloancommitmentdueinyear3",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Unfundedloancommitmentdueinyear4": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitment due in year 4",
        "label": "Unfunded loan commitment due in year 4",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "Unfundedloancommitmentdueinyear4",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Unfundedloancommitmentdueinyear5": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitment due in year 5",
        "label": "Unfunded loan commitment due in year 5",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "Unfundedloancommitmentdueinyear5",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_UnfundedloancommitmentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unfunded loan commitments [Table Text Block]",
        "label": "Unfunded loan commitments [Table Text Block]",
        "terseLabel": "Unfunded loan commitments"
       }
      }
     },
     "localname": "UnfundedloancommitmentsTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_Unpaideconomicincentives": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unpaid economic incentives",
        "label": "Unpaid economic incentives",
        "terseLabel": "Unpaid economic incentives"
       }
      }
     },
     "localname": "Unpaideconomicincentives",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RevenueEconomicDevelopmentIncentivesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_UnrealizedgainslossesonSERPDCP": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unrealized gains (losses) on SERP &amp; DCP",
        "label": "Unrealized gains (losses) on SERP &amp; DCP",
        "terseLabel": "Gains (losses) on investments"
       }
      }
     },
     "localname": "UnrealizedgainslossesonSERPDCP",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_UnrealizedlossesoninterestratederivativesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unrealized losses on interest rate derivatives [Member]",
        "label": "Unrealized losses on interest rate derivatives [Member]",
        "terseLabel": "Unrealized losses on interest rate derivatives"
       }
      }
     },
     "localname": "UnrealizedlossesoninterestratederivativesMember",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "tve_VieFinancingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "VIE Financing [Abstract]",
        "label": "VIE Financing [Abstract]",
        "terseLabel": "VIE Financing"
       }
      }
     },
     "localname": "VieFinancingAbstract",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "tve_Votingpercentagerequiredtodesolvepartnershipinprivateequity": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The voting percentage required to desolve a partnership in private equity.",
        "label": "Voting percentage required to desolve partnership in private equity",
        "terseLabel": "Voting percentage required to desolve partnership in private equity"
       }
      }
     },
     "localname": "Votingpercentagerequiredtodesolvepartnershipinprivateequity",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "tve_WeightedAveragesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted Averages",
        "label": "Weighted Averages [Table Text Block]",
        "terseLabel": "Weighted Averages"
       }
      }
     },
     "localname": "WeightedAveragesTableTextBlock",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/LeasesTableTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "tve_Writeoffsmaterialsandsupplies": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Write-offs materials and supplies",
        "label": "Write-offs materials and supplies",
        "terseLabel": "Write-offs materials and supplies"
       }
      }
     },
     "localname": "Writeoffsmaterialsandsupplies",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_Writeoffsrelatedtoretirementofplants": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Write-offs related to retirement of plants",
        "label": "Write-offs related to retirement of plants",
        "terseLabel": "Write-offs related to retirement of plants"
       }
      }
     },
     "localname": "Writeoffsrelatedtoretirementofplants",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_YearlyamortizationofDeferrednucleargeneratingunits": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The yearly expense to be charged against earnings to allocate the capitalized costs of the deferred nuclear generating units regulatory asset.",
        "label": "Yearly amortization of Deferred nuclear generating units",
        "terseLabel": "Yearly amortization of Deferred nuclear generating units"
       }
      }
     },
     "localname": "YearlyamortizationofDeferrednucleargeneratingunits",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "tve_YearsofServiceThresholdforChangestoCashBalancePlan": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Years of Service Threshold Related to 2016 Amendments to TVA Pension Plan",
        "label": "Years of Service Threshold for Changes to Cash Balance Plan",
        "terseLabel": "Years of Service Threshold for Changes to Cash Balance Plan"
       }
      }
     },
     "localname": "YearsofServiceThresholdforChangestoCashBalancePlan",
     "nsuri": "http://www.tva.gov/20200930",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "durationStringItemType"
    },
    "us-gaap_AccountingChangesAndErrorCorrectionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Changes and Error Corrections [Abstract]",
        "terseLabel": "Accounting Changes and Error Corrections [Abstract]"
       }
      }
     },
     "localname": "AccountingChangesAndErrorCorrectionsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]",
        "terseLabel": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountsNotesAndLoansReceivableLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Accounts, Notes, Loans and Financing Receivable [Line Items]",
        "terseLabel": "Accounts, Notes, Loans and Financing Receivable [Line Items]"
       }
      }
     },
     "localname": "AccountsNotesAndLoansReceivableLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of receivable.",
        "label": "Receivable Type [Axis]",
        "terseLabel": "Accounts Receivable Type"
       }
      }
     },
     "localname": "AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent": {
     "auth_ref": [
      "r54"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.",
        "label": "Accounts Payable and Accrued Liabilities, Current",
        "negatedTerseLabel": "Accounts payable and accrued liabilities",
        "verboseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent": {
     "auth_ref": [
      "r630",
      "r655"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.",
        "label": "Accounts Payable and Accrued Liabilities",
        "terseLabel": "Accounts Payable and Accrued Liabilities"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsPayableAndAccruedLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing accounts payable and accrued liabilities.",
        "label": "Accounts Payable and Accrued Liabilities [Member]",
        "terseLabel": "Accounts payable and accrued liabilities",
        "verboseLabel": "Accounts Payable and Accrued Liabilities"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsPayableMember": {
     "auth_ref": [
      "r15"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Obligations incurred and payable to vendors for goods and services received.",
        "label": "Accounts Payable [Member]",
        "terseLabel": "Accounts Payable [Member]"
       }
      }
     },
     "localname": "AccountsPayableMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsReceivableGrossCurrent": {
     "auth_ref": [
      "r217",
      "r218"
     ],
     "calculation": {
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AccountsReceivableNetCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
        "label": "Accounts Receivable, before Allowance for Credit Loss, Current",
        "terseLabel": "Power receivables",
        "verboseLabel": "Receivables from power sales"
       }
      }
     },
     "localname": "AccountsReceivableGrossCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsReceivableMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Due from customers or clients for goods or services that have been delivered or sold.",
        "label": "Accounts Receivable [Member]",
        "terseLabel": "Accounts Receivable [Member]"
       }
      }
     },
     "localname": "AccountsReceivableMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsReceivableNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounts Receivable, after Allowance for Credit Loss [Abstract]",
        "terseLabel": "Accounts Receivable, after Allowance for Credit Loss [Abstract]"
       }
      }
     },
     "localname": "AccountsReceivableNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountsReceivableNetCurrent": {
     "auth_ref": [
      "r5",
      "r34",
      "r217",
      "r218"
     ],
     "calculation": {
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
        "label": "Accounts Receivable, after Allowance for Credit Loss, Current",
        "totalLabel": "Accounts receivable, net",
        "verboseLabel": "Accounts receivable, net"
       }
      }
     },
     "localname": "AccountsReceivableNetCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccrualForEnvironmentalLossContingenciesGross": {
     "auth_ref": [
      "r269",
      "r282"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Undiscounted amount of the accrual for environmental loss contingencies.",
        "label": "Accrual for Environmental Loss Contingencies, Gross",
        "terseLabel": "Accrual for Environmental Loss Contingencies, Gross",
        "verboseLabel": "Estimated liability for cleanup and similar environmental work on a non-discounted basis"
       }
      }
     },
     "localname": "AccrualForEnvironmentalLossContingenciesGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent": {
     "auth_ref": [
      "r62",
      "r268",
      "r269",
      "r273"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.",
        "label": "Accrued Environmental Loss Contingencies, Noncurrent",
        "terseLabel": "Gallatin coal combustion residual facilities"
       }
      }
     },
     "localname": "AccruedEnvironmentalLossContingenciesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": {
     "auth_ref": [
      "r47",
      "r255"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "tve_NetCompletedPlant",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.",
        "label": "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment",
        "negatedLabel": "Less accumulated depreciation",
        "terseLabel": "Accumulated depreciation"
       }
      }
     },
     "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Accumulated Other Comprehensive Income (Loss) [Line Items]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r35",
      "r87",
      "r88",
      "r89",
      "r651",
      "r674",
      "r678"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "tve_ProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax",
        "terseLabel": "Accumulated other comprehensive income (loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r86",
      "r89",
      "r92",
      "r153",
      "r154",
      "r155",
      "r460",
      "r669",
      "r670"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.",
        "label": "AOCI Attributable to Parent [Member]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) Net Gains (Losses) on Cash Flow Hedges"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalCollateralAggregateFairValue": {
     "auth_ref": [
      "r499"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.",
        "label": "Additional Collateral, Aggregate Fair Value",
        "terseLabel": "Likely collateral obligation increase if downgraded"
       }
      }
     },
     "localname": "AdditionalCollateralAggregateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Adjustments to reconcile net income (loss) to net cash provided by operating activities"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivable": {
     "auth_ref": [
      "r223",
      "r240",
      "r241",
      "r242"
     ],
     "calculation": {
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_AccountsReceivableNetCurrent",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on accounts receivable.",
        "label": "Accounts Receivable, Allowance for Credit Loss",
        "negatedTerseLabel": "Allowance for uncollectible accounts"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": {
     "auth_ref": [
      "r36",
      "r223",
      "r240"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on accounts receivable, classified as current.",
        "label": "Accounts Receivable, Allowance for Credit Loss, Current",
        "terseLabel": "Allowance for uncollectible accounts - receivables",
        "verboseLabel": "Accounts Receivable, Allowance for Credit Loss, Current"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent": {
     "auth_ref": [
      "r37",
      "r223",
      "r240"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on financing receivable, classified as noncurrent.",
        "label": "Financing Receivable, Allowance for Credit Loss, Noncurrent",
        "terseLabel": "Allowance for uncollectible accounts - loans"
       }
      }
     },
     "localname": "AllowanceForNotesAndLoansReceivableNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationAndDepreciationOfDecontaminatingAndDecommissioningAssets": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The current period expense charged against earnings on decontaminating and decommissioning of facilities used in the normal conduct of business and not intended for resale to allocate or recognize the cost of the assets over their useful lives.",
        "label": "Amortization and Depreciation of Decontaminating and Decommissioning Assets",
        "terseLabel": "Amortization and Depreciation of Decontaminating and Decommissioning Assets"
       }
      }
     },
     "localname": "AmortizationAndDepreciationOfDecontaminatingAndDecommissioningAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfNuclearFuelLease": {
     "auth_ref": [
      "r130",
      "r556",
      "r726"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The expense charged against earnings for the periodic recognition of capitalized nuclear fuel leases.",
        "label": "Amortization of Nuclear Fuel Lease",
        "terseLabel": "Amortization of nuclear fuel cost"
       }
      }
     },
     "localname": "AmortizationOfNuclearFuelLease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AmortizationOfRegulatoryAsset": {
     "auth_ref": [
      "r107",
      "r130"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The expense charged against earnings during the period to allocate the capitalized costs of regulatory assets over the periods expected to benefit from such costs.",
        "label": "Amortization of Regulatory Asset",
        "negatedTerseLabel": "Regulatory asset amount expensed",
        "terseLabel": "Regulatory asset amount expensed"
       }
      }
     },
     "localname": "AmortizationOfRegulatoryAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligation": {
     "auth_ref": [
      "r262"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.",
        "label": "Asset Retirement Obligation",
        "periodEndLabel": "Balance",
        "terseLabel": "Estimated future decommissioning cost"
       }
      }
     },
     "localname": "AssetRetirementObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationCurrent": {
     "auth_ref": [
      "r262"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.",
        "label": "Asset Retirement Obligation, Current",
        "terseLabel": "Asset Retirement Obligation, Current"
       }
      }
     },
     "localname": "AssetRetirementObligationCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Asset Retirement Obligation Disclosure [Abstract]",
        "terseLabel": "Asset Retirement Obligation Disclosure [Abstract]"
       }
      }
     },
     "localname": "AssetRetirementObligationDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetRetirementObligationDisclosureTextBlock": {
     "auth_ref": [
      "r267"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.",
        "label": "Asset Retirement Obligation Disclosure [Text Block]",
        "verboseLabel": "Asset Retirement Obligations"
       }
      }
     },
     "localname": "AssetRetirementObligationDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligations"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AssetRetirementObligationLiabilitiesIncurred": {
     "auth_ref": [
      "r263"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset retirement obligations incurred during the period.",
        "label": "Asset Retirement Obligation, Liabilities Incurred",
        "terseLabel": "Additional obligations"
       }
      }
     },
     "localname": "AssetRetirementObligationLiabilitiesIncurred",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationLiabilitiesSettled": {
     "auth_ref": [
      "r264"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.",
        "label": "Asset Retirement Obligation, Liabilities Settled",
        "terseLabel": "Asset Retirement Obligation, Liabilities Settled"
       }
      }
     },
     "localname": "AssetRetirementObligationLiabilitiesSettled",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationPeriodIncreaseDecrease": {
     "auth_ref": [
      "r262"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in asset retirement obligations.",
        "label": "Asset Retirement Obligation, Period Increase (Decrease)",
        "terseLabel": "Increase in ARO liability"
       }
      }
     },
     "localname": "AssetRetirementObligationPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationRevisionOfEstimate": {
     "auth_ref": [
      "r260",
      "r265"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.",
        "label": "Asset Retirement Obligation, Revision of Estimate",
        "terseLabel": "Change in estimate"
       }
      }
     },
     "localname": "AssetRetirementObligationRevisionOfEstimate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationsNoncurrent": {
     "auth_ref": [
      "r262"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.",
        "label": "Asset Retirement Obligations, Noncurrent",
        "terseLabel": "Asset retirement obligations"
       }
      }
     },
     "localname": "AssetRetirementObligationsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetRetirementObligationsPolicy": {
     "auth_ref": [
      "r140",
      "r266"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for legal obligation associated with retirement of long-lived asset that results from acquisition, construction, or development or from normal operation of long-lived asset. Excludes environmental remediation liability from improper or other-than-normal operation of long-lived asset, obligation arising in connection with leased property that meets definition of lease payments or variable lease payments and from plan to sell or otherwise dispose of a long-lived asset.",
        "label": "Asset Retirement Obligation [Policy Text Block]",
        "terseLabel": "Decommissioning Costs",
        "verboseLabel": "Asset Retirement Obligations, Policy"
       }
      }
     },
     "localname": "AssetRetirementObligationsPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsPolicies",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r145",
      "r202",
      "r205",
      "r211",
      "r231",
      "r458",
      "r462",
      "r530",
      "r624",
      "r646"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets [Abstract]",
        "terseLabel": "ASSETS",
        "verboseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsCurrent": {
     "auth_ref": [
      "r7",
      "r9",
      "r72",
      "r145",
      "r231",
      "r458",
      "r462",
      "r530"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets, Current",
        "totalLabel": "Total current assets"
       }
      }
     },
     "localname": "AssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets, Current [Abstract]",
        "terseLabel": "Current assets"
       }
      }
     },
     "localname": "AssetsCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "auth_ref": [
      "r509"
     ],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets, Fair Value Disclosure",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "AssetsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsFairValueDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets, Fair Value Disclosure [Abstract]",
        "terseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsFairValueDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location on balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Axis]",
        "terseLabel": "Balance Sheet Location"
       }
      }
     },
     "localname": "BalanceSheetLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails",
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationDomain": {
     "auth_ref": [
      "r480",
      "r485"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Domain]",
        "terseLabel": "Balance Sheet Location"
       }
      }
     },
     "localname": "BalanceSheetLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails",
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BasisOfAccountingPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
        "label": "Basis of Accounting, Policy [Policy Text Block]",
        "terseLabel": "Basis of Presentation"
       }
      }
     },
     "localname": "BasisOfAccountingPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BusinessAcquisitionAcquireeDomain": {
     "auth_ref": [
      "r411",
      "r418"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.",
        "label": "Business Acquisition, Acquiree [Domain]",
        "terseLabel": "Business Acquisition, Acquiree"
       }
      }
     },
     "localname": "BusinessAcquisitionAcquireeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BusinessAcquisitionAxis": {
     "auth_ref": [
      "r411",
      "r418",
      "r451",
      "r452"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by business combination or series of individually immaterial business combinations.",
        "label": "Business Acquisition [Axis]",
        "terseLabel": "Business Acquisition"
       }
      }
     },
     "localname": "BusinessAcquisitionAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired": {
     "auth_ref": [
      "r448"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of voting equity interests acquired at the acquisition date in the business combination.",
        "label": "Business Acquisition, Percentage of Voting Interests Acquired",
        "terseLabel": "Percentage equity interests acquired"
       }
      }
     },
     "localname": "BusinessAcquisitionPercentageOfVotingInterestsAcquired",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsLeaseLeasebacksDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_BusinessCombinationDisclosureTextBlock": {
     "auth_ref": [
      "r456"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).",
        "label": "Business Combination Disclosure [Text Block]",
        "verboseLabel": "Asset Acquisitions and Business Combinations Disclosure"
       }
      }
     },
     "localname": "BusinessCombinationDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsNotes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets": {
     "auth_ref": [
      "r453"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets acquired at the acquisition date.",
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets",
        "terseLabel": "Fair value of assets acquired"
       }
      }
     },
     "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts": {
     "auth_ref": [
      "r450"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.",
        "label": "Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs",
        "terseLabel": "Fair value of liabilities assumed"
       }
      }
     },
     "localname": "BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized": {
     "auth_ref": [
      "r449"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.",
        "label": "Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized",
        "terseLabel": "Amortization expense of SPE's acquired"
       }
      }
     },
     "localname": "BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses": {
     "auth_ref": [
      "r449"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.",
        "label": "Business Combination, Separately Recognized Transactions, Net Gains and Losses",
        "terseLabel": "Loss on extinguishment"
       }
      }
     },
     "localname": "BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock": {
     "auth_ref": [
      "r2",
      "r152",
      "r198"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the business description and basis of presentation concepts.  Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity.  Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
        "label": "Business Description and Basis of Presentation [Text Block]",
        "terseLabel": "General"
       }
      }
     },
     "localname": "BusinessDescriptionAndBasisOfPresentationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CapitalLeaseObligationsCurrent": {
     "auth_ref": [
      "r24",
      "r555",
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of capital lease obligation due within one year or the normal operating cycle, if longer.",
        "label": "Capital Lease Obligations, Current",
        "terseLabel": "Current portion of leaseback obligations"
       }
      }
     },
     "localname": "CapitalLeaseObligationsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeaseObligationsIncurred": {
     "auth_ref": [
      "r135",
      "r136"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in lease obligation from new lease.",
        "label": "Lease Obligation Incurred",
        "terseLabel": "Capital lease obligations incurred"
       }
      }
     },
     "localname": "CapitalLeaseObligationsIncurred",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeaseObligationsNoncurrent": {
     "auth_ref": [
      "r61",
      "r555",
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.",
        "label": "Capital Lease Obligations, Noncurrent",
        "terseLabel": "Leaseback obligations",
        "verboseLabel": "Capital lease obligations"
       }
      }
     },
     "localname": "CapitalLeaseObligationsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasedAssetsGross": {
     "auth_ref": [
      "r554"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.",
        "label": "Capital Leased Assets, Gross",
        "terseLabel": "Capital leases"
       }
      }
     },
     "localname": "CapitalLeasedAssetsGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet": {
     "auth_ref": [
      "r557"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.",
        "label": "Capital Leases, Balance Sheet, Assets by Major Class, Net",
        "terseLabel": "Capital Leases, Net"
       }
      }
     },
     "localname": "CapitalLeasesBalanceSheetAssetsByMajorClassNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDue": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases.",
        "label": "Capital Leases, Future Minimum Payments Due",
        "terseLabel": "Total",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due, Next Twelve Months",
        "terseLabel": "Capital Leases, Future Minimum Payments Due, Next Twelve Months"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due in Five Years",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueInFiveYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due in Four Years",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueInFourYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due in Three Years",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueInThreeYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due in Two Years",
        "terseLabel": "2019"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueInTwoYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter": {
     "auth_ref": [
      "r558"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_CapitalLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Capital Leases, Future Minimum Payments Due Thereafter",
        "terseLabel": "Capital Leases, Future Minimum Payments Due Thereafter"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsDueThereafter",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments": {
     "auth_ref": [
      "r558"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount necessary to reduce net minimum lease payments to present value for capital leases.",
        "label": "Capital Leases, Future Minimum Payments, Interest Included in Payments",
        "negatedTerseLabel": "Less: amount representing interest"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments": {
     "auth_ref": [
      "r558"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.",
        "label": "Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalizedComputerSoftwareAmortization1": {
     "auth_ref": [
      "r728",
      "r729"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for amortization of capitalized computer software costs.",
        "label": "Capitalized Computer Software, Amortization",
        "terseLabel": "Amortization expense of capitalized computer software costs"
       }
      }
     },
     "localname": "CapitalizedComputerSoftwareAmortization1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CapitalizedComputerSoftwareNet": {
     "auth_ref": [
      "r727"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.",
        "label": "Capitalized Computer Software, Net",
        "terseLabel": "Unamortized computer software costs"
       }
      }
     },
     "localname": "CapitalizedComputerSoftwareNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Cash": {
     "auth_ref": [
      "r42",
      "r680",
      "r681"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "Cash",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r3",
      "r42",
      "r132"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash and Cash Equivalents, at Carrying Value",
        "periodEndLabel": "Cash and cash equivalents at end of the year",
        "periodStartLabel": "Cash and cash equivalents at beginning of the year",
        "terseLabel": "Cash and Cash Equivalents, at Carrying Value"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash and Cash Equivalents [Member]",
        "verboseLabel": "Cash equivalents and other short-term investments"
       }
      }
     },
     "localname": "CashAndCashEquivalentsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.",
        "label": "Cash and Cash Equivalents, Period Increase (Decrease)",
        "totalLabel": "Net change in cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy": {
     "auth_ref": [
      "r19",
      "r133",
      "r140",
      "r623"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Entity's cash and cash equivalents accounting policy with respect to restricted balances.  Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.",
        "label": "Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]",
        "terseLabel": "Cash and Cash Equivalents and Restricted Cash and Investments"
       }
      }
     },
     "localname": "CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r125",
      "r132",
      "r138"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
        "terseLabel": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashFlowSupplementalDisclosuresTextBlock": {
     "auth_ref": [
      "r139"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.",
        "label": "Cash Flow, Supplemental Disclosures [Text Block]",
        "terseLabel": "Supplemental Cash Flow Information"
       }
      }
     },
     "localname": "CashFlowSupplementalDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CertificatesOfDepositMember": {
     "auth_ref": [
      "r640"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short to medium-term investment available at banks and savings and loan institutions where a customer agrees to lend money to the institution for a certain amount of time and is paid a predetermined rate of interest. Certificates of deposit (CD) are typically Federal Deposit Insurance Corporation (FDIC) insured.",
        "label": "Certificates of Deposit [Member]",
        "terseLabel": "Certificates of deposit"
       }
      }
     },
     "localname": "CertificatesOfDepositMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ClassOfStockDomain": {
     "auth_ref": [
      "r143",
      "r145",
      "r175",
      "r176",
      "r177",
      "r179",
      "r180",
      "r186",
      "r187",
      "r188",
      "r231",
      "r530"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock.",
        "label": "Class of Stock [Domain]",
        "terseLabel": "Class of Stock [Domain]"
       }
      }
     },
     "localname": "ClassOfStockDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CoalContractMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to coal.",
        "label": "Coal Contract [Member]",
        "terseLabel": "Coal Contract Derivatives"
       }
      }
     },
     "localname": "CoalContractMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CollateralizedDebtObligationsMember": {
     "auth_ref": [
      "r228",
      "r352"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by a pool of assets.",
        "label": "Collateralized Debt Obligations [Member]",
        "terseLabel": "Asset-backed securities"
       }
      }
     },
     "localname": "CollateralizedDebtObligationsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CollateralizedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by other financial instruments or pools of financial instruments.",
        "label": "Collateralized Securities [Member]",
        "terseLabel": "Collateralized Securities [Member]"
       }
      }
     },
     "localname": "CollateralizedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommitmentsAndContingencies": {
     "auth_ref": [
      "r63",
      "r273",
      "r633",
      "r653"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.",
        "label": "Commitments and Contingencies",
        "terseLabel": "Commitments and contingencies (Note 21)"
       }
      }
     },
     "localname": "CommitmentsAndContingencies",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]",
        "terseLabel": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r270",
      "r271",
      "r272",
      "r283"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for commitments and contingencies.",
        "label": "Commitments and Contingencies Disclosure [Text Block]",
        "terseLabel": "Commitments and Contingencies"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommitmentsFairValueDisclosure": {
     "auth_ref": [
      "r30"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.",
        "label": "Commitments, Fair Value Disclosure",
        "terseLabel": "Commitments, Fair Value Disclosure"
       }
      }
     },
     "localname": "CommitmentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommodityContractAssetNoncurrent": {
     "auth_ref": [
      "r48"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.",
        "label": "Commodity Contract Asset, Noncurrent",
        "terseLabel": "Commodity contract derivative assets"
       }
      }
     },
     "localname": "CommodityContractAssetNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommodityContractMember": {
     "auth_ref": [
      "r352",
      "r493"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to commodity prices.",
        "label": "Commodity Contract [Member]",
        "terseLabel": "Commodity Contract Derivatives",
        "verboseLabel": "Commodity contract derivatives"
       }
      }
     },
     "localname": "CommodityContractMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CompensationAndRetirementDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Retirement Benefits [Abstract]",
        "terseLabel": "Retirement Benefits [Abstract]"
       }
      }
     },
     "localname": "CompensationAndRetirementDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r95",
      "r97",
      "r98",
      "r105",
      "r636",
      "r659"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
        "totalLabel": "Total comprehensive income (loss)"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComputerSoftwareIntangibleAssetMember": {
     "auth_ref": [
      "r250",
      "r251",
      "r454"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Collection of computer programs and related data that provide instructions to a computer, for example, but not limited to, application program, control module or operating system, that perform one or more particular functions or tasks.",
        "label": "Computer Software, Intangible Asset [Member]",
        "terseLabel": "Computer Software, Intangible Asset [Member]"
       }
      }
     },
     "localname": "ComputerSoftwareIntangibleAssetMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ConcentrationRiskPercentage1": {
     "auth_ref": [
      "r193",
      "r194",
      "r216",
      "r525",
      "r526"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the \"benchmark\" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.",
        "label": "Concentration Risk, Percentage",
        "terseLabel": "Percent of total sales by customers"
       }
      }
     },
     "localname": "ConcentrationRiskPercentage1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ConsolidationVariableInterestEntityPolicy": {
     "auth_ref": [
      "r140",
      "r461",
      "r465",
      "r467"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).",
        "label": "Consolidation, Variable Interest Entity, Policy [Policy Text Block]",
        "terseLabel": "Consolidation, Variable Interest Entity, Policy"
       }
      }
     },
     "localname": "ConsolidationVariableInterestEntityPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConstructionInProgressGross": {
     "auth_ref": [
      "r254"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.",
        "label": "Construction in Progress, Gross",
        "terseLabel": "Construction in progress"
       }
      }
     },
     "localname": "ConstructionInProgressGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock": {
     "auth_ref": [
      "r299"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.",
        "label": "Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]",
        "terseLabel": "Contract with Customer, Asset and Liability [Table Text Block]"
       }
      }
     },
     "localname": "ContractWithCustomerAssetAndLiabilityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ContractualObligationDueInNextTwelveMonths": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Contractual Obligation, to be Paid, Year One",
        "terseLabel": "2019"
       }
      }
     },
     "localname": "ContractualObligationDueInNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CorporateDebtSecuritiesMember": {
     "auth_ref": [
      "r352",
      "r402",
      "r679"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.",
        "label": "Corporate Debt Securities [Member]",
        "terseLabel": "Corporate debt securities"
       }
      }
     },
     "localname": "CorporateDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditDefaultSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A type of swap transaction used as a credit derivative in which one party makes periodic payments to the other and receives the promise of a pay-off if a third party defaults.",
        "label": "Credit Default Swap [Member]",
        "verboseLabel": "Credit default swaps"
       }
      }
     },
     "localname": "CreditDefaultSwapMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditFacilityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Axis]",
        "terseLabel": "Credit Facility Agreements",
        "verboseLabel": "Credit Facility Agreements"
       }
      }
     },
     "localname": "CreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditFacilityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Domain]",
        "terseLabel": "Credit Facility [Domain]",
        "verboseLabel": "Credit Facility Agreements"
       }
      }
     },
     "localname": "CreditFacilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditMember": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading in a derivative instrument whose primary underlying risk is tied to the creditworthiness or the credit spread of an entity.",
        "label": "Credit [Member]",
        "terseLabel": "Credit [Member]"
       }
      }
     },
     "localname": "CreditMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CurrencySwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Swap involving the exchange of principal and interest in one currency for another currency.",
        "label": "Currency Swap [Member]",
        "terseLabel": "200 million Sterling currency swap",
        "verboseLabel": "Currency Swap"
       }
      }
     },
     "localname": "CurrencySwapMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtAndCapitalLeaseObligations": {
     "auth_ref": [
      "r629",
      "r656"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of short-term and long-term debt and lease obligation.",
        "label": "Debt and Lease Obligation",
        "terseLabel": "Debt and Lease Obligation"
       }
      }
     },
     "localname": "DebtAndCapitalLeaseObligations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtDefaultShorttermDebtAmount": {
     "auth_ref": [
      "r147"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of outstanding short-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.",
        "label": "Debt Default, Short-term Debt, Amount",
        "terseLabel": "Short-term debt, net of discounts total"
       }
      }
     },
     "localname": "DebtDefaultShorttermDebtAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Disclosure [Abstract]",
        "terseLabel": "Debt Disclosure [Abstract]"
       }
      }
     },
     "localname": "DebtDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r290"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.",
        "label": "Debt Disclosure [Text Block]",
        "verboseLabel": "Debt and Other Obligations"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligations"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r24",
      "r26",
      "r27",
      "r625",
      "r627",
      "r644"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]",
        "terseLabel": "Debt Instrument"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentCallDateEarliest": {
     "auth_ref": [
      "r27",
      "r293",
      "r641"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.",
        "label": "Debt Instrument, Call Date, Earliest",
        "terseLabel": "Call date - earliest"
       }
      }
     },
     "localname": "DebtInstrumentCallDateEarliest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DebtInstrumentCallDateLatest": {
     "auth_ref": [
      "r27",
      "r293",
      "r641"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Latest date before maturity which the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.",
        "label": "Debt Instrument, Call Date, Latest",
        "terseLabel": "Call date - latest"
       }
      }
     },
     "localname": "DebtInstrumentCallDateLatest",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DebtInstrumentFaceAmount": {
     "auth_ref": [
      "r546",
      "r549"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of debt instrument at time of issuance.",
        "label": "Debt Instrument, Face Amount",
        "terseLabel": "Face Amount",
        "verboseLabel": "Secured notes"
       }
      }
     },
     "localname": "DebtInstrumentFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "auth_ref": [
      "r59"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.",
        "label": "Debt Instrument, Interest Rate, Stated Percentage",
        "terseLabel": "Interest rate",
        "verboseLabel": "Coupon rate"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Instrument [Line Items]",
        "terseLabel": "Debt Instrument"
       }
      }
     },
     "localname": "DebtInstrumentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentMaturityDate": {
     "auth_ref": [
      "r60",
      "r514"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.",
        "label": "Debt Instrument, Maturity Date",
        "terseLabel": "Debt Instrument, Maturity Date"
       }
      }
     },
     "localname": "DebtInstrumentMaturityDate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DebtInstrumentMaturityDateRangeEnd1": {
     "auth_ref": [
      "r60"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.",
        "label": "Debt Instrument, Maturity Date Range, End",
        "terseLabel": "Maturity date - latest"
       }
      }
     },
     "localname": "DebtInstrumentMaturityDateRangeEnd1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DebtInstrumentMaturityDateRangeStart1": {
     "auth_ref": [
      "r60"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.",
        "label": "Debt Instrument, Maturity Date Range, Start",
        "terseLabel": "Maturity date - earliest"
       }
      }
     },
     "localname": "DebtInstrumentMaturityDateRangeStart1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r61"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
        "label": "Debt Instrument, Name [Domain]",
        "terseLabel": "Debt Instrument",
        "verboseLabel": "Redemptions/Maturites"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.",
        "label": "Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid",
        "terseLabel": "Holdco balloon payment upon maturity"
       }
      }
     },
     "localname": "DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentRedemptionDescription": {
     "auth_ref": [
      "r642"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Description of debt redemption features under terms of the debt agreement.",
        "label": "Debt Instrument, Redemption, Description",
        "terseLabel": "Debt Instrument, Redemption Period, End Date"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionDescription",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentRedemptionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Instrument, Redemption [Line Items]",
        "terseLabel": "Debt Instrument, Redemption [Line Items]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SubsequentEventsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentRedemptionTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about debt instruments or arrangements with redemption features. Includes, but is not limited to, description of debt redemption features, percentage price at which debt can be redeemed by the issuer, and period start and end for debt maturity or redemption.",
        "label": "Debt Instrument Redemption [Table]",
        "terseLabel": "Debt Instrument Redemption [Table]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SubsequentEventsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentRedemptionTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of debt instruments or arrangements with redemption features. Includes, but is not limited to, description of debt redemption features, percentage price at which debt can be redeemed by the issuer, and period start and end for debt maturity or redemption.",
        "label": "Debt Instrument Redemption [Table Text Block]",
        "terseLabel": "Debt Instrument Redemption [Table Text Block]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SubsequentEventsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentTable": {
     "auth_ref": [
      "r61",
      "r148",
      "r293",
      "r294",
      "r295",
      "r296",
      "r545",
      "r546",
      "r549",
      "r643"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Schedule of Long-term Debt Instruments [Table]",
        "terseLabel": "Debt Securities Activity",
        "verboseLabel": "Maturities Due"
       }
      }
     },
     "localname": "DebtInstrumentTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentTerm": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Debt Instrument, Term",
        "terseLabel": "EnergyRight loan terms"
       }
      }
     },
     "localname": "DebtInstrumentTerm",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedDiscount": {
     "auth_ref": [
      "r545",
      "r549"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of debt discount.",
        "label": "Debt Instrument, Unamortized Discount",
        "terseLabel": "Net discount on sale of Bonds"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedDiscount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet": {
     "auth_ref": [
      "r288",
      "r547"
     ],
     "calculation": {
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_UnsecuredLongTermDebt",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unamortized debt discount (premium) and debt issuance costs.",
        "label": "Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net",
        "terseLabel": "Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet": {
     "auth_ref": [
      "r545",
      "r546",
      "r547",
      "r548",
      "r549"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of debt discount (premium).",
        "label": "Debt Instrument, Unamortized Discount (Premium), Net",
        "terseLabel": "Discount on debt issues"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedDiscountPremiumNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Instruments [Abstract]",
        "terseLabel": "Debt Instruments [Abstract]"
       }
      }
     },
     "localname": "DebtInstrumentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DecommissioningTrustAssetsAmount": {
     "auth_ref": [
      "r261"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.",
        "label": "Decommissioning Fund Investments, Fair Value",
        "verboseLabel": "Balance in the ART"
       }
      }
     },
     "localname": "DecommissioningTrustAssetsAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]",
        "terseLabel": "Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]"
       }
      }
     },
     "localname": "DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DeferredDerivativeGainLossMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of gain (loss) on derivative contracts.",
        "label": "Deferred Derivative Gain (Loss) [Member]",
        "terseLabel": "Unrealized gains/losses on commodity derivatives"
       }
      }
     },
     "localname": "DeferredDerivativeGainLossMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredFinanceCostsGross": {
     "auth_ref": [
      "r547"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.",
        "label": "Debt Issuance Costs, Gross",
        "terseLabel": "Debt issuance costs"
       }
      }
     },
     "localname": "DeferredFinanceCostsGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredFuelCostsMember": {
     "auth_ref": [
      "r714"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of fuel costs incurred.",
        "label": "Deferred Fuel Costs [Member]",
        "terseLabel": "Deferred Fuel Costs [Member]"
       }
      }
     },
     "localname": "DeferredFuelCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredIncomeTaxChargesMember": {
     "auth_ref": [
      "r714",
      "r721",
      "r724",
      "r725"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of income taxes.",
        "label": "Deferred Income Tax Charge [Member]",
        "terseLabel": "Fuel cost adjustment tax equivalents"
       }
      }
     },
     "localname": "DeferredIncomeTaxChargesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredProjectCostsMember": {
     "auth_ref": [
      "r714"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of costs incurred for acquired assets or services.",
        "label": "Deferred Project Costs [Member]",
        "terseLabel": "Deferred Project Costs [Member]"
       }
      }
     },
     "localname": "DeferredProjectCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredRevenueArrangementTypeAxis": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of deferred revenue arrangement.",
        "label": "Deferred Revenue Arrangement Type [Axis]",
        "terseLabel": "Energy Prepayment Obligations and Discounts on Sales"
       }
      }
     },
     "localname": "DeferredRevenueArrangementTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DeferredRevenueArrangementTypeDomain": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Category of obligation arising when an entity receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized.",
        "label": "Deferred Revenue [Domain]",
        "terseLabel": "Energy Prepayment Obligations and Discounts on Sales"
       }
      }
     },
     "localname": "DeferredRevenueArrangementTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredRevenueCurrent": {
     "auth_ref": [
      "r38"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.",
        "label": "Deferred Revenue, Current",
        "terseLabel": "Current portion of energy prepayment obligations"
       }
      }
     },
     "localname": "DeferredRevenueCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredRevenueDescription": {
     "auth_ref": [
      "r11"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Description of the transaction or nature of business giving rise to deferred revenue or unearned revenue, other than annual membership fees. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.",
        "label": "Deferred Revenue, Description",
        "terseLabel": "Deferred Revenue, Description",
        "verboseLabel": "Deferred revenue expected recognition each year"
       }
      }
     },
     "localname": "DeferredRevenueDescription",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DeferredRevenueRevenueRecognized1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue recognized that was previously reported as deferred or unearned revenue.",
        "label": "Deferred Revenue, Revenue Recognized",
        "terseLabel": "Deferred revenue, revenue recognized"
       }
      }
     },
     "localname": "DeferredRevenueRevenueRecognized1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets": {
     "auth_ref": [
      "r341",
      "r402"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.",
        "label": "Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)",
        "terseLabel": "Actual return on plan assets",
        "verboseLabel": "Net realized/unrealized gains"
       }
      }
     },
     "localname": "DefinedBenefitPlanActualReturnOnPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanActuarialGainLoss": {
     "auth_ref": [
      "r334"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.",
        "label": "Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)",
        "negatedTerseLabel": "Actuarial loss (gain)"
       }
      }
     },
     "localname": "DefinedBenefitPlanActuarialGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAdministrationExpenses": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.",
        "label": "Defined Benefit Plan, Plan Assets, Administration Expense",
        "negatedTerseLabel": "Expenses paid"
       }
      }
     },
     "localname": "DefinedBenefitPlanAdministrationExpenses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses": {
     "auth_ref": [
      "r328",
      "r367",
      "r396",
      "r402",
      "r403"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.",
        "label": "Defined Benefit Plan, Amortization of Gain (Loss)",
        "negatedTerseLabel": "Recognized net actuarial loss"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationOfGainsLosses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit": {
     "auth_ref": [
      "r328",
      "r368",
      "r397",
      "r402",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.",
        "label": "Defined Benefit Plan, Amortization of Prior Service Cost (Credit)",
        "terseLabel": "Amortization of prior service credit"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationOfPriorServiceCostCredit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]",
        "terseLabel": "Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanAssetsTransferredToFromPlan": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in plan assets of defined benefit plan from assets transferred into (from) plan.",
        "label": "Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan",
        "terseLabel": "Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssetsTransferredToFromPlan",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate": {
     "auth_ref": [
      "r373"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate",
        "terseLabel": "Discount rate"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease": {
     "auth_ref": [
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase",
        "terseLabel": "Rate of compensation increase"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate": {
     "auth_ref": [
      "r373"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate",
        "terseLabel": "Discount rate"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets": {
     "auth_ref": [
      "r375",
      "r401"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets",
        "terseLabel": "Expected return on plan assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease": {
     "auth_ref": [
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.",
        "label": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase",
        "terseLabel": "Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsNarrativeDescription": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Description of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.",
        "label": "Defined Benefit Plan, Assumptions Used in Calculation, Description",
        "terseLabel": "Defined Benefit Plan, Assumptions Used in Calculation, Description"
       }
      }
     },
     "localname": "DefinedBenefitPlanAssumptionsUsedInCalculationsNarrativeDescription",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanBenefitObligation": {
     "auth_ref": [
      "r329"
     ],
     "calculation": {
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_DefinedBenefitPlanFundedStatusOfPlan",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.",
        "label": "Defined Benefit Plan, Benefit Obligation",
        "terseLabel": "Benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanBenefitObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid": {
     "auth_ref": [
      "r336",
      "r408"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.",
        "label": "Defined Benefit Plan, Benefit Obligation, Benefits Paid",
        "terseLabel": "Benefits paid"
       }
      }
     },
     "localname": "DefinedBenefitPlanBenefitObligationBenefitsPaid",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant": {
     "auth_ref": [
      "r333"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of contributions received by defined benefit plan from participant which increase benefit obligation.",
        "label": "Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant",
        "terseLabel": "Plan participants' contributions"
       }
      }
     },
     "localname": "DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis": {
     "auth_ref": [
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r379",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by defined benefit plan asset investment.",
        "label": "Defined Benefit Plan, Plan Assets, Category [Axis]",
        "terseLabel": "Asset Categories",
        "verboseLabel": "Assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanByPlanAssetCategoriesAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]",
        "terseLabel": "Change in benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanChangeInBenefitObligationRollForward",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]",
        "terseLabel": "Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]"
       }
      }
     },
     "localname": "DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]",
        "terseLabel": "Change in plan assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanContributionsByEmployer": {
     "auth_ref": [
      "r343",
      "r352",
      "r354",
      "r400",
      "r402",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of contribution received by defined benefit plan from employer which increases plan assets.",
        "label": "Defined Benefit Plan, Plan Assets, Contributions by Employer",
        "terseLabel": "Employer contributions"
       }
      }
     },
     "localname": "DefinedBenefitPlanContributionsByEmployer",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanDisclosureLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Defined Benefit Plan Disclosure [Line Items]",
        "terseLabel": "Defined Benefit Plan Disclosure"
       }
      }
     },
     "localname": "DefinedBenefitPlanDisclosureLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1": {
     "auth_ref": [
      "r378"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.",
        "label": "Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation",
        "negatedTerseLabel": "Effect of one percentage point decrease on end-of-year accumulated postretirement benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1": {
     "auth_ref": [
      "r378"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.",
        "label": "Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components",
        "negatedTerseLabel": "Effect of one percentage point decrease on total service and interest cost components"
       }
      }
     },
     "localname": "DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation": {
     "auth_ref": [
      "r378"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.",
        "label": "Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation",
        "terseLabel": "Effect of one percentage point increase on end-of-year accumulated postretirement benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents": {
     "auth_ref": [
      "r378"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.",
        "label": "Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components",
        "terseLabel": "Effect of one percentage point increase on total service and interest cost components"
       }
      }
     },
     "localname": "DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year One",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Five",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payments, Year Five"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Four",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payments, Year Four"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Three",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payments, Year Three"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo": {
     "auth_ref": [
      "r361"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.",
        "label": "Defined Benefit Plan, Expected Future Benefit Payment, Year Two",
        "terseLabel": "Defined Benefit Plan, Expected Future Benefit Payments, Year Two"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": {
     "auth_ref": [
      "r328",
      "r366",
      "r395",
      "r402",
      "r403"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.",
        "label": "Defined Benefit Plan, Expected Return (Loss) on Plan Assets",
        "negatedTerseLabel": "Expected return on plan assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanFairValueOfPlanAssets": {
     "auth_ref": [
      "r340",
      "r352",
      "r354",
      "r355",
      "r402"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.",
        "label": "Defined Benefit Plan, Plan Assets, Amount",
        "terseLabel": "Fair value of net plan assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanFairValueOfPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanFundedStatusOfPlan": {
     "auth_ref": [
      "r326",
      "r349",
      "r402"
     ],
     "calculation": {
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.",
        "label": "Defined Benefit Plan, Funded (Unfunded) Status of Plan",
        "totalLabel": "Funded status"
       }
      }
     },
     "localname": "DefinedBenefitPlanFundedStatusOfPlan",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]",
        "terseLabel": "Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]"
       }
      }
     },
     "localname": "DefinedBenefitPlanFundedStatusOfPlanAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear": {
     "auth_ref": [
      "r377"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.",
        "label": "Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year",
        "terseLabel": "Current health care cost trend rate(2)"
       }
      }
     },
     "localname": "DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanInterestCost": {
     "auth_ref": [
      "r328",
      "r332",
      "r365",
      "r394",
      "r402",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost recognized for passage of time related to defined benefit plan.",
        "label": "Defined Benefit Plan, Interest Cost",
        "terseLabel": "Interest cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanInterestCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": {
     "auth_ref": [
      "r363",
      "r392",
      "r402",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan.",
        "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit)",
        "totalLabel": "Total net period benefit cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanNetPeriodicBenefitCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment": {
     "auth_ref": [
      "r383"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in net periodic benefit cost from effect of change in substantive term of existing defined benefit plan or initiation of new defined benefit plan.",
        "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment",
        "terseLabel": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment"
       }
      }
     },
     "localname": "DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanOtherCosts": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 3.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of defined benefit plan cost (credit), classified as other.",
        "label": "Defined Benefit Plan, Other Cost (Credit)",
        "terseLabel": "Defined Benefit Plan, Other Cost (Credit)"
       }
      }
     },
     "localname": "DefinedBenefitPlanOtherCosts",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets": {
     "auth_ref": [
      "r388"
     ],
     "calculation": {
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_DefinedBenefitPlanFundedStatusOfPlan",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets",
        "terseLabel": "Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation": {
     "auth_ref": [
      "r388"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation",
        "terseLabel": "Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation": {
     "auth_ref": [
      "r388",
      "r389",
      "r402"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation",
        "terseLabel": "Accumulated benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets": {
     "auth_ref": [
      "r388",
      "r389",
      "r402"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets",
        "terseLabel": "Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation": {
     "auth_ref": [
      "r388"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation",
        "terseLabel": "Projected benefit obligation"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPlanAmendments": {
     "auth_ref": [
      "r337"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.",
        "label": "Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment",
        "terseLabel": "Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment"
       }
      }
     },
     "localname": "DefinedBenefitPlanPlanAmendments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage": {
     "auth_ref": [
      "r351",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.",
        "label": "Defined Benefit Plan, Plan Assets, Target Allocation, Percentage",
        "terseLabel": "Target Allocation"
       }
      }
     },
     "localname": "DefinedBenefitPlanPlanAssetsTargetAllocationPercentage",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements": {
     "auth_ref": [
      "r357",
      "r402"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.",
        "label": "Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement",
        "terseLabel": "Purchases, sales, issuances, and settlements, net"
       }
      }
     },
     "localname": "DefinedBenefitPlanPurchasesSalesAndSettlements",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanServiceCost": {
     "auth_ref": [
      "r330",
      "r364",
      "r393",
      "r402",
      "r403"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.",
        "label": "Defined Benefit Plan, Service Cost",
        "terseLabel": "Service cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanServiceCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanTransfersBetweenMeasurementLevels": {
     "auth_ref": [
      "r358",
      "r402"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.",
        "label": "Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3",
        "terseLabel": "Transfers in and/or out of Level 3"
       }
      }
     },
     "localname": "DefinedBenefitPlanTransfersBetweenMeasurementLevels",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1": {
     "auth_ref": [
      "r377"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ultimate trend rate for health care cost for defined benefit postretirement plan.",
        "label": "Defined Benefit Plan, Ultimate Health Care Cost Trend Rate",
        "terseLabel": "Defined Benefit Plan, Ultimate Health Care Cost Trend Rate",
        "verboseLabel": "Ultimate health care cost trend rate"
       }
      }
     },
     "localname": "DefinedBenefitPlanUltimateHealthCareCostTrendRate1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations": {
     "auth_ref": [
      "r351"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.",
        "label": "Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage",
        "terseLabel": "Plan Asset Allocations"
       }
      }
     },
     "localname": "DefinedBenefitPlanWeightedAverageAssetAllocations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate": {
     "auth_ref": [
      "r377"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Year ultimate health care cost trend rate is expected to be reached, in CCYY format.",
        "label": "Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate",
        "terseLabel": "Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate"
       }
      }
     },
     "localname": "DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails"
     ],
     "xbrltype": "gYearListItemType"
    },
    "us-gaap_DefinedContributionPlanCostRecognized": {
     "auth_ref": [
      "r409"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost for defined contribution plan.",
        "label": "Defined Contribution Plan, Cost",
        "terseLabel": "Defined contribution plan contribution amount"
       }
      }
     },
     "localname": "DefinedContributionPlanCostRecognized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Depreciation": {
     "auth_ref": [
      "r130",
      "r253"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.",
        "label": "Depreciation",
        "terseLabel": "Depreciation"
       }
      }
     },
     "localname": "Depreciation",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepreciationAmortizationAndAccretionNet": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.",
        "label": "Depreciation, Amortization and Accretion, Net",
        "verboseLabel": "Depreciation and amortization (including amortization of debt issuance costs and premiums/discounts)"
       }
      }
     },
     "localname": "DepreciationAmortizationAndAccretionNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement": {
     "auth_ref": [
      "r76",
      "r82"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.",
        "label": "Derivative Asset, Not Subject to Master Netting Arrangement",
        "terseLabel": "Commodity derivatives not subject to master netting or similar arrangement"
       }
      }
     },
     "localname": "DerivativeAssetNotSubjectToMasterNettingArrangement",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssets": {
     "auth_ref": [
      "r75",
      "r80",
      "r522"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Asset",
        "terseLabel": "Net Amounts of Assets Presented in the Balance Sheet",
        "verboseLabel": "Coal counterparties in asset position"
       }
      }
     },
     "localname": "DerivativeAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeCollateralRightToReclaimCash": {
     "auth_ref": [
      "r77",
      "r81",
      "r501"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.",
        "label": "Derivative, Collateral, Right to Reclaim Cash",
        "terseLabel": "Collateral obligations"
       }
      }
     },
     "localname": "DerivativeCollateralRightToReclaimCash",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeContractTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial instrument or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.",
        "label": "Derivative Contract [Domain]",
        "terseLabel": "Derivative, Name"
       }
      }
     },
     "localname": "DerivativeContractTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties.",
        "label": "Derivative Credit Risk Valuation Adjustment, Derivative Assets",
        "terseLabel": "Derivative credit valuation adjustment, assets"
       }
      }
     },
     "localname": "DerivativeCreditRiskValuationAdjustmentDerivativeAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity.",
        "label": "Derivative Credit Risk Valuation Adjustment, Derivative Liabilities",
        "terseLabel": "Derivative credit valuation adjustment, liabilities"
       }
      }
     },
     "localname": "DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeAsset": {
     "auth_ref": [
      "r73",
      "r83",
      "r483",
      "r597"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.",
        "label": "Derivative Asset, Fair Value, Gross Asset",
        "terseLabel": "Gross Amounts of Recognized Assets, subject to master netting or similar arrangements"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiability": {
     "auth_ref": [
      "r73",
      "r83",
      "r483",
      "r597"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.",
        "label": "Derivative Liability, Fair Value, Gross Liability",
        "terseLabel": "Derivative Liability, Fair Value, Gross Liability",
        "verboseLabel": "Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeNet": {
     "auth_ref": [
      "r522"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of the assets less the liabilities of a derivative or group of derivatives.",
        "label": "Derivative, Fair Value, Net",
        "negatedLabel": "Net unrealized gains (losses)",
        "terseLabel": "Fair value",
        "verboseLabel": "Unrealized gains (losses) deferred as regulatory liabilities (assets)"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFixedInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fixed interest rate related to the interest rate derivative.",
        "label": "Derivative, Fixed Interest Rate",
        "verboseLabel": "Overall effective cost to TVA"
       }
      }
     },
     "localname": "DerivativeFixedInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DerivativeGainLossOnDerivativeNet": {
     "auth_ref": [
      "r482"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.",
        "label": "Derivative, Gain (Loss) on Derivative, Net",
        "terseLabel": "Amount of gain (loss) recognized in income on derivatives"
       }
      }
     },
     "localname": "DerivativeGainLossOnDerivativeNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeInstrumentRiskAxis": {
     "auth_ref": [
      "r481",
      "r484",
      "r489",
      "r495"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of derivative contract.",
        "label": "Derivative Instrument [Axis]",
        "terseLabel": "Derivative, by Nature"
       }
      }
     },
     "localname": "DerivativeInstrumentRiskAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Derivative Instruments and Hedging Activities Disclosure [Abstract]",
        "terseLabel": "Derivative Instruments and Hedging Activities Disclosure [Abstract]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock": {
     "auth_ref": [
      "r508"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.",
        "label": "Derivative Instruments and Hedging Activities Disclosure [Text Block]",
        "verboseLabel": "Risk Management Activities and Derivative Transactions"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable": {
     "auth_ref": [
      "r477",
      "r481",
      "r489",
      "r495",
      "r496",
      "r503",
      "r505"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.",
        "label": "Derivative Instruments, Gain (Loss) [Table]",
        "terseLabel": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Derivative Instruments, Gain (Loss) [Line Items]",
        "terseLabel": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred": {
     "auth_ref": [
      "r507"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.",
        "label": "Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred",
        "negatedTerseLabel": "Reclassification to earnings from cash flow hedges in the next twelve months",
        "terseLabel": "Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet": {
     "auth_ref": [
      "r488",
      "r504"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.",
        "label": "Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net",
        "terseLabel": "Ineffective portion excluded from testing"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilities": {
     "auth_ref": [
      "r75",
      "r80",
      "r522"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Liability",
        "terseLabel": "Derivative Liability"
       }
      }
     },
     "localname": "DerivativeLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityFairValueGrossAsset": {
     "auth_ref": [
      "r74",
      "r84",
      "r483"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.",
        "label": "Derivative Liability, Fair Value, Gross Asset",
        "terseLabel": "Gross Amounts Offset in the Balance Sheet"
       }
      }
     },
     "localname": "DerivativeLiabilityFairValueGrossAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement": {
     "auth_ref": [
      "r73"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.",
        "label": "Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement": {
     "auth_ref": [
      "r76",
      "r82"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.",
        "label": "Derivative Liability, Not Subject to Master Netting Arrangement",
        "terseLabel": "Total derivatives not subject to master netting or similar arrangement"
       }
      }
     },
     "localname": "DerivativeLiabilityNotSubjectToMasterNettingArrangement",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Derivative [Line Items]",
        "terseLabel": "Derivative"
       }
      }
     },
     "localname": "DerivativeLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativesUnderFinancialTradingProgramDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeNetLiabilityPositionAggregateFairValue": {
     "auth_ref": [
      "r498"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.",
        "label": "Derivative, Net Liability Position, Aggregate Fair Value",
        "terseLabel": "Aggregate fair value of derivative instruments with credit-risk related contingent features that were in a liability position"
       }
      }
     },
     "localname": "DerivativeNetLiabilityPositionAggregateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeNonmonetaryNotionalAmount": {
     "auth_ref": [
      "r474",
      "r476"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nominal number of units used to calculate payment on derivative.",
        "label": "Derivative, Nonmonetary Notional Amount",
        "terseLabel": "Notional amount"
       }
      }
     },
     "localname": "DerivativeNonmonetaryNotionalAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "us-gaap_DerivativeTable": {
     "auth_ref": [
      "r473",
      "r475",
      "r476",
      "r477",
      "r479",
      "r486",
      "r489",
      "r500",
      "r502",
      "r505"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule that describes and identifies a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.",
        "label": "Derivative [Table]",
        "terseLabel": "Derivative"
       }
      }
     },
     "localname": "DerivativeTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCurrencySwapsOutstandingDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativesFairValueLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Derivatives, Fair Value [Line Items]",
        "terseLabel": "Derivatives, Fair Value"
       }
      }
     },
     "localname": "DerivativesFairValueLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisaggregationOfRevenueTable": {
     "auth_ref": [
      "r307",
      "r309",
      "r310",
      "r311",
      "r312",
      "r313",
      "r314",
      "r315"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
        "label": "Disaggregation of Revenue [Table]",
        "terseLabel": "Disaggregation of Revenue [Table]"
       }
      }
     },
     "localname": "DisaggregationOfRevenueTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisaggregationOfRevenueTableTextBlock": {
     "auth_ref": [
      "r307"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
        "label": "Disaggregation of Revenue [Table Text Block]",
        "terseLabel": "Disaggregation of Revenue [Table Text Block]"
       }
      }
     },
     "localname": "DisaggregationOfRevenueTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureOfReclassificationAmountTextBlock": {
     "auth_ref": [
      "r112"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation.",
        "label": "Disclosure of Reclassification Amount [Text Block]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "DisclosureOfReclassificationAmountTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccumulatedOtherComprehensiveIncomeLoss"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ElectricTransmissionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "System used for the electrical transmission of the bulk transport of high voltage power, typically over longer distances, between generating plants and distribution systems. Typically comprised of towers, overhead conductors, underground conduits, roads and trails.",
        "label": "Electric Transmission [Member]",
        "terseLabel": "Transmission"
       }
      }
     },
     "localname": "ElectricTransmissionMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ElectricityGenerationPlantNonNuclearMember": {
     "auth_ref": [
      "r720"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used in connection with non-nuclear electricity generation.",
        "label": "Electricity Generation Plant, Non-Nuclear [Member]",
        "terseLabel": "Electricity Generation Plant, Non-Nuclear"
       }
      }
     },
     "localname": "ElectricityGenerationPlantNonNuclearMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EnergyRelatedInventory": {
     "auth_ref": [
      "r68"
     ],
     "calculation": {
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.",
        "label": "Energy Related Inventory",
        "terseLabel": "Fuel inventory"
       }
      }
     },
     "localname": "EnergyRelatedInventory",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Revenue from External Customer [Line Items]",
        "terseLabel": "Energy Prepayment Obligations and Discounts on Sales"
       }
      }
     },
     "localname": "EntityWideInformationRevenueFromExternalCustomerLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EnvironmentalIssueMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ecological or external issues that require remediation including, but not limited to, restoration or clean up of property, regulatory compliance, or to sell, abandon or dispose of such property.",
        "label": "Environmental Issue [Member]",
        "terseLabel": "Environmental agreements",
        "verboseLabel": "Environmental Agreements"
       }
      }
     },
     "localname": "EnvironmentalIssueMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EnvironmentalRestorationCostsMember": {
     "auth_ref": [
      "r722"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of costs associated with site remediation or other environmental exit costs that may occur on the sale, disposal, abandonment or decommissioning of a property.",
        "label": "Environmental Restoration Costs [Member]",
        "terseLabel": "Environmental cleanup costs - Kingston ash spill"
       }
      }
     },
     "localname": "EnvironmentalRestorationCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Equity [Abstract]",
        "terseLabel": "Equity [Abstract]"
       }
      }
     },
     "localname": "EquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r153",
      "r154",
      "r155",
      "r160",
      "r169",
      "r171",
      "r185",
      "r235",
      "r292",
      "r297",
      "r428",
      "r429",
      "r430",
      "r443",
      "r444",
      "r535",
      "r536",
      "r537",
      "r538",
      "r539",
      "r541",
      "r669",
      "r670",
      "r671"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
        "label": "Equity Component [Domain]",
        "terseLabel": "Equity Component",
        "verboseLabel": "Appropriation Investment"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquityFundsMember": {
     "auth_ref": [
      "r352"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An investment that pools funds from many investors to invest in a combination of underlying investments, primarily equity investments.",
        "label": "Equity Funds [Member]",
        "terseLabel": "Equity Funds [Member]"
       }
      }
     },
     "localname": "EquityFundsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquitySecuritiesMember": {
     "auth_ref": [
      "r20",
      "r25",
      "r229",
      "r645",
      "r694",
      "r695",
      "r696"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ownership interest or right to acquire or dispose of ownership interest in corporations and other legal entities for which ownership interest is represented by shares of common or preferred stock, convertible securities, stock rights, or stock warrants.",
        "label": "Equity Securities [Member]",
        "terseLabel": "Global public equity",
        "verboseLabel": "Equity securities"
       }
      }
     },
     "localname": "EquitySecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r509",
      "r510",
      "r511",
      "r518"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
        "label": "Fair Value, Recurring and Nonrecurring [Table]",
        "terseLabel": "Fair Value, Recurring and Nonrecurring [Table]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock": {
     "auth_ref": [
      "r512"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.",
        "label": "Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]",
        "terseLabel": "Valuation Techniques"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]",
        "terseLabel": "Fair Value Measurements"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]",
        "terseLabel": "Estimated Values of Financial Instruments (Level 2 Valuation)"
       }
      }
     },
     "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTable": {
     "auth_ref": [
      "r509",
      "r523",
      "r524"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value, by Balance Sheet Grouping [Table]",
        "terseLabel": "Estimated Values of Financial Instruments"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTextBlock": {
     "auth_ref": [
      "r509",
      "r523"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value, by Balance Sheet Grouping [Table Text Block]",
        "terseLabel": "Fair Values of TVA Derivatives"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r402",
      "r510",
      "r588",
      "r589",
      "r590"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
        "label": "Fair Value Hierarchy and NAV [Axis]",
        "terseLabel": "Fair Value, Hierarchy",
        "verboseLabel": "Fair Value, Hierarchy"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementBasisAxis": {
     "auth_ref": [
      "r509",
      "r519"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement basis.",
        "label": "Measurement Basis [Axis]",
        "terseLabel": "Measurement Basis [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementBasisAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r509",
      "r510",
      "r513",
      "r514",
      "r520"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Measurement Frequency [Axis]",
        "terseLabel": "Measurement Frequency [Axis]"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis": {
     "auth_ref": [
      "r527",
      "r528",
      "r529"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of credit or market risk.",
        "label": "Concentration of Credit or Market Risk [Axis]",
        "terseLabel": "Nonperformance Risk"
       }
      }
     },
     "localname": "FairValueConcentrationOfRiskDisclosureItemsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueConcentrationOfRiskDisclosureItemsDomain": {
     "auth_ref": [
      "r527",
      "r528",
      "r529"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provides the general information items required or determined to be disclosed with respect to all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties.",
        "label": "Fair Value, Concentration of Risk, Disclosure Items [Domain]",
        "terseLabel": "Nonperformance risk"
       }
      }
     },
     "localname": "FairValueConcentrationOfRiskDisclosureItemsDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]",
        "terseLabel": "Nonperformance Risk"
       }
      }
     },
     "localname": "FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueConcentrationOfRiskTable": {
     "auth_ref": [
      "r525",
      "r527",
      "r528",
      "r529"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of information required and determined to be disclosed concerning all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. Such disclosure may also include quantitative information about the market risks of financial instruments that is consistent with the way the Company manages or adjusts those risks.",
        "label": "Fair Value, Concentration of Risk [Table]",
        "terseLabel": "Nonperformance Risk"
       }
      }
     },
     "localname": "FairValueConcentrationOfRiskTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsNonperformanceRiskDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosureItemAmountsDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value.",
        "label": "Fair Value Measurement [Domain]",
        "terseLabel": "Fair Value Measurement [Domain]",
        "verboseLabel": "Estimated Values of Financial Instruments"
       }
      }
     },
     "localname": "FairValueDisclosureItemAmountsDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]",
        "terseLabel": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "auth_ref": [
      "r516"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
        "label": "Fair Value Disclosures [Text Block]",
        "verboseLabel": "Fair Value Measurements"
       }
      }
     },
     "localname": "FairValueDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r352",
      "r354",
      "r359",
      "r402",
      "r510",
      "r588"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
        "label": "Fair Value, Inputs, Level 1 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 1"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r352",
      "r354",
      "r359",
      "r402",
      "r510",
      "r589"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
        "label": "Fair Value, Inputs, Level 2 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 2"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r402",
      "r510",
      "r590"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Inputs, Level 3 [Member]",
        "terseLabel": "Fair Value, Inputs, Level 3"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]",
        "terseLabel": "Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]"
       }
      }
     },
     "localname": "FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the gain (loss) of assets and liabilities measured at fair value on a recurring basis.",
        "label": "Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table]",
        "terseLabel": "Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table]"
       }
      }
     },
     "localname": "FairValueMeasuredOnRecurringBasisGainLossIncludedInEarningsTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Measurement Frequency [Domain]",
        "terseLabel": "Measurement Frequency [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements": {
     "auth_ref": [
      "r515"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements",
        "terseLabel": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r402",
      "r588",
      "r589",
      "r590"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
        "label": "Fair Value Hierarchy and NAV [Domain]",
        "terseLabel": "Fair Value Hierarchy",
        "verboseLabel": "Fair Value, Measurements, Fair Value Hierarchy"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOtherDerivativeInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs": {
     "auth_ref": [
      "r509",
      "r517"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs",
        "terseLabel": "Balance at beginning/end of period"
       }
      }
     },
     "localname": "FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable": {
     "auth_ref": [
      "r480",
      "r486",
      "r503"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule that discloses the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.",
        "label": "Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]",
        "terseLabel": "Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]"
       }
      }
     },
     "localname": "FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinanceLeaseInterestExpense": {
     "auth_ref": [
      "r562",
      "r565",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest expense on finance lease liability.",
        "label": "Finance Lease, Interest Expense",
        "terseLabel": "Finance Lease, Interest Expense"
       }
      }
     },
     "localname": "FinanceLeaseInterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiability": {
     "auth_ref": [
      "r561",
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease.",
        "label": "Finance Lease, Liability",
        "terseLabel": "Finance Lease, Liability"
       }
      }
     },
     "localname": "FinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesReclassificatonsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r561"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.",
        "label": "Finance Lease, Liability, Noncurrent",
        "terseLabel": "Finance Lease, Liability, Noncurrent"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease.",
        "label": "Finance Lease, Liability, Payment, Due",
        "terseLabel": "Finance Lease, Liability, Payment, Due"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finance Lease, Liability, to be Paid, Year One",
        "terseLabel": "Finance Lease, Liability, to be Paid, Year One"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finance Lease, Liability, to be Paid, Year Five",
        "terseLabel": "Finance Lease, Liability, to be Paid, Year Five"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearFive",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finance Lease, Liability, to be Paid, Year Four",
        "terseLabel": "Finance Lease, Liability, to be Paid, Year Four"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finance Lease, Liability, to be Paid, Year Three",
        "terseLabel": "Finance Lease, Liability, to be Paid, Year Three"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r572"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Finance Lease, Liability, to be Paid, Year Two",
        "terseLabel": "Finance Lease, Liability, to be Paid, Year Two"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAsset": {
     "auth_ref": [
      "r560"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 1.0,
       "parentTag": "tve_TotalLeaseAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of right-of-use asset from finance lease.",
        "label": "Finance Lease, Right-of-Use Asset, after Accumulated Amortization",
        "terseLabel": "Finance Lease, Right-of-Use Asset, after Accumulated Amortization"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAssetAmortization": {
     "auth_ref": [
      "r562",
      "r565",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to right-of-use asset from finance lease.",
        "label": "Finance Lease, Right-of-Use Asset, Amortization",
        "terseLabel": "Finance Lease, Right-of-Use Asset, Amortization"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAssetAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r570",
      "r573"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for finance lease calculated at point in time.",
        "label": "Finance Lease, Weighted Average Discount Rate, Percent",
        "terseLabel": "Finance Lease, Weighted Average Discount Rate, Percent"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r569",
      "r573"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Finance Lease, Weighted Average Remaining Lease Term",
        "terseLabel": "Finance Lease, Weighted Average Remaining Lease Term"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue": {
     "auth_ref": [
      "r622"
     ],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of firm holdings in corporate fixed income securities. Includes pledged and unpledged holdings.",
        "label": "Financial Instruments, Owned, Corporate Debt, at Fair Value",
        "terseLabel": "Corporate debt securities"
       }
      }
     },
     "localname": "FinancialInstrumentsOwnedCorporateDebtAtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialInstrumentsOwnedPhysicalCommoditiesAtFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value as of the balance sheet date of firm holdings in physical commodity contracts (for example, agricultural products, metals and energy). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.",
        "label": "Financial Instruments, Owned, Physical Commodities, at Fair Value",
        "terseLabel": "Commodity contract derivatives",
        "verboseLabel": "Commodity contract derivatives, assets"
       }
      }
     },
     "localname": "FinancialInstrumentsOwnedPhysicalCommoditiesAtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue": {
     "auth_ref": [
      "r622"
     ],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.",
        "label": "Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value",
        "terseLabel": "Government debt securities"
       }
      }
     },
     "localname": "FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FiscalPeriod": {
     "auth_ref": [
      "r457"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.",
        "label": "Fiscal Period, Policy [Policy Text Block]",
        "terseLabel": "Fiscal Year"
       }
      }
     },
     "localname": "FiscalPeriod",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FixedIncomeFundsMember": {
     "auth_ref": [
      "r352"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment that pools funds from investors to invest in a combination of underlying investments, primarily fixed income investments.",
        "label": "Fixed Income Funds [Member]",
        "terseLabel": "Institutional mutual funds"
       }
      }
     },
     "localname": "FixedIncomeFundsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.",
        "label": "Foreign Currency Contracts, Liability, Fair Value Disclosure",
        "terseLabel": "Currency swaps",
        "verboseLabel": "Currency swap liabilities"
       }
      }
     },
     "localname": "ForeignCurrencyContractsLiabilityFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainBeforeTax": {
     "auth_ref": [
      "r533",
      "r534"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.",
        "label": "Foreign Currency Transaction Gain, before Tax",
        "terseLabel": "Foreign Currency Transaction Gain, before Tax"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainLossBeforeTax": {
     "auth_ref": [
      "r531",
      "r532",
      "r533",
      "r534"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.",
        "label": "Foreign Currency Transaction Gain (Loss), before Tax",
        "terseLabel": "Foreign Currency Transaction Gain (Loss), before Tax"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignCurrencyTransactionGainLossUnrealized": {
     "auth_ref": [
      "r131",
      "r533",
      "r534"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.",
        "label": "Foreign Currency Transaction Gain (Loss), Unrealized",
        "terseLabel": "Foreign Currency Transaction Gain (Loss), Unrealized"
       }
      }
     },
     "localname": "ForeignCurrencyTransactionGainLossUnrealized",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignExchangeContractMember": {
     "auth_ref": [
      "r352",
      "r492"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to foreign exchange rates.",
        "label": "Foreign Exchange Contract [Member]",
        "terseLabel": "Foreign currency forward"
       }
      }
     },
     "localname": "ForeignExchangeContractMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ForeignGovernmentDebtSecuritiesMember": {
     "auth_ref": [
      "r352",
      "r679"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt security issued by government not domiciled in United States of America (US).",
        "label": "Debt Security, Government, Non-US [Member]",
        "terseLabel": "Debt securities issued by foreign governments"
       }
      }
     },
     "localname": "ForeignGovernmentDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FossilFuelPlantMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used in connection with the fossil fuel generation of electricity.",
        "label": "Fossil Fuel Plant [Member]",
        "terseLabel": "Coal-fired"
       }
      }
     },
     "localname": "FossilFuelPlantMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FutureMember": {
     "auth_ref": [
      "r490"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Futures contracts are forward-based contracts to make or take delivery of a specified financial instrument, foreign currency, or commodity at a specified future date or during a specified period at as specified price or yield. Futures are standardized contracts traded on an organized exchange.",
        "label": "Future [Member]",
        "terseLabel": "Futures"
       }
      }
     },
     "localname": "FutureMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainLossOnDispositionOfAssets1": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.",
        "label": "Gain (Loss) on Disposition of Assets",
        "terseLabel": "Gain (Loss) on Disposition of Assets"
       }
      }
     },
     "localname": "GainLossOnDispositionOfAssets1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnInvestments": {
     "auth_ref": [
      "r109",
      "r130",
      "r227"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of realized and unrealized gain (loss) on investment.",
        "label": "Gain (Loss) on Investments",
        "terseLabel": "Gain (Loss) on Investments"
       }
      }
     },
     "localname": "GainLossOnInvestments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Statement [Abstract]",
        "terseLabel": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "auth_ref": [
      "r257"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location in the income statement.",
        "label": "Income Statement Location [Axis]",
        "terseLabel": "Income Statement Location [Axis]"
       }
      }
     },
     "localname": "IncomeStatementLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the income statement.",
        "label": "Income Statement Location [Domain]",
        "terseLabel": "Income Statement Location [Domain]"
       }
      }
     },
     "localname": "IncomeStatementLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxPolicyTextBlock": {
     "auth_ref": [
      "r99",
      "r140",
      "r435",
      "r436",
      "r437",
      "r438",
      "r439",
      "r440",
      "r698"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.",
        "label": "Income Tax, Policy [Policy Text Block]",
        "terseLabel": "Tax Equivalents"
       }
      }
     },
     "localname": "IncomeTaxPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.",
        "label": "Increase (Decrease) in Accounts Payable and Accrued Liabilities",
        "terseLabel": "Accounts payable and accrued liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsPayableAndAccruedLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsReceivable": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.",
        "label": "Increase (Decrease) in Accounts Receivable",
        "negatedTerseLabel": "Accounts receivable, net"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInDeferredRevenue": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.",
        "label": "Increase (Decrease) in Deferred Revenue",
        "terseLabel": "MLGW prepayment"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeferredRevenue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInterestPayableNet": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.",
        "label": "Increase (Decrease) in Interest Payable, Net",
        "terseLabel": "Accrued interest"
       }
      }
     },
     "localname": "IncreaseDecreaseInInterestPayableNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInventories": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.",
        "label": "Increase (Decrease) in Inventories",
        "negatedTerseLabel": "Inventories and other current assets, net"
       }
      }
     },
     "localname": "IncreaseDecreaseInInventories",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Increase (Decrease) in Operating Capital [Abstract]",
        "terseLabel": "Changes in current assets and liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.",
        "label": "Increase (Decrease) in Other Operating Assets and Liabilities, Net",
        "negatedTerseLabel": "Other, net"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherOperatingCapitalNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInPostretirementObligations": {
     "auth_ref": [
      "r129"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in obligation for other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.",
        "label": "Increase (Decrease) in Obligation, Other Postretirement Benefits",
        "terseLabel": "Increase (Decrease) in Obligation, Other Postretirement Benefits"
       }
      }
     },
     "localname": "IncreaseDecreaseInPostretirementObligations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndDebtExpense": {
     "auth_ref": [
      "r544"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 4.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and debt related expenses associated with nonoperating financing activities of the entity.",
        "label": "Interest and Debt Expense",
        "terseLabel": "Interest expense"
       }
      }
     },
     "localname": "InterestAndDebtExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r101",
      "r201",
      "r543",
      "r547",
      "r637"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.",
        "label": "Interest Expense",
        "negatedTerseLabel": "Interest Expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Interest Expense [Abstract]",
        "verboseLabel": "Interest expense"
       }
      }
     },
     "localname": "InterestExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestIncomeExpenseNonoperatingNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net amount of nonoperating interest income (expense).",
        "label": "Interest Income (Expense), Nonoperating, Net",
        "terseLabel": "Interest income"
       }
      }
     },
     "localname": "InterestIncomeExpenseNonoperatingNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaid": {
     "auth_ref": [
      "r134"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.",
        "label": "Interest Paid, Including Capitalized Interest, Operating and Investing Activities",
        "terseLabel": "Interest paid"
       }
      }
     },
     "localname": "InterestPaid",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaidNet": {
     "auth_ref": [
      "r124",
      "r126",
      "r134"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.",
        "label": "Interest Paid, Excluding Capitalized Interest, Operating Activities",
        "terseLabel": "Interest Paid, Excluding Capitalized Interest, Operating Activities"
       }
      }
     },
     "localname": "InterestPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPayableCurrent": {
     "auth_ref": [
      "r12",
      "r13",
      "r56"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Interest Payable, Current",
        "verboseLabel": "Accrued interest"
       }
      }
     },
     "localname": "InterestPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPayableCurrentAndNoncurrent": {
     "auth_ref": [
      "r631",
      "r654"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest payable on debt, including, but not limited to, trade payables.",
        "label": "Interest Payable",
        "terseLabel": "Accrued interest"
       }
      }
     },
     "localname": "InterestPayableCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateContractMember": {
     "auth_ref": [
      "r352",
      "r491"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to the right to receive or pay a sum of money at a given interest rate.",
        "label": "Interest Rate Contract [Member]",
        "terseLabel": "Interest Rate Contract"
       }
      }
     },
     "localname": "InterestRateContractMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestRateDerivativeLiabilitiesAtFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.",
        "label": "Interest Rate Derivative Liabilities, at Fair Value",
        "terseLabel": "Interest rate swaps",
        "verboseLabel": "Interest rate swaps"
       }
      }
     },
     "localname": "InterestRateDerivativeLiabilitiesAtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateSwapMember": {
     "auth_ref": [
      "r491"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period.",
        "label": "Interest Rate Swap [Member]",
        "terseLabel": "Interest Rate Swap",
        "verboseLabel": "$476 million notional interest rate swap"
       }
      }
     },
     "localname": "InterestRateSwapMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InventoryDisclosureTextBlock": {
     "auth_ref": [
      "r247"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.",
        "label": "Inventory Disclosure [Text Block]",
        "verboseLabel": "Inventories, Net"
       }
      }
     },
     "localname": "InventoryDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNet"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InventoryNet": {
     "auth_ref": [
      "r4",
      "r68"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      },
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.",
        "label": "Inventory, Net",
        "terseLabel": "Inventories, net",
        "totalLabel": "Inventories, net"
       }
      }
     },
     "localname": "InventoryNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Inventory, Net [Abstract]",
        "terseLabel": "Inventory, Net [Abstract]"
       }
      }
     },
     "localname": "InventoryNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InventoryPolicyTextBlock": {
     "auth_ref": [
      "r14",
      "r69",
      "r140",
      "r182",
      "r244",
      "r245",
      "r247"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.",
        "label": "Inventory, Policy [Policy Text Block]",
        "terseLabel": "Inventories"
       }
      }
     },
     "localname": "InventoryPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InventoryRawMaterialsAndSupplies": {
     "auth_ref": [
      "r67"
     ],
     "calculation": {
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.",
        "label": "Inventory, Raw Materials and Supplies, Gross",
        "terseLabel": "Materials and supplies inventory"
       }
      }
     },
     "localname": "InventoryRawMaterialsAndSupplies",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryValuationReserves": {
     "auth_ref": [
      "r68",
      "r151",
      "r246"
     ],
     "calculation": {
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of valuation reserve for inventory.",
        "label": "Inventory Valuation Reserves",
        "negatedTerseLabel": "Allowance for inventory obsolescence"
       }
      }
     },
     "localname": "InventoryValuationReserves",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentPolicyTextBlock": {
     "auth_ref": [
      "r230",
      "r660"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for investment in financial asset.",
        "label": "Investment, Policy [Policy Text Block]",
        "terseLabel": "Investment Funds"
       }
      }
     },
     "localname": "InvestmentPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InvestmentTypeAxis": {
     "auth_ref": [
      "r682",
      "r683",
      "r684",
      "r685",
      "r686",
      "r687",
      "r688",
      "r689",
      "r690",
      "r691",
      "r692",
      "r693",
      "r694",
      "r695",
      "r696"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of investments.",
        "label": "Investment Type [Axis]",
        "terseLabel": "Investment Type [Axis]"
       }
      }
     },
     "localname": "InvestmentTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentTypeCategorizationMember": {
     "auth_ref": [
      "r682",
      "r683",
      "r684",
      "r685",
      "r686",
      "r687",
      "r688",
      "r689",
      "r690",
      "r691",
      "r692",
      "r693",
      "r694",
      "r695",
      "r696"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset obtained to generate income or appreciate in value.",
        "label": "Investments [Domain]",
        "terseLabel": "Investments [Domain]"
       }
      }
     },
     "localname": "InvestmentTypeCategorizationMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InvestmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investments [Abstract]",
        "terseLabel": "Investments"
       }
      }
     },
     "localname": "InvestmentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentsFairValueDisclosure": {
     "auth_ref": [
      "r509"
     ],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AssetsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.",
        "label": "Investments, Fair Value Disclosure",
        "totalLabel": "Total investments"
       }
      }
     },
     "localname": "InvestmentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseAndRentalExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.",
        "label": "Operating Leases, Rent Expense",
        "terseLabel": "Operating Leases, Rent Expense"
       }
      }
     },
     "localname": "LeaseAndRentalExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseContractualTermAxis": {
     "auth_ref": [
      "r564"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by contractual term of lease arrangement.",
        "label": "Lease Contractual Term [Axis]",
        "terseLabel": "Lease Contractual Term [Axis]"
       }
      }
     },
     "localname": "LeaseContractualTermAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LeaseContractualTermDomain": {
     "auth_ref": [
      "r564"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual term of lease arrangement.",
        "label": "Lease Contractual Term [Domain]",
        "terseLabel": "Lease Contractual Term [Domain]"
       }
      }
     },
     "localname": "LeaseContractualTermDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LeaseCost": {
     "auth_ref": [
      "r571",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lease cost recognized by lessee for lease contract.",
        "label": "Lease, Cost",
        "totalLabel": "Lease, Cost"
       }
      }
     },
     "localname": "LeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeasesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Leases [Abstract]",
        "terseLabel": "Leases [Abstract]"
       }
      }
     },
     "localname": "LeasesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LeasesOfLesseeDisclosureTextBlock": {
     "auth_ref": [
      "r559"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.",
        "label": "Leases of Lessee Disclosure [Text Block]",
        "terseLabel": "Leases of Lessee Disclosure"
       }
      }
     },
     "localname": "LeasesOfLesseeDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LesseeLeaseDescriptionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Lessee, Lease, Description [Line Items]",
        "terseLabel": "Lessee, Lease, Description [Line Items]"
       }
      }
     },
     "localname": "LesseeLeaseDescriptionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails",
      "http://www.tva.gov/role/LeasesDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails",
      "http://www.tva.gov/role/LeasesSoCFDetails",
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeLeaseDescriptionTable": {
     "auth_ref": [
      "r564"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about lessee's leases.",
        "label": "Lessee, Lease, Description [Table]",
        "terseLabel": "Lessee, Lease, Description [Table]"
       }
      }
     },
     "localname": "LesseeLeaseDescriptionTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeLeasesPolicyTextBlock": {
     "auth_ref": [
      "r563"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for leasing arrangement entered into by lessee.",
        "label": "Lessee, Leases [Policy Text Block]",
        "terseLabel": "Lessee, Leases"
       }
      }
     },
     "localname": "LesseeLeasesPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LetterOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).",
        "label": "Letter of Credit [Member]",
        "terseLabel": "Letter of Credit"
       }
      }
     },
     "localname": "LetterOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LettersOfCreditOutstandingAmount": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.",
        "label": "Letters of Credit Outstanding, Amount",
        "terseLabel": "Amount of letters of credit outstanding",
        "verboseLabel": "Amount of letters of credit outstanding"
       }
      }
     },
     "localname": "LettersOfCreditOutstandingAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCollateralDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r55",
      "r145",
      "r206",
      "r231",
      "r459",
      "r462",
      "r463",
      "r530"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "tve_LiabilitiesAndProprietaryCapital",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
        "label": "Liabilities",
        "terseLabel": "Liabilities",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities [Abstract]",
        "terseLabel": "Liabilities"
       }
      }
     },
     "localname": "LiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesCurrent": {
     "auth_ref": [
      "r58",
      "r145",
      "r231",
      "r459",
      "r462",
      "r463",
      "r530"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.",
        "label": "Liabilities, Current",
        "terseLabel": "Liabilities, Current",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "LiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities, Current [Abstract]",
        "terseLabel": "Current liabilities"
       }
      }
     },
     "localname": "LiabilitiesCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesFairValueDisclosure": {
     "auth_ref": [
      "r509"
     ],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial and nonfinancial obligations.",
        "label": "Financial and Nonfinancial Liabilities, Fair Value Disclosure",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "LiabilitiesFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesFairValueDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities, Fair Value Disclosure [Abstract]",
        "terseLabel": "Liabilities"
       }
      }
     },
     "localname": "LiabilitiesFairValueDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesNoncurrent": {
     "auth_ref": [
      "r16",
      "r17",
      "r18",
      "r27",
      "r28",
      "r145",
      "r231",
      "r459",
      "r462",
      "r463",
      "r530"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation due after one year or beyond the normal operating cycle, if longer.",
        "label": "Liabilities, Noncurrent",
        "totalLabel": "Total other liabilities"
       }
      }
     },
     "localname": "LiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesNoncurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities, Noncurrent [Abstract]",
        "terseLabel": "Other liabilities"
       }
      }
     },
     "localname": "LiabilitiesNoncurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCredit": {
     "auth_ref": [
      "r27",
      "r627",
      "r644"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "label": "Long-term Line of Credit",
        "terseLabel": "Credit facility agreements borrowings outstanding"
       }
      }
     },
     "localname": "LineOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Line of Credit Facility [Abstract]",
        "terseLabel": "Line of Credit Facility [Abstract]"
       }
      }
     },
     "localname": "LineOfCreditFacilityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity": {
     "auth_ref": [
      "r52"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Line of Credit Facility, Current Borrowing Capacity",
        "terseLabel": "Current borrowing capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityCurrentBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Line of Credit Facility [Line Items]",
        "terseLabel": "Credit Facility Agreements"
       }
      }
     },
     "localname": "LineOfCreditFacilityLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity": {
     "auth_ref": [
      "r52"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).",
        "label": "Line of Credit Facility, Remaining Borrowing Capacity",
        "terseLabel": "Line of Credit Facility, Remaining Borrowing Capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityRemainingBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityTable": {
     "auth_ref": [
      "r52",
      "r148"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.",
        "label": "Line of Credit Facility [Table]",
        "terseLabel": "Credit Facility Agreements"
       }
      }
     },
     "localname": "LineOfCreditFacilityTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.",
        "label": "Line of Credit [Member]",
        "terseLabel": "Line of Credit"
       }
      }
     },
     "localname": "LineOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock": {
     "auth_ref": [
      "r225"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.",
        "label": "Loans, Notes, Trade and Other Receivables Disclosure [Text Block]",
        "verboseLabel": "Accounts Receivable, Net"
       }
      }
     },
     "localname": "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNet"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LongTermContractForPurchaseOfElectricPowerAxis": {
     "auth_ref": [
      "r713"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by contract related to purchases of electric power.",
        "label": "Long-term Contract for Purchase of Electric Power [Axis]",
        "terseLabel": "Long-term Contract for Purchase of Electric Power [Axis]"
       }
      }
     },
     "localname": "LongTermContractForPurchaseOfElectricPowerAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermContractForPurchaseOfElectricPowerDomain": {
     "auth_ref": [
      "r713"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of long-term contract for purchase of electric power.",
        "label": "Long-term Contract for Purchase of Electric Power [Domain]",
        "terseLabel": "Long-term Contract for Purchase of Electric Power [Domain]"
       }
      }
     },
     "localname": "LongTermContractForPurchaseOfElectricPowerDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsCounterpartyCreditRiskDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermContractsForPurchaseOfElectricPowerTable": {
     "auth_ref": [
      "r713"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Presents detailed element information concerning the terms and significance of long term contracts to purchase power.",
        "label": "Long-term Contracts for Purchase of Electric Power [Table]",
        "terseLabel": "Long-term Contracts for Purchase of Electric Power [Table]"
       }
      }
     },
     "localname": "LongTermContractsForPurchaseOfElectricPowerTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermDebt": {
     "auth_ref": [
      "r27",
      "r289",
      "r627",
      "r649"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long-term Debt",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "LongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtCurrent": {
     "auth_ref": [
      "r54"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long-term Debt, Current Maturities",
        "terseLabel": "Current maturities of power bonds"
       }
      }
     },
     "localname": "LongTermDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, after Year Five",
        "terseLabel": "Thereafter"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, Year One",
        "terseLabel": "2018"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, Year Five",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, Year Four",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, Year Three",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo": {
     "auth_ref": [
      "r150",
      "r286"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Long-Term Debt, Maturity, Year Two",
        "terseLabel": "2019"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtNoncurrent": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long-term Debt, Excluding Current Maturities",
        "terseLabel": "Total long-term debt, net",
        "totalLabel": "Total long-term debt, net"
       }
      }
     },
     "localname": "LongTermDebtNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtNoncurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Long-term Debt, Excluding Current Maturities [Abstract]",
        "terseLabel": "Long-term debt",
        "verboseLabel": "Long-term debt, net"
       }
      }
     },
     "localname": "LongTermDebtNoncurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermInvestments": {
     "auth_ref": [
      "r43"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).",
        "label": "Long-term Investments",
        "terseLabel": "Long-term Investments"
       }
      }
     },
     "localname": "LongTermInvestments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermNotesPayable": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_LongTermDebtNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.",
        "label": "Notes Payable, Noncurrent",
        "terseLabel": "Long-term notes payable"
       }
      }
     },
     "localname": "LongTermNotesPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by category of items purchased under a long-term purchase commitment.",
        "label": "Category of Item Purchased [Axis]",
        "terseLabel": "Category of Item Purchased [Axis]"
       }
      }
     },
     "localname": "LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "General description of the goods or services to be purchased from the counterparty to the long-term purchase commitment.",
        "label": "Long-term Purchase Commitment, Category of Item Purchased [Domain]",
        "terseLabel": "Obligations",
        "verboseLabel": "Long-term Purchase Commitment, Category of Item Purchased [Domain]"
       }
      }
     },
     "localname": "LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermPurchaseCommitmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Long-term Purchase Commitment [Line Items]",
        "terseLabel": "Obligations",
        "verboseLabel": "Long-term Purchase Commitment [Line Items]"
       }
      }
     },
     "localname": "LongTermPurchaseCommitmentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongTermPurchaseCommitmentTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule setting forth key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount.",
        "label": "Long-term Purchase Commitment [Table]",
        "terseLabel": "Obligations"
       }
      }
     },
     "localname": "LongTermPurchaseCommitmentTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesEnergyPrepaymentObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "auth_ref": [
      "r61"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-term debt.",
        "label": "Long-term Debt, Type [Axis]",
        "terseLabel": "Long-term debt"
       }
      }
     },
     "localname": "LongtermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "auth_ref": [
      "r61",
      "r287"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Long-term Debt, Type [Domain]",
        "terseLabel": "Long-term debt"
       }
      }
     },
     "localname": "LongtermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LossContingenciesByNatureOfContingencyAxis": {
     "auth_ref": [
      "r273",
      "r274",
      "r275",
      "r277",
      "r278",
      "r279",
      "r281",
      "r284",
      "r285"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur.",
        "label": "Loss Contingency Nature [Axis]",
        "terseLabel": "Contingencies"
       }
      }
     },
     "localname": "LossContingenciesByNatureOfContingencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Loss Contingencies [Line Items]",
        "terseLabel": "Legal Proceedings",
        "verboseLabel": "Contingencies"
       }
      }
     },
     "localname": "LossContingenciesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesTable": {
     "auth_ref": [
      "r273",
      "r274",
      "r275",
      "r277",
      "r278",
      "r279",
      "r281",
      "r284",
      "r285"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Discloses the specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made. Excludes environmental contingencies, warranties and unconditional purchase obligations.",
        "label": "Loss Contingencies [Table]",
        "terseLabel": "Legal Proceedings",
        "verboseLabel": "Contingencies"
       }
      }
     },
     "localname": "LossContingenciesTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesUnfundedloancommitmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingencyAccrualAtCarryingValue": {
     "auth_ref": [
      "r273"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of loss contingency liability.",
        "label": "Loss Contingency Accrual",
        "terseLabel": "Legal loss contingency accrual"
       }
      }
     },
     "localname": "LossContingencyAccrualAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LossContingencyDamagesSoughtValue": {
     "auth_ref": [
      "r273",
      "r276",
      "r280"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The value (monetary amount) of the award the plaintiff seeks in the legal matter.",
        "label": "Loss Contingency, Damages Sought, Value",
        "terseLabel": "Loss Contingency, Damages Sought, Value"
       }
      }
     },
     "localname": "LossContingencyDamagesSoughtValue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LossContingencyNatureDomain": {
     "auth_ref": [
      "r273",
      "r274",
      "r275",
      "r277",
      "r278",
      "r279",
      "r281",
      "r284",
      "r285"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur. Resolution of the uncertainty may confirm the incurrence of a loss or impairment of an asset or the incurrence of a liability.",
        "label": "Loss Contingency, Nature [Domain]",
        "terseLabel": "Contingencies"
       }
      }
     },
     "localname": "LossContingencyNatureDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MaintenanceCostPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of the accounting policy for maintenance costs.  Does not  include planned major maintenance activities.",
        "label": "Maintenance Cost, Policy [Policy Text Block]",
        "terseLabel": "Maintenance Costs"
       }
      }
     },
     "localname": "MaintenanceCostPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_MortgageBackedSecuritiesMember": {
     "auth_ref": [
      "r228",
      "r352",
      "r354",
      "r402",
      "r679"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by mortgage loans.",
        "label": "Collateralized Mortgage Backed Securities [Member]",
        "terseLabel": "Residential mortgage-backed securities"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MunicipalBondsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Long-term debt securities issued by state, city or local governments or the agencies operated by state, city or local governments.",
        "label": "Municipal Bonds [Member]",
        "terseLabel": "Debt securities issued by state/local governments"
       }
      }
     },
     "localname": "MunicipalBondsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NaturalGasProcessingPlantMember": {
     "auth_ref": [
      "r720"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used in connection with natural gas operations.",
        "label": "Natural Gas Processing Plant [Member]",
        "terseLabel": "Gas and oil-fired"
       }
      }
     },
     "localname": "NaturalGasProcessingPlantMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r125"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
        "label": "Net Cash Provided by (Used in) Financing Activities",
        "totalLabel": "Net cash (used in) provided by financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]",
        "terseLabel": "Cash flows from financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r125"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
        "label": "Net Cash Provided by (Used in) Investing Activities",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]",
        "terseLabel": "Cash flows from investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r125",
      "r128",
      "r131"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
        "label": "Net Cash Provided by (Used in) Operating Activities",
        "totalLabel": "Net cash provided by operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Cash flows from operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r1",
      "r93",
      "r96",
      "r103",
      "r131",
      "r145",
      "r159",
      "r165",
      "r166",
      "r167",
      "r168",
      "r170",
      "r171",
      "r178",
      "r202",
      "r204",
      "r207",
      "r210",
      "r212",
      "r231",
      "r530",
      "r634",
      "r657"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      },
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
        "label": "Net Income (Loss) Attributable to Parent",
        "terseLabel": "Net income (loss)",
        "totalLabel": "Net income (loss)"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "auth_ref": [
      "r157",
      "r158",
      "r161",
      "r162",
      "r172",
      "r173",
      "r174",
      "r236",
      "r237",
      "r316",
      "r317",
      "r318",
      "r319",
      "r431",
      "r445",
      "r446",
      "r447",
      "r605",
      "r606",
      "r607",
      "r673",
      "r674",
      "r675",
      "r676",
      "r678"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.",
        "label": "Accounting Standards Update and Change in Accounting Principle [Text Block]",
        "terseLabel": "Accounting Standards Update and Change in Accounting Principle [Text Block]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretations"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": {
     "auth_ref": [
      "r156",
      "r159",
      "r160",
      "r161",
      "r163",
      "r164",
      "r167",
      "r181",
      "r232",
      "r233",
      "r234",
      "r235",
      "r238",
      "r239",
      "r424",
      "r425",
      "r426",
      "r427",
      "r428",
      "r429",
      "r430",
      "r432",
      "r441",
      "r442",
      "r443",
      "r444",
      "r602",
      "r603",
      "r604",
      "r667",
      "r668",
      "r669",
      "r670",
      "r671",
      "r672",
      "r673",
      "r674",
      "r675",
      "r676",
      "r677",
      "r678"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.",
        "label": "Accounting Standards Update and Change in Accounting Principle [Table]",
        "terseLabel": "New Accounting Pronouncements or Change in Accounting Principle [Table]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1": {
     "auth_ref": [
      "r135",
      "r136",
      "r137"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.",
        "label": "Noncash or Part Noncash Acquisition, Debt Assumed",
        "terseLabel": "Acquisition of notes payable"
       }
      }
     },
     "localname": "NoncashOrPartNoncashAcquisitionDebtAssumed1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesAndLoansReceivableNetNoncurrent": {
     "auth_ref": [
      "r34"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.",
        "label": "Financing Receivable, after Allowance for Credit Loss, Noncurrent",
        "terseLabel": "Loans and other long-term receivables, net"
       }
      }
     },
     "localname": "NotesAndLoansReceivableNetNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesPayable": {
     "auth_ref": [
      "r27",
      "r627",
      "r649"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.",
        "label": "Notes Payable",
        "terseLabel": "Notes Payable",
        "verboseLabel": "Long-term notes payable (including current maturities)"
       }
      }
     },
     "localname": "NotesPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredNotesofSPEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesPayableCurrent": {
     "auth_ref": [
      "r54"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 9.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.",
        "label": "Notes Payable, Current",
        "terseLabel": "Current maturities of notes payable"
       }
      }
     },
     "localname": "NotesPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesPayableOtherPayablesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A written promise to pay a note to a third party.",
        "label": "Notes Payable, Other Payables [Member]",
        "terseLabel": "Notes Payable"
       }
      }
     },
     "localname": "NotesPayableOtherPayablesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NotesReceivableNet": {
     "auth_ref": [
      "r34",
      "r217",
      "r243"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.",
        "label": "Financing Receivable, after Allowance for Credit Loss",
        "terseLabel": "Financing Receivable, after Allowance for Credit Loss"
       }
      }
     },
     "localname": "NotesReceivableNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NuclearFuelNetOfAmortization": {
     "auth_ref": [
      "r45"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel.",
        "label": "Nuclear Fuel, Net of Amortization",
        "terseLabel": "Nuclear fuel"
       }
      }
     },
     "localname": "NuclearFuelNetOfAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NuclearPlantMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used in connection with the generation of nuclear energy.",
        "label": "Nuclear Plant [Member]",
        "terseLabel": "Nuclear"
       }
      }
     },
     "localname": "NuclearPlantMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NumberOfPriceRiskDerivativesHeld": {
     "auth_ref": [
      "r474",
      "r476"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of price risk derivative instruments held by the entity at the reporting date.",
        "label": "Number of Price Risk Derivatives Held",
        "terseLabel": "Number of contracts"
       }
      }
     },
     "localname": "NumberOfPriceRiskDerivativesHeld",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_OffsettingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Offsetting [Abstract]",
        "terseLabel": "Offsetting [Abstract]"
       }
      }
     },
     "localname": "OffsettingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OffsettingAssetsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Offsetting Assets [Line Items]",
        "terseLabel": "Offsetting Assets [Line Items]"
       }
      }
     },
     "localname": "OffsettingAssetsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OffsettingAssetsTable": {
     "auth_ref": [
      "r78",
      "r79"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about derivative and financial assets that are subject to offsetting, including enforceable master netting arrangements.",
        "label": "Offsetting Assets [Table]",
        "terseLabel": "Offsetting Assets [Table]"
       }
      }
     },
     "localname": "OffsettingAssetsTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OffsettingLiabilitiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Offsetting Liabilities [Line Items]",
        "terseLabel": "Offsetting Liabilities [Line Items]"
       }
      }
     },
     "localname": "OffsettingLiabilitiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OffsettingLiabilitiesTable": {
     "auth_ref": [
      "r78",
      "r79"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about derivative and financial liabilities that are subject to offsetting, including enforceable master netting arrangements.",
        "label": "Offsetting Liabilities [Table]",
        "terseLabel": "Offsetting Liabilities [Table]"
       }
      }
     },
     "localname": "OffsettingLiabilitiesTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.",
        "label": "Operating Expenses",
        "totalLabel": "Total operating expenses",
        "verboseLabel": "Operating expenses"
       }
      }
     },
     "localname": "OperatingExpenses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingExpensesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Operating Expenses [Abstract]",
        "terseLabel": "Operating expenses"
       }
      }
     },
     "localname": "OperatingExpensesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingIncomeLoss": {
     "auth_ref": [
      "r202",
      "r204",
      "r207",
      "r210",
      "r212"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net result for the period of deducting operating expenses from operating revenues.",
        "label": "Operating Income (Loss)",
        "terseLabel": "Operating income",
        "totalLabel": "Operating income"
       }
      }
     },
     "localname": "OperatingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseCost": {
     "auth_ref": [
      "r566",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.",
        "label": "Operating Lease, Cost",
        "terseLabel": "Operating Lease, Cost"
       }
      }
     },
     "localname": "OperatingLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiability": {
     "auth_ref": [
      "r561"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.",
        "label": "Operating Lease, Liability",
        "terseLabel": "Operating Lease, Liability"
       }
      }
     },
     "localname": "OperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails",
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r561"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
        "label": "Operating Lease, Liability, Noncurrent",
        "terseLabel": "Operating Lease, Liability, Noncurrent"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseRightOfUseAsset": {
     "auth_ref": [
      "r560"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 2.0,
       "parentTag": "tve_TotalLeaseAssets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's right to use underlying asset under operating lease.",
        "label": "Operating Lease, Right-of-Use Asset",
        "terseLabel": "Operating Lease, Right-of-Use Asset"
       }
      }
     },
     "localname": "OperatingLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/ImpactofNewAccountingStandardsandInterpretationsDetails",
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r570",
      "r573"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for operating lease calculated at point in time.",
        "label": "Operating Lease, Weighted Average Discount Rate, Percent",
        "terseLabel": "Operating Lease, Weighted Average Discount Rate, Percent"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r569",
      "r573"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Operating Lease, Weighted Average Remaining Lease Term",
        "terseLabel": "Operating Lease, Weighted Average Remaining Lease Term"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesWeightedAveragesDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDue": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.",
        "label": "Operating Leases, Future Minimum Payments Due",
        "terseLabel": "Total",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments Due, Next Twelve Months",
        "terseLabel": "Operating Leases, Future Minimum Payments Due, Next Twelve Months"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Five Years",
        "terseLabel": "Operating Leases, Future Minimum Payments, Due in Five Years"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInFiveYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Four Years",
        "terseLabel": "Operating Leases, Future Minimum Payments, Due in Four Years"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInFourYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Three Years",
        "terseLabel": "Operating Leases, Future Minimum Payments, Due in Three Years"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInThreeYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due in Two Years",
        "terseLabel": "Operating Leases, Future Minimum Payments, Due in Two Years"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueInTwoYears",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter": {
     "auth_ref": [
      "r550",
      "r552"
     ],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Operating Leases, Future Minimum Payments, Due Thereafter",
        "terseLabel": "Operating Leases, Future Minimum Payments, Due Thereafter"
       }
      }
     },
     "localname": "OperatingLeasesFutureMinimumPaymentsDueThereafter",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails",
      "http://www.tva.gov/role/LeasesFutureMinimumPaymentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasesRentExpenseNet": {
     "auth_ref": [
      "r551"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.",
        "label": "Operating Leases, Rent Expense, Net",
        "terseLabel": "Operating lease expense"
       }
      }
     },
     "localname": "OperatingLeasesRentExpenseNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OptionMember": {
     "auth_ref": [
      "r472"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contracts conveying rights, but not obligations, to buy or sell a specific commodity, or financial or equity instrument, at a specified price during a specified period (an American option) or at a specified date (a European option) which were purchased or otherwise acquired, excluding options written (for which a premium was received).",
        "label": "Options Held [Member]",
        "terseLabel": "Written options"
       }
      }
     },
     "localname": "OptionMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Organization, Consolidation and Presentation of Financial Statements [Abstract]"
       }
      }
     },
     "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherAssetsCurrent": {
     "auth_ref": [
      "r71"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 5.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current assets classified as other.",
        "label": "Other Assets, Current",
        "terseLabel": "Other current assets"
       }
      }
     },
     "localname": "OtherAssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for other assets. This disclosure includes other current assets and other noncurrent assets.",
        "label": "Other Assets Disclosure [Text Block]",
        "verboseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "OtherAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAssetsMiscellaneousNoncurrent": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.",
        "label": "Other Assets, Miscellaneous, Noncurrent",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherAssetsMiscellaneousNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsNoncurrent": {
     "auth_ref": [
      "r48"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_RegulatedEntityOtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncurrent assets classified as other.",
        "label": "Other Assets, Noncurrent",
        "terseLabel": "Other long-term assets",
        "verboseLabel": "Total other long-term assets"
       }
      }
     },
     "localname": "OtherAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitment": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.",
        "label": "Other Commitment",
        "terseLabel": "Other Commitment",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "OtherCommitment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueAfterFifthYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, after Year Five",
        "terseLabel": "Other Commitment, to be Paid, after Year Five"
       }
      }
     },
     "localname": "OtherCommitmentDueAfterFifthYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueInFifthYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, Year Five",
        "terseLabel": "Other Commitment, to be Paid, Year Five"
       }
      }
     },
     "localname": "OtherCommitmentDueInFifthYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueInFourthYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, Year Four",
        "terseLabel": "Other Commitment, to be Paid, Year Four"
       }
      }
     },
     "localname": "OtherCommitmentDueInFourthYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueInNextTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, Year One",
        "terseLabel": "Other Commitment, to be Paid, Year One"
       }
      }
     },
     "localname": "OtherCommitmentDueInNextTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueInSecondYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, Year Two",
        "terseLabel": "Other Commitment, to be Paid, Year Two"
       }
      }
     },
     "localname": "OtherCommitmentDueInSecondYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentDueInThirdYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OtherCommitment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of commitment classified as other to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).",
        "label": "Other Commitment, to be Paid, Year Three",
        "terseLabel": "Other Commitment, to be Paid, Year Three"
       }
      }
     },
     "localname": "OtherCommitmentDueInThirdYear",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesLeasesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesTableDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCommitmentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information about obligations resulting from other commitments.",
        "label": "Other Commitments [Table Text Block]",
        "terseLabel": "Energy Prepayment Obligations"
       }
      }
     },
     "localname": "OtherCommitmentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLocationAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location in other comprehensive income.",
        "label": "Other Comprehensive Income Location [Axis]",
        "terseLabel": "Other Comprehensive Income Location"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLocationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in other comprehensive income.",
        "label": "Other Comprehensive Income Location [Domain]",
        "terseLabel": "Other Comprehensive Income Location"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r94",
      "r97",
      "r100",
      "r104",
      "r292",
      "r535",
      "r540",
      "r541",
      "r635",
      "r658"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement": {
       "order": 2.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), Net of Tax",
        "terseLabel": "Total other comprehensive income (loss)"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax": {
     "auth_ref": [
      "r87",
      "r90",
      "r91",
      "r478"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).",
        "label": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax",
        "negatedLabel": "Reclassification on cash flow hedges from AOCI to interest expense",
        "negatedTerseLabel": "Reclassification to earnings from cash flow hedges",
        "terseLabel": "Reclassification to earnings from cash flow hedges"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement",
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax": {
     "auth_ref": [
      "r85",
      "r87",
      "r506"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).",
        "label": "Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax",
        "terseLabel": "Net unrealized gain (loss) on cash flow hedges",
        "verboseLabel": "Net unrealized gain (loss) on future cash flow hedges"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSStatement",
      "http://www.tva.gov/role/ProprietaryCapitalAccumulatedOtherComprehensiveIncomeLossDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherContractMember": {
     "auth_ref": [
      "r352",
      "r494"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is classified as other.",
        "label": "Other Contract [Member]",
        "terseLabel": "Commodity derivatives under FTP",
        "verboseLabel": "Other Contract"
       }
      }
     },
     "localname": "OtherContractMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsOffsettingofDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherCostAndExpenseOperating": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 3.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.",
        "label": "Other Cost and Expense, Operating",
        "terseLabel": "Operating and maintenance"
       }
      }
     },
     "localname": "OtherCostAndExpenseOperating",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCreditDerivativesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit derivative contract classified as other.",
        "label": "Other Credit Derivatives [Member]",
        "terseLabel": "Other Credit Derivatives [Member]",
        "verboseLabel": "Derivatives Under FTP"
       }
      }
     },
     "localname": "OtherCreditDerivativesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherCurrentAssetsMember": {
     "auth_ref": [
      "r480",
      "r503"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other current assets.",
        "label": "Other Current Assets [Member]",
        "terseLabel": "Other current assets"
       }
      }
     },
     "localname": "OtherCurrentAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherDepreciationAndAmortization": {
     "auth_ref": [
      "r107",
      "r130",
      "r253"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other.",
        "label": "Other Depreciation and Amortization",
        "terseLabel": "Accelerated depreciation"
       }
      }
     },
     "localname": "OtherDepreciationAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherExpenses": {
     "auth_ref": [
      "r108",
      "r662"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense classified as other.",
        "label": "Other Expenses",
        "terseLabel": "Operating expenses"
       }
      }
     },
     "localname": "OtherExpenses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherIncome": {
     "auth_ref": [
      "r661"
     ],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue and income classified as other.",
        "label": "Other Income",
        "terseLabel": "Other income"
       }
      }
     },
     "localname": "OtherIncome",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherIncomeAndExpensesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Income and Expenses [Abstract]",
        "terseLabel": "Other Income and Expenses [Abstract]"
       }
      }
     },
     "localname": "OtherIncomeAndExpensesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock": {
     "auth_ref": [
      "r321",
      "r433"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions.",
        "label": "Other Income and Other Expense Disclosure [Text Block]",
        "verboseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "OtherIncomeAndOtherExpenseDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNet"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherInventoryNetOfReserves": {
     "auth_ref": [
      "r70",
      "r246"
     ],
     "calculation": {
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_InventoryNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after of valuation reserves and allowances, of inventory, classified as other, expected to be sold, or consumed within one year or operating cycle, if longer.",
        "label": "Other Inventory, Net of Reserves",
        "terseLabel": "RECs inventory, net"
       }
      }
     },
     "localname": "OtherInventoryNetOfReserves",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilitiesDisclosureTextBlock": {
     "auth_ref": [
      "r57"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for other liabilities.",
        "label": "Other Liabilities Disclosure [Text Block]",
        "verboseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherLiabilitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherLiabilitiesNoncurrent": {
     "auth_ref": [
      "r62"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.",
        "label": "Other Liabilities, Noncurrent",
        "terseLabel": "Other long-term liabilities",
        "verboseLabel": "Total other long-term liabilities"
       }
      }
     },
     "localname": "OtherLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilitiesNoncurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Liabilities, Noncurrent [Abstract]",
        "terseLabel": "Other Liabilities, Noncurrent [Abstract]"
       }
      }
     },
     "localname": "OtherLiabilitiesNoncurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherLongTermDebt": {
     "auth_ref": [
      "r27",
      "r627",
      "r649"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt classified as other.",
        "label": "Other Long-term Debt",
        "terseLabel": "Long-term debt of variable interest entities (including current maturities)"
       }
      }
     },
     "localname": "OtherLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLongTermDebtCurrent": {
     "auth_ref": [
      "r24",
      "r26"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 8.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt classified as other, payable within one year or the operating cycle, if longer.",
        "label": "Other Long-term Debt, Current",
        "terseLabel": "Current maturities of long-term debt of variable interest entities issued at par",
        "verboseLabel": "Current maturities of long-term debt of variable interest entities issued at par"
       }
      }
     },
     "localname": "OtherLongTermDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLongTermDebtNoncurrent": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "us-gaap_LongTermDebtNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt classified as other, payable after one year or the operating cycle, if longer.",
        "label": "Other Long-term Debt, Noncurrent",
        "terseLabel": "Long-term debt of variable interest entities, net",
        "verboseLabel": "Long-term debt of variable interest entities, net"
       }
      }
     },
     "localname": "OtherLongTermDebtNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoncurrentAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other noncurrent assets.",
        "label": "Other Noncurrent Assets [Member]",
        "terseLabel": "Other long-term assets"
       }
      }
     },
     "localname": "OtherNoncurrentAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherNoncurrentLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other noncurrent liabilities.",
        "label": "Other Noncurrent Liabilities [Member]",
        "terseLabel": "Other long-term liabilities"
       }
      }
     },
     "localname": "OtherNoncurrentLiabilitiesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesContingenciesDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails",
      "http://www.tva.gov/role/GallatincoalcombustionresidualfacilitiesDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsMarktoMarketValuesofTVADerivativesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherNoncurrentLiabilitiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of other noncurrent liabilities.",
        "label": "Other Noncurrent Liabilities [Table Text Block]",
        "terseLabel": "Other Long-Term Liabilities"
       }
      }
     },
     "localname": "OtherNoncurrentLiabilitiesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherNonoperatingExpense": {
     "auth_ref": [
      "r111"
     ],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense related to nonoperating activities, classified as other.",
        "label": "Other Nonoperating Expense",
        "terseLabel": "Miscellaneous"
       }
      }
     },
     "localname": "OtherNonoperatingExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNonoperatingGainsLosses": {
     "auth_ref": [
      "r110"
     ],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) related to nonoperating activities, classified as other.",
        "label": "Other Nonoperating Gains (Losses)",
        "terseLabel": "Miscellaneous"
       }
      }
     },
     "localname": "OtherNonoperatingGainsLosses",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNonoperatingIncomeExpense": {
     "auth_ref": [
      "r111"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      },
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (expense) related to nonoperating activities, classified as other.",
        "label": "Other Nonoperating Income (Expense)",
        "terseLabel": "Other income (expense), net",
        "totalLabel": "Total other income (expense), net"
       }
      }
     },
     "localname": "OtherNonoperatingIncomeExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherPensionPlansDefinedBenefitMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide retirement benefits, classified as other. Includes, but is not limited to, defined benefit and defined contribution plans.",
        "label": "Other Pension Plan [Member]",
        "terseLabel": "Other Pension Plans, Defined Benefit"
       }
      }
     },
     "localname": "OtherPensionPlansDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherPlantInServiceMember": {
     "auth_ref": [
      "r720"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plant used for the processing, transmission, or distribution of materials, classified as other.",
        "label": "Other Plant in Service [Member]",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherPlantInServiceMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember": {
     "auth_ref": [
      "r323",
      "r326",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r335",
      "r336",
      "r337",
      "r338",
      "r339",
      "r340",
      "r341",
      "r342",
      "r343",
      "r344",
      "r345",
      "r346",
      "r347",
      "r348",
      "r349",
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r361",
      "r362",
      "r363",
      "r364",
      "r365",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r375",
      "r376",
      "r379",
      "r382",
      "r387",
      "r392",
      "r393",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.",
        "label": "Other Postretirement Benefits Plan [Member]",
        "terseLabel": "Other Post-retirement Benefits"
       }
      }
     },
     "localname": "OtherPostretirementBenefitPlansDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherPostretirementBenefitsPayments": {
     "auth_ref": [
      "r127"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit.",
        "label": "Payment for Other Postretirement Benefits",
        "terseLabel": "Other postretirement benefit contributions"
       }
      }
     },
     "localname": "OtherPostretirementBenefitsPayments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherReceivablesGrossCurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AccountsReceivableNetCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.",
        "label": "Other Receivables, Gross, Current",
        "terseLabel": "Other receivables"
       }
      }
     },
     "localname": "OtherReceivablesGrossCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherShortTermBorrowings": {
     "auth_ref": [
      "r49"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.",
        "label": "Other Short-term Borrowings",
        "totalLabel": "Total current debt outstanding, net"
       }
      }
     },
     "localname": "OtherShortTermBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherSignificantNoncashTransactionNameDomain": {
     "auth_ref": [
      "r135",
      "r136",
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The name of other significant noncash (or part noncash) investing and financing activities required to be supplementally disclosed to enable users of the financial information to fully understand the period cash flows of the Entity in relation to the statements of financial position, income statement, and statement of changes in shareholders' equity. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.",
        "label": "Other Significant Noncash Transaction, Name [Domain]",
        "terseLabel": "Supplemental Cash Flow Information"
       }
      }
     },
     "localname": "OtherSignificantNoncashTransactionNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis": {
     "auth_ref": [
      "r135",
      "r136",
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by other significant noncash transactions.",
        "label": "Other Significant Noncash Transaction [Axis]",
        "terseLabel": "Supplemental Cash Flow Information"
       }
      }
     },
     "localname": "OtherSignificantNoncashTransactionsByUniqueDescriptionAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherSignificantNoncashTransactionsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Other Significant Noncash Transactions [Line Items]",
        "terseLabel": "Supplemental Cash Flow Information"
       }
      }
     },
     "localname": "OtherSignificantNoncashTransactionsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherSignificantNoncashTransactionsTable": {
     "auth_ref": [
      "r135",
      "r136",
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This table may contain information related to other significant noncash investing and financing activities that occurred during the accounting period and are not otherwise listed in the existing taxonomy. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.",
        "label": "Other Significant Noncash Transactions [Table]",
        "terseLabel": "Supplemental Cash Flow Information"
       }
      }
     },
     "localname": "OtherSignificantNoncashTransactionsTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SupplementalCashFlowInformation_2"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherSundryLiabilitiesNoncurrent": {
     "auth_ref": [
      "r29",
      "r626",
      "r647"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.",
        "label": "Other Sundry Liabilities, Noncurrent",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherSundryLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromLoansReceivableAlternativeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Payments for (Proceeds from) Loans Receivable, Alternative [Abstract]",
        "verboseLabel": "Loans and other receivables"
       }
      }
     },
     "localname": "PaymentsForProceedsFromLoansReceivableAlternativeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PaymentsForProceedsFromNuclearFuel": {
     "auth_ref": [
      "r149"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow from any material that is commonly used in the generation of nuclear energy.",
        "label": "Payments for (Proceeds from) Nuclear Fuel",
        "negatedLabel": "Nuclear fuel expenditures"
       }
      }
     },
     "localname": "PaymentsForProceedsFromNuclearFuel",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromOtherInvestingActivities": {
     "auth_ref": [
      "r115",
      "r119",
      "r149"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash (inflow) outflow from investing activities classified as other.",
        "label": "Payments for (Proceeds from) Other Investing Activities",
        "negatedLabel": "Other, net"
       }
      }
     },
     "localname": "PaymentsForProceedsFromOtherInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfFinancingCosts": {
     "auth_ref": [
      "r123"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for loan and debt issuance costs.",
        "label": "Payments of Financing Costs",
        "negatedTerseLabel": "Financing costs, net"
       }
      }
     },
     "localname": "PaymentsOfFinancingCosts",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireBusinessesGross": {
     "auth_ref": [
      "r117",
      "r455"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.",
        "label": "Payments to Acquire Businesses, Gross",
        "terseLabel": "Total cash consideration"
       }
      }
     },
     "localname": "PaymentsToAcquireBusinessesGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetAcquisitionsandBusinessCombinationsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireInvestments": {
     "auth_ref": [
      "r119"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the purchase of all investments (debt, security, other) during the period.",
        "label": "Payments to Acquire Investments",
        "negatedTerseLabel": "Purchases of investments"
       }
      }
     },
     "localname": "PaymentsToAcquireInvestments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireLoansReceivable": {
     "auth_ref": [
      "r116"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for the purchase of loan receivable arising from the financing of goods and services.",
        "label": "Payments to Acquire Loans Receivable",
        "negatedLabel": "Advances"
       }
      }
     },
     "localname": "PaymentsToAcquireLoansReceivable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "auth_ref": [
      "r118"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
        "label": "Payments to Acquire Property, Plant, and Equipment",
        "negatedLabel": "Construction expenditures"
       }
      }
     },
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitContributions": {
     "auth_ref": [
      "r127"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.",
        "label": "Payment for Pension and Other Postretirement Benefits",
        "terseLabel": "Contribution related to TVARS case"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitContributions",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/CommitmentsandContingenciesLegalProceedingsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost (reversal of cost) for pension and other postretirement benefits.",
        "label": "Pension and Other Postretirement Benefits Cost (Reversal of Cost)",
        "terseLabel": "Non-cash retirement benefit expense"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock": {
     "auth_ref": [
      "r351",
      "r353",
      "r359",
      "r377",
      "r380",
      "r381",
      "r382",
      "r384",
      "r385",
      "r402",
      "r404",
      "r407",
      "r409",
      "r423"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for retirement benefits.",
        "label": "Retirement Benefits [Text Block]",
        "terseLabel": "Benefit Plans"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlans"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent": {
     "auth_ref": [
      "r29",
      "r326",
      "r327",
      "r349",
      "r402"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.",
        "label": "Liability, Defined Benefit Plan, Noncurrent",
        "negatedTerseLabel": "Pension and post-retirement benefit obligations",
        "terseLabel": "Post-retirement and post-employment benefit obligations"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementPlansPolicy": {
     "auth_ref": [
      "r140",
      "r386",
      "r405",
      "r406",
      "r409",
      "r415"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.",
        "label": "Pension and Other Postretirement Plans, Policy [Policy Text Block]",
        "terseLabel": "Benefit Plans"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementPlansPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PensionContributions": {
     "auth_ref": [
      "r127"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.",
        "label": "Payment for Pension Benefits",
        "negatedTerseLabel": "Pension contributions"
       }
      }
     },
     "localname": "PensionContributions",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionCostsMember": {
     "auth_ref": [
      "r723"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of pension costs.",
        "label": "Pension Costs [Member]",
        "terseLabel": "Pension Costs [Member]"
       }
      }
     },
     "localname": "PensionCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PensionPlansDefinedBenefitMember": {
     "auth_ref": [
      "r322",
      "r326",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r335",
      "r336",
      "r337",
      "r338",
      "r339",
      "r340",
      "r341",
      "r342",
      "r343",
      "r344",
      "r345",
      "r346",
      "r347",
      "r348",
      "r349",
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r363",
      "r364",
      "r365",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r375",
      "r376",
      "r379",
      "r382",
      "r387",
      "r392",
      "r393",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r409",
      "r410",
      "r418",
      "r419",
      "r420",
      "r421"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits.",
        "label": "Pension Plan [Member]",
        "terseLabel": "Pension Benefits"
       }
      }
     },
     "localname": "PensionPlansDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PlanAssetCategoriesDomain": {
     "auth_ref": [
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r379",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined benefit plan asset investment.",
        "label": "Defined Benefit Plan, Plan Assets, Category [Domain]",
        "terseLabel": "Plan Asset Categories",
        "verboseLabel": "Assets"
       }
      }
     },
     "localname": "PlanAssetCategoriesDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PlantRetirementAndAbandonmentPolicy": {
     "auth_ref": [
      "r140",
      "r717",
      "r718",
      "r719"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for plant retirement and for abandonment (under construction or in use) in regulated industries when abandonment becomes probable. Any difference between the new asset and the asset cost is recognized as a loss in the income statement. May also indicate the discount rate used in the calculation of present value of recoverable abandoned assets.",
        "label": "Plant Retirement and Abandonment, Policy [Policy Text Block]",
        "terseLabel": "Plant Retirement and Abandonment, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "PlantRetirementAndAbandonmentPolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/PropertyPlantandEquipmentPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PortionAtFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r521"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured at fair value for financial reporting purposes.",
        "label": "Portion at Fair Value Measurement [Member]",
        "terseLabel": "Portion at Fair Value Measurement [Member]"
       }
      }
     },
     "localname": "PortionAtFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r521"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Not measured at fair value.",
        "label": "Portion at Other than Fair Value Measurement [Member]",
        "terseLabel": "Portion at Other than Fair Value Measurement [Member]"
       }
      }
     },
     "localname": "PortionAtOtherThanFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PostconfirmationOtherPostretirementObligations": {
     "auth_ref": [
      "r582",
      "r583"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncurrent other postretirement obligations at the balance sheet date after fresh-start adjustments.",
        "label": "Postconfirmation, Other Postretirement Obligations",
        "terseLabel": "Postconfirmation, Other Postretirement Obligations"
       }
      }
     },
     "localname": "PostconfirmationOtherPostretirementObligations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PostemploymentBenefitsLiabilityCurrent": {
     "auth_ref": [
      "r56",
      "r324",
      "r325"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable within one year of the balance sheet date.",
        "label": "Postemployment Benefits Liability, Current",
        "terseLabel": "Postemployment Benefits Liability, Current"
       }
      }
     },
     "localname": "PostemploymentBenefitsLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent": {
     "auth_ref": [
      "r324",
      "r325",
      "r632",
      "r655"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.",
        "label": "Postemployment Benefits Liability",
        "terseLabel": "Postemployment benefits liability"
       }
      }
     },
     "localname": "PostemploymentBenefitsLiabilityCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PostemploymentBenefitsLiabilityNoncurrent": {
     "auth_ref": [
      "r324",
      "r325"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer).",
        "label": "Postemployment Benefits Liability, Noncurrent",
        "terseLabel": "Postemployment benefits liability, noncurrent"
       }
      }
     },
     "localname": "PostemploymentBenefitsLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PostemploymentBenefitsPeriodExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period expense related to postemployment benefits.",
        "label": "Postemployment Benefits, Period Expense",
        "terseLabel": "Period expense"
       }
      }
     },
     "localname": "PostemploymentBenefitsPeriodExpense",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansOtherPostemploymentBenefitsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PostretirementBenefitCostsMember": {
     "auth_ref": [
      "r723"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of postretirement benefit costs.",
        "label": "Postretirement Benefit Costs [Member]",
        "terseLabel": "Deferred other post-retirement benefits cost"
       }
      }
     },
     "localname": "PostretirementBenefitCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PrepaidExpenseCurrent": {
     "auth_ref": [
      "r6",
      "r8",
      "r248",
      "r249"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.",
        "label": "Prepaid Expense, Current",
        "terseLabel": "Prepaid Expense, Current"
       }
      }
     },
     "localname": "PrepaidExpenseCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpenseNoncurrent": {
     "auth_ref": [
      "r48"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.",
        "label": "Prepaid Expense, Noncurrent",
        "terseLabel": "Prepaid Expense, Noncurrent"
       }
      }
     },
     "localname": "PrepaidExpenseNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpenseOtherNoncurrent": {
     "auth_ref": [
      "r10",
      "r48"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of amounts paid in advance which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.",
        "label": "Prepaid Expense Other, Noncurrent",
        "terseLabel": "Prepaid capacity payments"
       }
      }
     },
     "localname": "PrepaidExpenseOtherNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PriorPeriodReclassificationAdjustmentDescription": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for reclassification affecting comparability of financial statement. Excludes amendment to accounting standards, other change in accounting principle, and correction of error.",
        "label": "Reclassification, Comparability Adjustment [Policy Text Block]",
        "terseLabel": "Reclassification, Comparability Adjustment"
       }
      }
     },
     "localname": "PriorPeriodReclassificationAdjustmentDescription",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PrivateEquityFundsMember": {
     "auth_ref": [
      "r352"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments held in private equity funds.",
        "label": "Private Equity Funds [Member]",
        "terseLabel": "Private equity",
        "verboseLabel": "Private equity funds measured at net asset value"
       }
      }
     },
     "localname": "PrivateEquityFundsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ProceedsFromCollectionOfLoansReceivable": {
     "auth_ref": [
      "r113"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.",
        "label": "Proceeds from Collection of Loans Receivable",
        "verboseLabel": "Repayments"
       }
      }
     },
     "localname": "ProceedsFromCollectionOfLoansReceivable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfUnsecuredDebt": {
     "auth_ref": [
      "r120"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.",
        "label": "Proceeds from Issuance of Unsecured Debt",
        "terseLabel": "Issues of power bonds"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfUnsecuredDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromOtherDeposits": {
     "auth_ref": [
      "r114"
     ],
     "calculation": {
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherNonoperatingIncomeExpense",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow for receipts of deposits classified as other.",
        "label": "Proceeds from Other Deposits",
        "terseLabel": "Proceeds from Other Deposits"
       }
      }
     },
     "localname": "ProceedsFromOtherDeposits",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities": {
     "auth_ref": [
      "r121",
      "r123",
      "r149"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities classified as other.",
        "label": "Proceeds from (Payments for) Other Financing Activities",
        "terseLabel": "Other, net"
       }
      }
     },
     "localname": "ProceedsFromPaymentsForOtherFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Proceeds from (Repayments of) Long-term Debt and Capital Securities [Abstract]",
        "verboseLabel": "Long-term debt"
       }
      }
     },
     "localname": "ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ProceedsFromRepaymentsOfShortTermDebt": {
     "auth_ref": [
      "r149"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.",
        "label": "Proceeds from (Repayments of) Short-term Debt",
        "terseLabel": "Short-term debt issues (redemptions), net"
       }
      }
     },
     "localname": "ProceedsFromRepaymentsOfShortTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Property, Plant and Equipment [Abstract]",
        "terseLabel": "Property, Plant and Equipment [Abstract]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentAdditions": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.",
        "label": "Property, Plant and Equipment, Additions",
        "terseLabel": "Additions to property, plant, and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentAdditions",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentAndIntangibleAssetsTextBlock": {
     "auth_ref": [
      "r252",
      "r259"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for intangible assets and long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.",
        "label": "Property, Plant, and Equipment and Intangible Assets [Text Block]",
        "terseLabel": "Property, Plant, and Equipment and Intangible Assets"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentAndIntangibleAssetsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlant"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentByTypeAxis": {
     "auth_ref": [
      "r47",
      "r256"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.",
        "label": "Long-Lived Tangible Asset [Axis]",
        "terseLabel": "Net Completed Plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentByTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock": {
     "auth_ref": [
      "r259",
      "r699",
      "r700",
      "r701"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.",
        "label": "Property, Plant and Equipment Disclosure [Text Block]",
        "terseLabel": "Net Completed Plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlant"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentDisposals": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.",
        "label": "Property, Plant and Equipment, Disposals",
        "terseLabel": "Property, Plant and Equipment, Disposals"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentDisposals",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentDispositions": {
     "auth_ref": [
      "r140",
      "r258"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Describes an entity's accounting treatment for disposals of property, plant and equipment, including gains and losses related thereto.",
        "label": "Property, Plant and Equipment, Dispositions",
        "terseLabel": "Property, Plant and Equipment, Dispositions"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentDispositions",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentGross": {
     "auth_ref": [
      "r46",
      "r254"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 2.0,
       "parentTag": "tve_NetCompletedPlant",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment, Gross",
        "terseLabel": "Completed plant",
        "verboseLabel": "Completed plant cost"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentGross",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Property, Plant and Equipment [Line Items]",
        "terseLabel": "Completed Plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment [Member]",
        "terseLabel": "Property, Plant and Equipment [Member]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r21",
      "r22",
      "r256",
      "r652"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 3.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment, Net",
        "totalLabel": "Total property, plant, and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Property, Plant and Equipment, Net [Abstract]",
        "terseLabel": "Property, plant, and equipment"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNetByTypeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Property, Plant and Equipment, Net, by Type [Abstract]",
        "terseLabel": "Property, Plant and Equipment, Net, by Type [Abstract]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNetByTypeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentOtherTypesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Long-lived, physical assets used to produce goods and services and not intended for resale, classified as other.",
        "label": "Property, Plant and Equipment, Other Types [Member]",
        "terseLabel": "Other electrical plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentOtherTypesMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock": {
     "auth_ref": [
      "r44",
      "r140",
      "r256",
      "r699",
      "r700"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections.",
        "label": "Property, Plant and Equipment, Policy [Policy Text Block]",
        "terseLabel": "Property, Plant, and Equipment, and Depreciation"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTextBlock": {
     "auth_ref": [
      "r21",
      "r256"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
        "label": "Property, Plant and Equipment [Table Text Block]",
        "terseLabel": "Net Completed Plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTypeDomain": {
     "auth_ref": [
      "r21",
      "r254"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.",
        "label": "Long-Lived Tangible Asset [Domain]",
        "terseLabel": "Net Completed Plant"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PublicUtilitiesInventoryAxis": {
     "auth_ref": [
      "r39"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of inventory held.",
        "label": "Inventory [Axis]",
        "terseLabel": "Inventories Type"
       }
      }
     },
     "localname": "PublicUtilitiesInventoryAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PublicUtilitiesInventoryLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Public Utilities, Inventory [Line Items]",
        "terseLabel": "Inventories, Net"
       }
      }
     },
     "localname": "PublicUtilitiesInventoryLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PublicUtilitiesInventoryTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Detailed information about the type of inventory held by the utility and the carrying value of this inventory.",
        "label": "Public Utilities, Inventory [Table]",
        "terseLabel": "Inventories, Net"
       }
      }
     },
     "localname": "PublicUtilitiesInventoryTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PublicUtilitiesInventoryTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tangible personal property that is held for sale in the ordinary course of business, in process of production for such sale or is to be currently consumed in the production of goods or services to be available for sale.",
        "label": "Inventory [Domain]",
        "terseLabel": "Inventories Type"
       }
      }
     },
     "localname": "PublicUtilitiesInventoryTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PublicUtilitiesPolicyTextBlock": {
     "auth_ref": [
      "r140",
      "r712"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for public utilities. Examples include a discussion about the scope criteria and appropriateness for and extent of the application of generally accepted accounting principles related to accounting for the effects of certain types of regulation (may include identification of specific business units). Other examples of the disclosures may include: descriptions of the form and economic effects of regulation (for example, but not limited to, recording of regulatory assets and liabilities to the rate setting process); statement about periodic assessments of periodic assessments of generally accepted accounting principles related to accounting for the effects of certain types of regulation; information regarding amortization of and return on regulatory assets and liabilities, including the remaining amounts and recovery or settlement periods; accounting for changes to recovery estimates; AFUDC, plant abandonment's and plant disallowances.",
        "label": "Public Utilities, Policy [Policy Text Block]",
        "terseLabel": "Cost-Based Regulation"
       }
      }
     },
     "localname": "PublicUtilitiesPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Composite depreciation rate for public utility plants in service.",
        "label": "Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service",
        "terseLabel": "Composite depreciation rate for completed plant"
       }
      }
     },
     "localname": "PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPropertyPlantandEquipmentandDepreciationDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis": {
     "auth_ref": [
      "r30",
      "r628",
      "r650"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by arrangement, in which the entity has agreed to expend funds to procure goods or services from one or more suppliers.",
        "label": "Purchase Commitment, Excluding Long-term Commitment [Axis]",
        "terseLabel": "Purchase Obligations"
       }
      }
     },
     "localname": "PurchaseCommitmentExcludingLongtermCommitmentAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain": {
     "auth_ref": [
      "r30",
      "r628",
      "r650"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item is intended to be populated, by the entity, with Members identifying each purchase commitment about which information required or determined to be disclosed is being provided. If only one such commitment exists, this item may be used to capture such information; if multiple commitments exist, this item is the dimensional default, which will aggregate such information, as appropriate.",
        "label": "Purchase Commitment, Excluding Long-term Commitment [Domain]",
        "terseLabel": "Purchase Commitment, Excluding Long-term Commitment [Domain]"
       }
      }
     },
     "localname": "PurchaseCommitmentExcludingLongtermCommitmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesPurchaseObligationsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_QuarterlyFinancialInformationDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Quarterly Financial Information Disclosure [Abstract]",
        "terseLabel": "Quarterly Financial Information Disclosure [Abstract]"
       }
      }
     },
     "localname": "QuarterlyFinancialInformationDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_QuarterlyFinancialInformationTextBlock": {
     "auth_ref": [
      "r184"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information.",
        "label": "Quarterly Financial Information [Text Block]",
        "terseLabel": "Unaudited Quarterly Financial Information"
       }
      }
     },
     "localname": "QuarterlyFinancialInformationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RealEstateFundsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments in funds that invest in commercial or residential real estate.",
        "label": "Real Estate Funds [Member]",
        "terseLabel": "Real Estate Funds [Member]"
       }
      }
     },
     "localname": "RealEstateFundsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RealizedGainLossOnInvestmentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of realized gains and losses on investments reported in the statement of income.",
        "label": "Realized Gain (Loss) on Investments [Table Text Block]",
        "terseLabel": "Financial Trading Program Realized Gains (Losses)"
       }
      }
     },
     "localname": "RealizedGainLossOnInvestmentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ReceivableTypeDomain": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financing arrangement representing a contractual right to receive money either on demand or on fixed and determinable dates.",
        "label": "Receivable [Domain]",
        "terseLabel": "Accounts Receivable Type"
       }
      }
     },
     "localname": "ReceivableTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ReceivablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Receivables [Abstract]"
       }
      }
     },
     "localname": "ReceivablesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReceivablesFromCustomers": {
     "auth_ref": [
      "r621"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.",
        "label": "Receivables from Customers",
        "terseLabel": "Receivables from Customers"
       }
      }
     },
     "localname": "ReceivablesFromCustomers",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReceivablesLongTermContractsOrPrograms": {
     "auth_ref": [
      "r65"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.",
        "label": "Receivables, Long-term Contracts or Programs",
        "terseLabel": "Receivables, Long-term Contracts or Programs"
       }
      }
     },
     "localname": "ReceivablesLongTermContractsOrPrograms",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RecognitionOfDeferredRevenue": {
     "auth_ref": [
      "r131"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.",
        "label": "Recognition of Deferred Revenue",
        "negatedTerseLabel": "Prepayment credits applied to revenue",
        "terseLabel": "Recognition of Deferred Revenue"
       }
      }
     },
     "localname": "RecognitionOfDeferredRevenue",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatedEntityOtherAssetsNoncurrent": {
     "auth_ref": [
      "r48"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of noncurrent other assets held by public utility entities.",
        "label": "Regulated Entity, Other Assets, Noncurrent",
        "totalLabel": "Total regulatory and other long-term assets"
       }
      }
     },
     "localname": "RegulatedEntityOtherAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryAssetAxis": {
     "auth_ref": [
      "r715",
      "r716",
      "r723"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of regulatory asset.",
        "label": "Regulatory Asset [Axis]",
        "terseLabel": "Regulatory Asset"
       }
      }
     },
     "localname": "RegulatoryAssetAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RegulatoryAssetDomain": {
     "auth_ref": [
      "r715"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization of costs incurred.",
        "label": "Regulatory Asset [Domain]",
        "terseLabel": "Regulatory Asset [Domain]"
       }
      }
     },
     "localname": "RegulatoryAssetDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RegulatoryAssets": {
     "auth_ref": [
      "r715"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.",
        "label": "Regulatory Assets",
        "terseLabel": "Regulatory Assets"
       }
      }
     },
     "localname": "RegulatoryAssets",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Regulatory Assets and Liabilities Disclosure [Abstract]",
        "terseLabel": "Regulatory Assets and Liabilities Disclosure [Abstract]"
       }
      }
     },
     "localname": "RegulatoryAssetsAndLiabilitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RegulatoryAssetsCurrent": {
     "auth_ref": [
      "r715"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 4.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.",
        "label": "Regulatory Assets, Current",
        "terseLabel": "Current regulatory assets",
        "verboseLabel": "Regulatory assets"
       }
      }
     },
     "localname": "RegulatoryAssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryAssetsNoncurrent": {
     "auth_ref": [
      "r715"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_RegulatedEntityOtherAssetsNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.",
        "label": "Regulatory Assets, Noncurrent",
        "negatedTotalLabel": "Regulatory assets",
        "terseLabel": "Regulatory assets",
        "verboseLabel": "Regulatory assets"
       }
      }
     },
     "localname": "RegulatoryAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryLiabilities": {
     "auth_ref": [
      "r721"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.",
        "label": "Regulatory Liabilities",
        "terseLabel": "Regulatory Liabilities"
       }
      }
     },
     "localname": "RegulatoryLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryLiabilityAxis": {
     "auth_ref": [
      "r721"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of regulatory liability.",
        "label": "Regulatory Liability [Axis]",
        "terseLabel": "Regulatory Liability"
       }
      }
     },
     "localname": "RegulatoryLiabilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RegulatoryLiabilityCurrent": {
     "auth_ref": [
      "r721"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 5.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.",
        "label": "Regulatory Liability, Current",
        "terseLabel": "Current regulatory liabilities",
        "verboseLabel": "Regulatory liabilities"
       }
      }
     },
     "localname": "RegulatoryLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RegulatoryLiabilityDomain": {
     "auth_ref": [
      "r721"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in accrual of costs or expenses.",
        "label": "Regulatory Liability [Domain]",
        "terseLabel": "Regulatory Liability"
       }
      }
     },
     "localname": "RegulatoryLiabilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RegulatoryLiabilityNoncurrent": {
     "auth_ref": [
      "r62"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 5.0,
       "parentTag": "us-gaap_LiabilitiesNoncurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.",
        "label": "Regulatory Liability, Noncurrent",
        "negatedTerseLabel": "Non-current regulatory liabilities",
        "terseLabel": "Non-current regulatory liabilities",
        "totalLabel": "Non-current regulatory liabilities"
       }
      }
     },
     "localname": "RegulatoryLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails",
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RelatedPartyDomain": {
     "auth_ref": [
      "r379",
      "r576",
      "r577"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Domain]",
        "terseLabel": "Related Party"
       }
      }
     },
     "localname": "RelatedPartyDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RelatedPartyTransactionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Related Party Transaction [Line Items]",
        "terseLabel": "Related Parties"
       }
      }
     },
     "localname": "RelatedPartyTransactionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Related Party Transactions [Abstract]",
        "terseLabel": "Related Party Transactions [Abstract]"
       }
      }
     },
     "localname": "RelatedPartyTransactionsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis": {
     "auth_ref": [
      "r379",
      "r576",
      "r579",
      "r608",
      "r609",
      "r610",
      "r611",
      "r612",
      "r613",
      "r614",
      "r615",
      "r616",
      "r617",
      "r619",
      "r620"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of related party. Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Axis]",
        "terseLabel": "Related Party"
       }
      }
     },
     "localname": "RelatedPartyTransactionsByRelatedPartyAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalDetails",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsDisclosureTextBlock": {
     "auth_ref": [
      "r574",
      "r575",
      "r577",
      "r580",
      "r581"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Related Party Transactions Disclosure [Text Block]",
        "terseLabel": "Related Parties"
       }
      }
     },
     "localname": "RelatedPartyTransactionsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedParties"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RemovalCostsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Rate action of a regulator resulting in capitalization or accrual of removal costs.",
        "label": "Removal Costs [Member]",
        "terseLabel": "Removal Costs [Member]"
       }
      }
     },
     "localname": "RemovalCostsMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesRegulatoryAssetsandLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RepaymentsOfLongTermCapitalLeaseObligations": {
     "auth_ref": [
      "r122"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).",
        "label": "Repayments of Long-term Capital Lease Obligations",
        "negatedLabel": "Payments on leases and leasebacks"
       }
      }
     },
     "localname": "RepaymentsOfLongTermCapitalLeaseObligations",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfNotesPayable": {
     "auth_ref": [
      "r122"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for a borrowing supported by a written promise to pay an obligation.",
        "label": "Repayments of Notes Payable",
        "negatedTerseLabel": "Redemptions of notes payable"
       }
      }
     },
     "localname": "RepaymentsOfNotesPayable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfOtherDebt": {
     "auth_ref": [
      "r122"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for the payment of debt classified as other.",
        "label": "Repayments of Other Debt",
        "terseLabel": "Redemptions/Maturities of notes payable"
       }
      }
     },
     "localname": "RepaymentsOfOtherDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfOtherLongTermDebt": {
     "auth_ref": [
      "r122"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.",
        "label": "Repayments of Other Long-term Debt",
        "negatedTerseLabel": "Payments on debt of variable interest entities",
        "terseLabel": "Redemptions/Maturities of variable interest entities"
       }
      }
     },
     "localname": "RepaymentsOfOtherLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfUnsecuredDebt": {
     "auth_ref": [
      "r122"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.",
        "label": "Repayments of Unsecured Debt",
        "negatedLabel": "Redemptions and repurchases of power bonds",
        "terseLabel": "Redemptions/Maturities of power bonds"
       }
      }
     },
     "localname": "RepaymentsOfUnsecuredDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResearchAndDevelopmentExpensePolicy": {
     "auth_ref": [
      "r140",
      "r434"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for costs it has incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process.",
        "label": "Research and Development Expense, Policy [Policy Text Block]",
        "terseLabel": "Research and Development Costs"
       }
      }
     },
     "localname": "ResearchAndDevelopmentExpensePolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RestrictedCashAndInvestmentsNoncurrent": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.",
        "label": "Restricted Cash and Investments, Noncurrent",
        "terseLabel": "Restricted Cash and Investments, Noncurrent"
       }
      }
     },
     "localname": "RestrictedCashAndInvestmentsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesGeneralDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetirementPlanTypeAxis": {
     "auth_ref": [
      "r322",
      "r323",
      "r326",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r335",
      "r336",
      "r337",
      "r338",
      "r339",
      "r340",
      "r341",
      "r342",
      "r343",
      "r344",
      "r345",
      "r346",
      "r347",
      "r348",
      "r349",
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r363",
      "r364",
      "r365",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r375",
      "r376",
      "r379",
      "r382",
      "r387",
      "r392",
      "r393",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414",
      "r418",
      "r419",
      "r420",
      "r421"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.",
        "label": "Retirement Plan Type [Axis]",
        "terseLabel": "Retirement Plan Type [Axis]"
       }
      }
     },
     "localname": "RetirementPlanTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RetirementPlanTypeDomain": {
     "auth_ref": [
      "r322",
      "r323",
      "r326",
      "r329",
      "r330",
      "r331",
      "r332",
      "r333",
      "r334",
      "r335",
      "r336",
      "r337",
      "r338",
      "r339",
      "r340",
      "r341",
      "r342",
      "r343",
      "r344",
      "r345",
      "r346",
      "r347",
      "r348",
      "r349",
      "r351",
      "r352",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362",
      "r363",
      "r364",
      "r365",
      "r366",
      "r367",
      "r368",
      "r369",
      "r370",
      "r371",
      "r372",
      "r373",
      "r375",
      "r376",
      "r379",
      "r382",
      "r387",
      "r392",
      "r393",
      "r394",
      "r395",
      "r396",
      "r397",
      "r398",
      "r399",
      "r400",
      "r401",
      "r402",
      "r403",
      "r409",
      "r410",
      "r411",
      "r412",
      "r413",
      "r414",
      "r418",
      "r419",
      "r420",
      "r421"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.",
        "label": "Retirement Plan Type [Domain]",
        "terseLabel": "Retirement Plan Type [Domain]"
       }
      }
     },
     "localname": "RetirementPlanTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenue from Contract with Customer [Abstract]",
        "terseLabel": "Revenue from Contract with Customer [Abstract]"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerTextBlock": {
     "auth_ref": [
      "r299",
      "r300",
      "r301",
      "r302",
      "r303",
      "r304",
      "r305",
      "r306",
      "r308",
      "r320"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.",
        "label": "Revenue from Contract with Customer [Text Block]",
        "terseLabel": "Revenue from Contract with Customer"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/Revenue"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenueRecognitionIncentives": {
     "auth_ref": [
      "r140"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for sales incentives.",
        "label": "Revenue Recognition, Incentives [Policy Text Block]",
        "terseLabel": "Revenue Recognition, Incentives [Policy Text Block]"
       }
      }
     },
     "localname": "RevenueRecognitionIncentives",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenueRecognitionPolicyTextBlock": {
     "auth_ref": [
      "r141",
      "r142"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for revenue. Includes revenue from contract with customer and from other sources.",
        "label": "Revenue [Policy Text Block]",
        "terseLabel": "Revenues"
       }
      }
     },
     "localname": "RevenueRecognitionPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenuePolicies",
      "http://www.tva.gov/role/RevenueTables",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenueRecognitionSalesOfServices": {
     "auth_ref": [
      "r140"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for revenue recognition for sales of a service. The entity also may disclose how it recognizes cost of sales for such a service transaction and its treatment of any unearned or deferred revenue that arises from the transaction.",
        "label": "Revenue Recognition, Sales of Services [Policy Text Block]",
        "terseLabel": "Revenue Recognition, Sales of Services [Policy Text Block]"
       }
      }
     },
     "localname": "RevenueRecognitionSalesOfServices",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_Revenues": {
     "auth_ref": [
      "r102",
      "r145",
      "r199",
      "r200",
      "r203",
      "r208",
      "r209",
      "r213",
      "r214",
      "r216",
      "r231",
      "r530",
      "r638"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).",
        "label": "Revenues",
        "terseLabel": "Revenues",
        "verboseLabel": "Revenue from sales of electricity"
       }
      }
     },
     "localname": "Revenues",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails",
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenuesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenues [Abstract]",
        "terseLabel": "Operating revenues"
       }
      }
     },
     "localname": "RevenuesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevolvingCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.",
        "label": "Revolving Credit Facility [Member]",
        "terseLabel": "Revolving Credit Facilities"
       }
      }
     },
     "localname": "RevolvingCreditFacilityMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsCreditFacilityAgreementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule itemizing specific types of trade accounts and notes receivable, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.",
        "label": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]",
        "terseLabel": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]"
       }
      }
     },
     "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetDetails",
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesAllowanceforUncollectibleAccountsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock": {
     "auth_ref": [
      "r66"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.",
        "label": "Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]",
        "terseLabel": "Accounts Receivable, Net"
       }
      }
     },
     "localname": "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AccountsReceivableNetAccountsReceivableNetTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": {
     "auth_ref": [
      "r89",
      "r540",
      "r541"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of accumulated other comprehensive income (loss).",
        "label": "Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]",
        "terseLabel": "Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock": {
     "auth_ref": [
      "r350"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans.  This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.",
        "label": "Schedule of Allocation of Plan Assets [Table Text Block]",
        "terseLabel": "Asset Holdings and Fair Value Measurements"
       }
      }
     },
     "localname": "ScheduleOfAllocationOfPlanAssetsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock": {
     "auth_ref": [
      "r349"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.",
        "label": "Schedule of Amounts Recognized in Balance Sheet [Table Text Block]",
        "terseLabel": "Amounts Recognized on TVA's Consolidated Balance Sheets"
       }
      }
     },
     "localname": "ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock": {
     "auth_ref": [
      "r266"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the carrying amount of a liability for asset retirement obligations.",
        "label": "Schedule of Asset Retirement Obligations [Table Text Block]",
        "terseLabel": "Asset Retirement Obligation Activity"
       }
      }
     },
     "localname": "ScheduleOfAssetRetirementObligationsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/AssetRetirementObligationsAssetRetirementObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock": {
     "auth_ref": [
      "r388",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets.",
        "label": "Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block]",
        "terseLabel": "Obligations and Funded Status"
       }
      }
     },
     "localname": "ScheduleOfBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDebtTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.",
        "label": "Schedule of Debt [Table Text Block]",
        "terseLabel": "Debt Outstanding"
       }
      }
     },
     "localname": "ScheduleOfDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable": {
     "auth_ref": [
      "r386",
      "r387",
      "r390",
      "r391",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosures about an individual defined benefit pension plan or an other postretirement defined benefit plan. It may be appropriate to group certain similar plans.  Also includes schedule for fair value of plan assets by major categories of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
        "label": "Schedule of Defined Benefit Plans Disclosures [Table]",
        "terseLabel": "Schedule of Defined Benefit Plans Disclosures"
       }
      }
     },
     "localname": "ScheduleOfDefinedBenefitPlansDisclosuresTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansActuarialAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansAmountsRecognizedonTVAsConsolidatedBalanceSheetsDetails",
      "http://www.tva.gov/role/BenefitPlansAssetHoldingsDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofBenefitPlansDetails",
      "http://www.tva.gov/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails",
      "http://www.tva.gov/role/BenefitPlansContributionsDetails",
      "http://www.tva.gov/role/BenefitPlansEstimatedFutureBenefitPaymentsDetails",
      "http://www.tva.gov/role/BenefitPlansExpectedAmortizationofRegulatoryAssetsinNextFiscalYearDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails",
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsUsingSignificantUnobservableInputsDetails",
      "http://www.tva.gov/role/BenefitPlansObligationsandFundedStatusDetails",
      "http://www.tva.gov/role/BenefitPlansPostretirementBenefitCostsDeferredasRegulatoryAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansProjectedBenefitObligationsandAccumulatedBenefitObligationsinExessofPlanAssetsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoCertainChangesinPensionAssumptionsDetails",
      "http://www.tva.gov/role/BenefitPlansSensitivitytoChangesinAssumedHealthCareCostTrendRatesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock": {
     "auth_ref": [
      "r487"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period.",
        "label": "Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]",
        "terseLabel": "Summary of Derivative Instruments That Receive Hedge Accounting Treatment"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsEffectOnOtherComprehensiveIncomeLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock": {
     "auth_ref": [
      "r481",
      "r489",
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.",
        "label": "Derivative Instruments, Gain (Loss) [Table Text Block]",
        "terseLabel": "Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsTextBlock": {
     "auth_ref": [
      "r473",
      "r475",
      "r476",
      "r477",
      "r479",
      "r486",
      "r489",
      "r500",
      "r502"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.",
        "label": "Schedule of Derivative Instruments [Table Text Block]",
        "terseLabel": "Commodity Contract Derivatives"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock": {
     "auth_ref": [
      "r378"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.",
        "label": "Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]",
        "terseLabel": "Sensitivity to Changes in Assumed Health Care Cost Trend Rates"
       }
      }
     },
     "localname": "ScheduleOfEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock": {
     "auth_ref": [
      "r355"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.",
        "label": "Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]",
        "terseLabel": "Fair Value Measurements Using Significant Unobservable Inputs"
       }
      }
     },
     "localname": "ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable": {
     "auth_ref": [
      "r213"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular presentation of the description and amount of revenues from a product or service, or a group of similar products or similar services, reported from external customers during the period, if the information is not provided as part of the reportable operating segment information.",
        "label": "Revenue from External Customers by Products and Services [Table]",
        "terseLabel": "Energy Prepayment Obligations and Discounts on Sales"
       }
      }
     },
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesEnergyPrepaymentObligationsandDiscountsonSalesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable": {
     "auth_ref": [
      "r216"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure about the extent of the entity's reliance on its major customers.",
        "label": "Schedule of Revenue by Major Customers, by Reporting Segments [Table]",
        "terseLabel": "Statement [Table]"
       }
      }
     },
     "localname": "ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RevenueCustomerTypeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock": {
     "auth_ref": [
      "r361"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.",
        "label": "Schedule of Expected Benefit Payments [Table Text Block]",
        "terseLabel": "Estimated Future Benefit Payments"
       }
      }
     },
     "localname": "ScheduleOfExpectedBenefitPaymentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": {
     "auth_ref": [
      "r509",
      "r510"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
        "label": "Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]",
        "terseLabel": "Fair Value Measurements"
       }
      }
     },
     "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock": {
     "auth_ref": [
      "r558"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value.",
        "label": "Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]",
        "terseLabel": "Schedule of Future Minimum Lease Payments for Capital Leases"
       }
      }
     },
     "localname": "ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock": {
     "auth_ref": [
      "r553"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.",
        "label": "Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]",
        "terseLabel": "Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfInventoryCurrentTableTextBlock": {
     "auth_ref": [
      "r14",
      "r39",
      "r40",
      "r41"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.",
        "label": "Schedule of Inventory, Current [Table Text Block]",
        "terseLabel": "Inventories, Net"
       }
      }
     },
     "localname": "ScheduleOfInventoryCurrentTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/InventoriesNetInventoriesNetTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock": {
     "auth_ref": [
      "r52",
      "r148"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.",
        "label": "Schedule of Line of Credit Facilities [Table Text Block]",
        "terseLabel": "Summary of Long-Term Credit Facilities"
       }
      }
     },
     "localname": "ScheduleOfLineOfCreditFacilitiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": {
     "auth_ref": [
      "r286"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of maturity and sinking fund requirement for long-term debt.",
        "label": "Schedule of Maturities of Long-term Debt [Table Text Block]",
        "terseLabel": "Maturities Due in the Year Ending September 30"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": {
     "auth_ref": [
      "r363"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.",
        "label": "Schedule of Net Benefit Costs [Table Text Block]",
        "terseLabel": "Components of Net Periodic Benefit Cost"
       }
      }
     },
     "localname": "ScheduleOfNetBenefitCostsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansBenefitPlansTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock": {
     "auth_ref": [
      "r48"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of noncurrent assets.",
        "label": "Schedule of Other Assets, Noncurrent [Table Text Block]",
        "terseLabel": "Other Long-Term Assets"
       }
      }
     },
     "localname": "ScheduleOfOtherAssetsNoncurrentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items.",
        "label": "Schedule of Other Nonoperating Income (Expense) [Table Text Block]",
        "terseLabel": "Other Income (Expense), Net"
       }
      }
     },
     "localname": "ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherIncomeExpenseNetOtherIncomeExpenseNetTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable": {
     "auth_ref": [
      "r47",
      "r256"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
        "label": "Property, Plant and Equipment [Table]",
        "terseLabel": "Net Completed Plant"
       }
      }
     },
     "localname": "ScheduleOfPropertyPlantAndEquipmentTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/NetCompletedPlantNetCompletedPlantDetails",
      "http://www.tva.gov/role/PlantClosuresDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock": {
     "auth_ref": [
      "r183"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data.",
        "label": "Quarterly Financial Information [Table Text Block]",
        "terseLabel": "Unaudited Quarterly Financial Information"
       }
      }
     },
     "localname": "ScheduleOfQuarterlyFinancialInformationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/UnauditedQuarterlyFinancialInformationUnauditedQuarterlyFinancialInformationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit.",
        "label": "Schedule of Regulatory Assets and Liabilities [Text Block]",
        "terseLabel": "Regulatory Assets and Liabilities"
       }
      }
     },
     "localname": "ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RegulatoryAssetsandLiabilitiesTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable": {
     "auth_ref": [
      "r146",
      "r578",
      "r579"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of quantitative and qualitative information pertaining to related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Schedule of Related Party Transactions, by Related Party [Table]",
        "verboseLabel": "Related Parties"
       }
      }
     },
     "localname": "ScheduleOfRelatedPartyTransactionsByRelatedPartyTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.",
        "label": "Schedule of Related Party Transactions [Table Text Block]",
        "terseLabel": "Related Party Transactions"
       }
      }
     },
     "localname": "ScheduleOfRelatedPartyTransactionsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RelatedPartiesRelatedPartiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShortTermDebtTextBlock": {
     "auth_ref": [
      "r53"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.",
        "label": "Schedule of Short-term Debt [Table Text Block]",
        "terseLabel": "Schedule of short-term borrowings"
       }
      }
     },
     "localname": "ScheduleOfShortTermDebtTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfVariableInterestEntitiesTable": {
     "auth_ref": [
      "r458",
      "r459",
      "r462",
      "r463",
      "r464",
      "r466",
      "r468",
      "r469",
      "r470"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of qualitative and quantitative information related to variable interests the entity holds, whether or not such variable interest entity (VIE) is included in the reporting entity's consolidated financial statements. Includes, but is not limited to, description of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a tabular comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.",
        "label": "Schedule of Variable Interest Entities [Table]",
        "terseLabel": "Variable Interest Entities"
       }
      }
     },
     "localname": "ScheduleOfVariableInterestEntitiesTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfVariableInterestEntitiesTextBlock": {
     "auth_ref": [
      "r464",
      "r466",
      "r468",
      "r469",
      "r470"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.",
        "label": "Schedule of Variable Interest Entities [Table Text Block]",
        "terseLabel": "Summary of Impact of VIEs on Consolidated Balance Sheets"
       }
      }
     },
     "localname": "ScheduleOfVariableInterestEntitiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember": {
     "auth_ref": [
      "r522"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.",
        "label": "Securities Sold under Agreements to Repurchase [Member]",
        "terseLabel": "Securities Sold under Agreements to Repurchase [Member]"
       }
      }
     },
     "localname": "SecuritiesSoldUnderAgreementsToRepurchaseMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount": {
     "auth_ref": [
      "r291"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.",
        "label": "Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount",
        "terseLabel": "Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount"
       }
      }
     },
     "localname": "SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CommitmentsandContingenciesMembershipInterestsofVIESubjecttoMandatoryRedemptionDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent": {
     "auth_ref": [
      "r291"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer.",
        "label": "Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent",
        "terseLabel": "Membership interests of VIE subject to mandatory redemption"
       }
      }
     },
     "localname": "SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermBorrowings": {
     "auth_ref": [
      "r23",
      "r625",
      "r648"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 6.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.",
        "label": "Short-term Debt",
        "terseLabel": "Short-term debt, net of discounts",
        "verboseLabel": "Short-term debt, net of discounts"
       }
      }
     },
     "localname": "ShortTermBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermBorrowingsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Short-term Debt [Abstract]",
        "terseLabel": "Short-term debt"
       }
      }
     },
     "localname": "ShortTermBorrowingsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShortTermDebtTypeAxis": {
     "auth_ref": [
      "r53"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of short-term debt arrangement.",
        "label": "Short-term Debt, Type [Axis]",
        "terseLabel": "Short-term debt"
       }
      }
     },
     "localname": "ShortTermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShortTermDebtTypeDomain": {
     "auth_ref": [
      "r50"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.",
        "label": "Short-term Debt, Type [Domain]",
        "terseLabel": "Short-term debt"
       }
      }
     },
     "localname": "ShortTermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsGeneralDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShortTermDebtWeightedAverageInterestRate": {
     "auth_ref": [
      "r51"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of short-term debt outstanding calculated at point in time.",
        "label": "Short-term Debt, Weighted Average Interest Rate, at Point in Time",
        "terseLabel": "Weighted average interest rate - discount notes"
       }
      }
     },
     "localname": "ShortTermDebtWeightedAverageInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsShortTermDebtDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShortTermLeaseCost": {
     "auth_ref": [
      "r567",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of short-term lease cost, excluding expense for lease with term of one month or less.",
        "label": "Short-term Lease, Cost",
        "terseLabel": "Short-term Lease, Cost"
       }
      }
     },
     "localname": "ShortTermLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SignificantAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r152"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.",
        "label": "Significant Accounting Policies [Text Block]",
        "verboseLabel": "Summary of Significant Accounting Policies"
       }
      }
     },
     "localname": "SignificantAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_StatementClassOfStockAxis": {
     "auth_ref": [
      "r31",
      "r32",
      "r33",
      "r143",
      "r145",
      "r175",
      "r176",
      "r177",
      "r179",
      "r180",
      "r186",
      "r187",
      "r188",
      "r231",
      "r292",
      "r530"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by the different classes of stock of the entity.",
        "label": "Class of Stock [Axis]",
        "terseLabel": "Class of Stock [Axis]"
       }
      }
     },
     "localname": "StatementClassOfStockAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r64",
      "r153",
      "r154",
      "r155",
      "r160",
      "r169",
      "r171",
      "r185",
      "r235",
      "r292",
      "r297",
      "r428",
      "r429",
      "r430",
      "r443",
      "r444",
      "r535",
      "r536",
      "r537",
      "r538",
      "r539",
      "r541",
      "r669",
      "r670",
      "r671"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]",
        "terseLabel": "Equity Components",
        "verboseLabel": "Summary of Proprietary Capital Activity"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/ProprietaryCapitalDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Statement [Line Items]",
        "terseLabel": "Statement [Line Items]"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS",
      "http://www.tva.gov/role/RevenueCustomerTypeDetails",
      "http://www.tva.gov/role/RevenueDetails",
      "http://www.tva.gov/role/RevenueLocalPowerCompanyContractsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]",
        "terseLabel": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Financial Position [Abstract]",
        "terseLabel": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]",
        "terseLabel": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]",
        "terseLabel": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [
      "r153",
      "r154",
      "r155",
      "r185",
      "r601"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
        "label": "Statement [Table]",
        "terseLabel": "Statement [Table]"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPROPRIETARYCAPITAL",
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityNoteAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders' Equity Note [Abstract]",
        "terseLabel": "Stockholders' Equity Note [Abstract]"
       }
      }
     },
     "localname": "StockholdersEquityNoteAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityNoteDisclosureTextBlock": {
     "auth_ref": [
      "r144",
      "r297",
      "r298"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.",
        "label": "Stockholders' Equity Note Disclosure [Text Block]",
        "terseLabel": "Proprietary Capital"
       }
      }
     },
     "localname": "StockholdersEquityNoteDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/ProprietaryCapitalTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SubsequentEventTypeAxis": {
     "auth_ref": [
      "r542",
      "r585"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Axis]",
        "terseLabel": "Subsequent Event Type [Axis]"
       }
      }
     },
     "localname": "SubsequentEventTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/SubsequentEventsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTypeDomain": {
     "auth_ref": [
      "r542",
      "r585"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Domain]",
        "terseLabel": "Subsequent Event Type [Domain]"
       }
      }
     },
     "localname": "SubsequentEventTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsPutandCallOptionsDetails",
      "http://www.tva.gov/role/SubsequentEventsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SubsequentEventsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Subsequent Events [Abstract]",
        "terseLabel": "Subsequent Events [Abstract]"
       }
      }
     },
     "localname": "SubsequentEventsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventsTextBlock": {
     "auth_ref": [
      "r584",
      "r587"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.",
        "label": "Subsequent Events [Text Block]",
        "terseLabel": "Subsequent Events [Text Block]"
       }
      }
     },
     "localname": "SubsequentEventsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SubsequentEventsNotes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental Cash Flow Information [Abstract]",
        "terseLabel": "Supplemental Cash Flow Information [Abstract]"
       }
      }
     },
     "localname": "SupplementalCashFlowInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide limited group of employees with supplemental retirement benefits, in addition to other pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans.",
        "label": "Supplemental Employee Retirement Plan [Member]",
        "terseLabel": "Supplemental Employee Retirement Plans, Defined Benefit"
       }
      }
     },
     "localname": "SupplementalEmployeeRetirementPlanDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansContributionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SwapMember": {
     "auth_ref": [
      "r472"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A forward-based contract in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. The term notional is used because swap contracts generally involve no exchange of principal at either inception or maturity. Rather, the notional amount serves as a basis for calculation of the payment streams to be exchanged.",
        "label": "Swap [Member]",
        "verboseLabel": "Purchased options"
       }
      }
     },
     "localname": "SwapMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TradeAndOtherAccountsReceivablePolicy": {
     "auth_ref": [
      "r219",
      "r220",
      "r221",
      "r222",
      "r224",
      "r226"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for accounts receivable.",
        "label": "Accounts Receivable [Policy Text Block]",
        "terseLabel": "Allowance for Uncollectible Accounts"
       }
      }
     },
     "localname": "TradeAndOtherAccountsReceivablePolicy",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_TradingSecuritiesEquity": {
     "auth_ref": [],
     "calculation": {
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_InvestmentsFairValueDisclosure",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.",
        "label": "Trading Securities, Equity",
        "terseLabel": "Equity securities"
       }
      }
     },
     "localname": "TradingSecuritiesEquity",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsFairValueMeasurementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount": {
     "auth_ref": [
      "r598"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.",
        "label": "Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount",
        "terseLabel": "EnergyRight receivables",
        "verboseLabel": "EnergyRight receivables (including current portion)"
       }
      }
     },
     "localname": "TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/OtherLongTermAssetsOtherLongTermAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount": {
     "auth_ref": [
      "r599"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.",
        "label": "Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount",
        "terseLabel": "EnergyRight financing obligation",
        "verboseLabel": "EnergyRight\u00ae financing obligations (including current portion)"
       }
      }
     },
     "localname": "TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails",
      "http://www.tva.gov/role/OtherLongTermLiabilitiesOtherLongTermLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_USTreasuryAndGovernmentMember": {
     "auth_ref": [
      "r352",
      "r639",
      "r679"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This category includes investments in debt securities issued by the United States Department of the Treasury, US Government Agencies and US Government-sponsored Enterprises. Such securities may include treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years), debt securities issued by the Government National Mortgage Association (Ginnie Mae) and debt securities issued by the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac).",
        "label": "US Treasury and Government [Member]",
        "terseLabel": "Debt securities issued by U.S. Treasury and other U.S. government agencies"
       }
      }
     },
     "localname": "USTreasuryAndGovernmentMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/BenefitPlansFairValueMeasurementsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnrealizedGainLossOnDerivatives": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.",
        "label": "Unrealized Gain (Loss) on Derivatives",
        "terseLabel": "Unrealized gains/losses on derivatives"
       }
      }
     },
     "localname": "UnrealizedGainLossOnDerivatives",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/RiskManagementActivitiesandDerivativeTransactionsRiskManagementActivitiesandDerivativeTransactionsDerivativeInstrumentsThatDoNotReceiveHedgeAccountingTreatmentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UnrealizedGainLossOnInvestments": {
     "auth_ref": [
      "r130"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unrealized gain (loss) on investment.",
        "label": "Unrealized Gain (Loss) on Investments",
        "terseLabel": "Unrealized gains (losses) on investments"
       }
      }
     },
     "localname": "UnrealizedGainLossOnInvestments",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of unrealized gains and losses on investments.",
        "label": "Unrealized Gain (Loss) on Investments [Table Text Block]",
        "verboseLabel": "Unrealized Investment Gains (Losses)"
       }
      }
     },
     "localname": "UnrealizedGainLossOnInvestmentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_UnsecuredDebt": {
     "auth_ref": [
      "r27",
      "r627",
      "r649"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).",
        "label": "Unsecured Debt",
        "terseLabel": "Long-term outstanding power bonds (including current maturities), net"
       }
      }
     },
     "localname": "UnsecuredDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/FairValueMeasurementsEstimatedValuesofFinancialInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UnsecuredDebtCurrent": {
     "auth_ref": [
      "r24",
      "r625",
      "r648"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 7.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.",
        "label": "Unsecured Debt, Current",
        "terseLabel": "Total Current maturities of power bonds issued at par"
       }
      }
     },
     "localname": "UnsecuredDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtSecuritiesActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UnsecuredDebtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt obligation not collateralized by pledge of, mortgage of or other lien on the entity's assets.",
        "label": "Unsecured Debt [Member]",
        "terseLabel": "Power bonds"
       }
      }
     },
     "localname": "UnsecuredDebtMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsMaturitiesDueDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnsecuredLongTermDebt": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS": {
       "order": 1.0,
       "parentTag": "us-gaap_LongTermDebtNoncurrent",
       "weight": 1.0
      },
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.",
        "label": "Unsecured Long-term Debt, Noncurrent",
        "terseLabel": "Long-term power bonds, net",
        "totalLabel": "Long-term power bonds, net"
       }
      }
     },
     "localname": "UnsecuredLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDBALANCESHEETS",
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsDebtOutstandingDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UseOfEstimates": {
     "auth_ref": [
      "r189",
      "r190",
      "r191",
      "r192",
      "r195",
      "r196",
      "r197"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.",
        "label": "Use of Estimates, Policy [Policy Text Block]",
        "terseLabel": "Use of Estimates"
       }
      }
     },
     "localname": "UseOfEstimates",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/SummaryofSignificantAccountingPoliciesPolicyTextBlock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating expense for depreciation and amortization of regulated operation.",
        "label": "Utilities Operating Expense, Depreciation and Amortization",
        "verboseLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "UtilitiesOperatingExpenseDepreciationAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UtilitiesOperatingExpenseFuelUsed": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 4.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating expense for fuel used by regulated operation.",
        "label": "Utilities Operating Expense, Fuel Used",
        "terseLabel": "Fuel"
       }
      }
     },
     "localname": "UtilitiesOperatingExpenseFuelUsed",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UtilitiesOperatingExpensePurchasedPower": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 5.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating expense for purchased power of regulated operation.",
        "label": "Utilities Operating Expense, Purchased Power",
        "terseLabel": "Purchased power"
       }
      }
     },
     "localname": "UtilitiesOperatingExpensePurchasedPower",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UtilitiesOperatingExpenseTaxes": {
     "auth_ref": [
      "r106"
     ],
     "calculation": {
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating expense for taxes other than income taxes of regulated operation.",
        "label": "Utilities Operating Expense, Taxes",
        "terseLabel": "Tax equivalents"
       }
      }
     },
     "localname": "UtilitiesOperatingExpenseTaxes",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableInterestEntityDisclosureTextBlock": {
     "auth_ref": [
      "r471"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for a variable interest entity (VIE), including but not limited to, judgments and assumptions in determining whether to consolidate and in identifying the primary beneficiary, gain (loss) recognized on the initial consolidation of the VIE, terms of arrangements, amounts and classification of the VIE's assets and liabilities, and the entity's maximum exposure to loss.",
        "label": "Variable Interest Entity Disclosure [Text Block]",
        "terseLabel": "Variable Interest Entities"
       }
      }
     },
     "localname": "VariableInterestEntityDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_VariableInterestEntityLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Variable Interest Entity [Line Items]",
        "terseLabel": "Variable Interest Entities"
       }
      }
     },
     "localname": "VariableInterestEntityLineItems",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/DebtandOtherObligationsDebtandOtherObligationsSecuredDebtofVIEsDetails",
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VariableInterestEntityPrimaryBeneficiaryMember": {
     "auth_ref": [
      "r458",
      "r459",
      "r462",
      "r463",
      "r464"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Variable Interest Entities (VIE) in which the entity has a controlling financial interest (as defined) and of which it is therefore the primary beneficiary. A controlling financial interest is determined based on both: (a) the entity's power to direct activities of the VIE that most significantly impact the VIE's economic performance and (b) the entity's obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. VIEs of which the entity is the primary beneficiary are included in the consolidated financial statements of the entity.",
        "label": "Variable Interest Entity, Primary Beneficiary [Member]",
        "terseLabel": "Variable Interest Entity, Primary Beneficiary [Member]"
       }
      }
     },
     "localname": "VariableInterestEntityPrimaryBeneficiaryMember",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/VariableInterestEntitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VariableLeaseCost": {
     "auth_ref": [
      "r568",
      "r573"
     ],
     "calculation": {
      "http://www.tva.gov/role/LeasesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.",
        "label": "Variable Lease, Cost",
        "terseLabel": "Variable Lease, Cost"
       }
      }
     },
     "localname": "VariableLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2020-01-31",
     "presentation": [
      "http://www.tva.gov/role/LeasesDetails"
     ],
     "xbrltype": "monetaryItemType"
    }
   },
   "unitCount": 18
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(210.5-03(11))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(1))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(20))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(21))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(24))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.2(b))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.3)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.4,6)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(c),9(a))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7,9)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.9)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "220",
   "URI": "http://asc.fasb.org/topic&trid=2134417"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e7018-107765"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4273-108586"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "230",
   "URI": "http://asc.fasb.org/topic&trid=2134446"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(d))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(e)(1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(g)(1)(ii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(k))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(c))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(e),(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-04(a))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690"
  },
  "r15": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(19)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-04.(a))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-09)",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "235",
   "URI": "http://asc.fasb.org/topic&trid=2122369"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "23",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21930-107793"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21711-107793"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=115929471&loc=d3e21728-107793"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r159": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r16": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 201.5-02(24))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(4)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794"
  },
  "r17": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 201.5-02(25))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.M.Q2)",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=112272810&loc=d3e31137-122693"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=112272810&loc=SL108384541-122693"
  },
  "r174": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "250",
   "URI": "http://asc.fasb.org/topic&trid=2122394"
  },
  "r175": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1252-109256"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "55",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=d3e2626-109256"
  },
  "r178": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256"
  },
  "r18": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 201.5-02(26))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r181": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=120380238&loc=d3e3842-109258"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e543-108305"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "270",
   "URI": "http://asc.fasb.org/topic&trid=2126967"
  },
  "r185": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6828210&loc=d3e70191-108054"
  },
  "r186": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6828210&loc=d3e70229-108054"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "272",
   "URI": "http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r19": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592"
  },
  "r192": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "275",
   "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "275",
   "URI": "http://asc.fasb.org/topic&trid=2134479"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "205",
   "URI": "http://asc.fasb.org/topic&trid=2122149"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(12))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "31",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r21": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(13))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "42",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=d3e4975-111524"
  },
  "r22": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(14))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=d3e5033-111524"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=121611835&loc=d3e5093-111524"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196772"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10133-111534"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=d3e27405-111563"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=121645371&loc=SL6283291-111563"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "320",
   "URI": "http://asc.fasb.org/topic&trid=2196928"
  },
  "r23": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19)(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(1)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(2)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(3)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(4)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r240": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116847112&loc=d3e4492-108314"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116847112&loc=d3e4556-108314"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB TOPIC 5.BB)",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "330",
   "URI": "http://asc.fasb.org/topic&trid=2126998"
  },
  "r248": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "10",
   "Topic": "340",
   "URI": "http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "340",
   "URI": "http://asc.fasb.org/extlink&oid=6387103&loc=d3e6435-108320"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(2))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r252": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "350",
   "URI": "http://asc.fasb.org/topic&trid=2144416"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=27011434&loc=d3e125663-122742"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "360",
   "URI": "http://asc.fasb.org/topic&trid=2155823"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(20))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(1)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(4)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "20",
   "Topic": "410",
   "URI": "http://asc.fasb.org/subtopic&trid=2175671"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(d)(1)",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "410",
   "URI": "http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859"
  },
  "r27": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(22))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "440",
   "URI": "http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14394-108349"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14453-108349"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14472-108349"
  },
  "r28": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(23))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Subparagraph": "(SAB Topic 5.Y.Q1)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=121555522&loc=d3e12053-110248"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870"
  },
  "r29": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(24))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "480",
   "URI": "http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.3-04)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "505",
   "URI": "http://asc.fasb.org/topic&trid=2208762"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(25))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045"
  },
  "r305": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(2)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045"
  },
  "r308": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r31": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(27))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r312": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r314": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=121551570&loc=SL49130690-203046-203046"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(g)(2)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(i)(2)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(j)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048"
  },
  "r32": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(28))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "606",
   "URI": "http://asc.fasb.org/topic&trid=49130388"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "610",
   "URI": "http://asc.fasb.org/topic&trid=49130413"
  },
  "r322": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "10",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410138&loc=d3e79708-111665"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(29))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(10)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(6)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(7)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(8)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(9)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r34": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(6)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(7)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r348": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(8)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r349": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r35": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r350": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r351": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(i)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r352": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(ii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r353": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(01)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r355": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r356": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(A)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r357": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(B)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(02)(C)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(03)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r36": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(4)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r360": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r361": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r362": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r364": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r365": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r366": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r367": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r369": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(6)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r370": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(7)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(i)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r372": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(j)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r373": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(k)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r374": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(k)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r375": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(k)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r376": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(k)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r377": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(l)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r378": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(m)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r379": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(n)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(5))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r380": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(o)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r381": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(p)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r382": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(q)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r383": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(r)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r384": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(r)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r385": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(r)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r386": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r387": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920"
  },
  "r388": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920"
  },
  "r389": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r390": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920"
  },
  "r391": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920"
  },
  "r392": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r393": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r394": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r395": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r396": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r397": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r398": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(6)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r399": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(7)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r400": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r401": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920"
  },
  "r402": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
  },
  "r403": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921"
  },
  "r404": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=21916913&loc=d3e273930-122802"
  },
  "r405": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6412939&loc=d3e15145-114933"
  },
  "r406": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963"
  },
  "r407": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964"
  },
  "r408": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "60",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964"
  },
  "r409": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "70",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(c))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r410": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946"
  },
  "r411": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947"
  },
  "r412": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947"
  },
  "r413": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947"
  },
  "r414": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947"
  },
  "r415": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=d3e29149-114947"
  },
  "r416": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(d)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947"
  },
  "r417": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(f)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947"
  },
  "r418": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947"
  },
  "r419": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.1)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r420": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947"
  },
  "r421": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947"
  },
  "r422": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "80",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948"
  },
  "r423": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "715",
   "URI": "http://asc.fasb.org/topic&trid=2235017"
  },
  "r424": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r425": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r426": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r427": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r428": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r429": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.12)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r430": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r431": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(g)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r432": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(g)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333"
  },
  "r433": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "720",
   "URI": "http://asc.fasb.org/topic&trid=2122503"
  },
  "r434": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "730",
   "URI": "http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373"
  },
  "r435": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120406818&loc=d3e32247-109318"
  },
  "r436": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=120406818&loc=d3e32280-109318"
  },
  "r437": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319"
  },
  "r438": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319"
  },
  "r439": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r440": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
  },
  "r441": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "740"
  },
  "r442": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740"
  },
  "r443": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(2)",
   "Topic": "740"
  },
  "r444": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(d)(3)",
   "Topic": "740"
  },
  "r445": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(1)",
   "Topic": "740"
  },
  "r446": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(2)",
   "Topic": "740"
  },
  "r447": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Subparagraph": "(e)(3)",
   "Topic": "740"
  },
  "r448": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r449": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)(3)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r450": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r451": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
  },
  "r452": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463"
  },
  "r453": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472"
  },
  "r454": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "38",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=121598580&loc=d3e5504-128473"
  },
  "r455": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)",
   "Topic": "805",
   "URI": "http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479"
  },
  "r456": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "805",
   "URI": "http://asc.fasb.org/topic&trid=2303972"
  },
  "r457": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=d3e5291-111683"
  },
  "r458": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r459": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r460": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c),(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r461": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2AA",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "a",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=SL6759068-111685"
  },
  "r462": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685"
  },
  "r463": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685"
  },
  "r464": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685"
  },
  "r465": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685"
  },
  "r466": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5728-111685"
  },
  "r467": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685"
  },
  "r468": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685"
  },
  "r469": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=d3e5747-111685"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.14)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r470": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=121559654&loc=SL6228884-111685"
  },
  "r471": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "810",
   "URI": "http://asc.fasb.org/topic&trid=2197479"
  },
  "r472": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "83",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121636179&loc=d3e34841-113949"
  },
  "r473": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5579240-113959"
  },
  "r474": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959"
  },
  "r475": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959"
  },
  "r476": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959"
  },
  "r477": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41620-113959"
  },
  "r478": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "c",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959"
  },
  "r479": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.17)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r480": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959"
  },
  "r481": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959"
  },
  "r482": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959"
  },
  "r483": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959"
  },
  "r484": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959"
  },
  "r485": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959"
  },
  "r486": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959"
  },
  "r487": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959"
  },
  "r488": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959"
  },
  "r489": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959"
  },
  "r49": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a)(7))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r490": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r491": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r492": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r493": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r494": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(6)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r495": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959"
  },
  "r496": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624181-113959"
  },
  "r497": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4F",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(5)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624186-113959"
  },
  "r498": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959"
  },
  "r499": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r500": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41641-113959"
  },
  "r501": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959"
  },
  "r502": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959"
  },
  "r503": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "182",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121582272&loc=SL5629052-113961"
  },
  "r504": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Subparagraph": "(a)(1),(2)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986"
  },
  "r505": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986"
  },
  "r506": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993"
  },
  "r507": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=121549185&loc=d3e80845-113994"
  },
  "r508": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "815",
   "URI": "http://asc.fasb.org/topic&trid=2229140"
  },
  "r509": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r510": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r511": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r512": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r513": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r514": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r515": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r516": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r517": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
  },
  "r518": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
  },
  "r519": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b),22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r520": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r521": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=116690757&loc=d3e13220-108610"
  },
  "r522": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611"
  },
  "r523": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611"
  },
  "r524": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13476-108611"
  },
  "r525": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611"
  },
  "r526": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611"
  },
  "r527": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611"
  },
  "r528": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13572-108611"
  },
  "r529": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "23",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=121572278&loc=d3e13587-108611"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r530": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612"
  },
  "r531": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885"
  },
  "r532": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=121605123&loc=d3e30226-110892"
  },
  "r533": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894"
  },
  "r534": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895"
  },
  "r535": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900"
  },
  "r536": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r537": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r538": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r539": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19,20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r540": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r541": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901"
  },
  "r542": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901"
  },
  "r543": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r544": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r545": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399"
  },
  "r546": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399"
  },
  "r547": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399"
  },
  "r548": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=119993939&loc=d3e28567-108399"
  },
  "r549": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r550": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(Note 3)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697"
  },
  "r551": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717"
  },
  "r552": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717"
  },
  "r553": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121573735&loc=d3e41502-112717"
  },
  "r554": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121569800&loc=d3e45014-112735"
  },
  "r555": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121569800&loc=d3e45023-112735"
  },
  "r556": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121569800&loc=d3e45031-112735"
  },
  "r557": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121616839&loc=d3e45280-112737"
  },
  "r558": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=121616839&loc=d3e45280-112737"
  },
  "r559": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "840",
   "URI": "http://asc.fasb.org/topic&trid=2208923"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r560": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977"
  },
  "r561": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977"
  },
  "r562": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977"
  },
  "r563": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918666-209980"
  },
  "r564": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980"
  },
  "r565": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r566": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r567": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r568": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r569": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(3)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.20,24)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r570": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(4)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r571": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980"
  },
  "r572": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980"
  },
  "r573": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "53",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971"
  },
  "r574": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r575": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r576": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r577": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r578": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r579": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.21)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r580": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864"
  },
  "r581": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "850",
   "URI": "http://asc.fasb.org/topic&trid=2122745"
  },
  "r582": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "852",
   "URI": "http://asc.fasb.org/extlink&oid=120604989&loc=SL2890621-112765"
  },
  "r583": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "852",
   "URI": "http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766"
  },
  "r584": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "855",
   "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
  },
  "r585": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "855",
   "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
  },
  "r586": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "855",
   "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662"
  },
  "r587": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "855",
   "URI": "http://asc.fasb.org/topic&trid=2122774"
  },
  "r588": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r589": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r590": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r591": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r592": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r593": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719"
  },
  "r594": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r595": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r596": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719"
  },
  "r597": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719"
  },
  "r598": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729"
  },
  "r599": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)(ii)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(2))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r600": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "910",
   "URI": "http://asc.fasb.org/extlink&oid=119991564&loc=SL119991595-234733"
  },
  "r601": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 11.L)",
   "Topic": "924",
   "URI": "http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856"
  },
  "r602": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r603": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r604": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r605": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(f)(1)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r606": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(f)(2)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r607": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "20",
   "Subparagraph": "(f)(3)",
   "Topic": "926",
   "URI": "http://asc.fasb.org/extlink&oid=120154821&loc=SL120154904-197079"
  },
  "r608": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
  },
  "r609": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r610": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
  },
  "r611": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
  },
  "r612": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
  },
  "r613": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
  },
  "r614": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
  },
  "r615": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
  },
  "r616": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
  },
  "r617": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
  },
  "r618": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447"
  },
  "r619": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(1)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.24)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r620": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(2)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
  },
  "r621": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "310",
   "Topic": "940",
   "URI": "http://asc.fasb.org/subtopic&trid=2176284"
  },
  "r622": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "320",
   "Topic": "940",
   "URI": "http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969"
  },
  "r623": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(1)(a))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r624": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r625": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r626": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(15))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r627": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(16))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r628": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(17))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r629": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.13,16)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.25)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r630": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15(1),(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r631": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r632": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r633": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.17)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878"
  },
  "r634": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r635": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r636": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(26))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r637": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.9)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260"
  },
  "r638": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.9-05(b)(2))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884"
  },
  "r639": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=120252992&loc=d3e62557-112803"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r640": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r641": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Subparagraph": "(e)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r642": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Subparagraph": "e",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r643": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r644": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r645": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(1)(b))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r646": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r647": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(15))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r648": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16)(a)(1))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r649": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.3(c))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r650": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r651": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(3))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r652": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r653": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.(a),19)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r654": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.15(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r655": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.15)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r656": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.16)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910"
  },
  "r657": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(18))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r658": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r659": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(22))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.3,4)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r660": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(3)(b))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r661": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.4)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r662": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.7)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263"
  },
  "r663": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(d)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121643868&loc=SL117782755-158439"
  },
  "r664": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117783719-158441"
  },
  "r665": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(c)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117783719-158441"
  },
  "r666": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29F",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121639165&loc=SL117819544-158441"
  },
  "r667": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r668": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r669": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(a)(4),(5))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r670": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r671": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(f)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r672": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r673": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(i)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r674": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(ii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r675": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iii)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r676": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(2)(iv)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r677": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r678": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(h)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641"
  },
  "r679": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=121641442&loc=d3e19393-158473"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r680": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "210",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840"
  },
  "r681": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "210",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840"
  },
  "r682": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r683": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r684": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column B)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r685": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r686": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r687": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r688": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r689": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 6))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r690": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12B(Column D)(Footnote 7))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010"
  },
  "r691": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column B)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010"
  },
  "r692": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5D",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13D(Column C)(Footnote 2))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=SL120429264-123010"
  },
  "r693": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r694": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column B))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r695": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column C))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r696": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column D))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=120401592&loc=d3e611379-123010"
  },
  "r697": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "310",
   "Subparagraph": "(SX 210.12-29(Footnote 4))",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014"
  },
  "r698": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "740",
   "Topic": "954",
   "URI": "http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650"
  },
  "r699": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Subparagraph": "(d)",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r700": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916"
  },
  "r701": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "360",
   "Topic": "958",
   "URI": "http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916"
  },
  "r702": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column B))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r703": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column C))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r704": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column D))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r705": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column E))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r706": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column F))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r707": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column G))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r708": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column H))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r709": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Column I))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.8)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r710": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 2))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r711": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 4))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024"
  },
  "r712": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "10",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=79984601&loc=d3e39995-110364"
  },
  "r713": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 10.D)",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6499423&loc=d3e659339-123030"
  },
  "r714": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "340",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=121557228&loc=d3e43603-110378"
  },
  "r715": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "340",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382"
  },
  "r716": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "340",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382"
  },
  "r717": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "360",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6500292&loc=d3e45555-110387"
  },
  "r718": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "360",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6500292&loc=d3e45573-110387"
  },
  "r719": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "360",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6500292&loc=d3e45591-110387"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.9)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682"
  },
  "r720": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SAB Topic 10.C)",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033"
  },
  "r721": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "405",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394"
  },
  "r722": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "410",
   "Subparagraph": "(SAB Topic 10.F)",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6228715&loc=d3e660557-123036"
  },
  "r723": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "715",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419"
  },
  "r724": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "740",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6501382&loc=d3e54053-110423"
  },
  "r725": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "740",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=6501382&loc=d3e54136-110423"
  },
  "r726": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "840",
   "Topic": "980",
   "URI": "http://asc.fasb.org/extlink&oid=121602270&loc=d3e56759-110438"
  },
  "r727": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756"
  },
  "r728": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756"
  },
  "r729": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "985",
   "URI": "http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r730": {
   "Name": "Form 10-K",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "310"
  },
  "r731": {
   "Name": "Form 20-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "220",
   "Subsection": "f"
  },
  "r732": {
   "Name": "Form 20-F",
   "Publisher": "SEC",
   "Section": "Item 18",
   "Subsection": "Instruction 2"
  },
  "r733": {
   "Name": "Form 40-F",
   "Number": "249",
   "Publisher": "SEC",
   "Section": "240",
   "Subsection": "f"
  },
  "r734": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1"
  },
  "r735": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r736": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r737": {
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "11",
   "Subsection": "03"
  },
  "r738": {
   "Footnote": "2",
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "28"
  },
  "r739": {
   "Footnote": "4",
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "28"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r740": {
   "Footnote": "4",
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "29"
  },
  "r741": {
   "Name": "Rule 15c3-1",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "15c3-1"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(2)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r79": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6787-107765"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313"
  },
  "r82": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=121566466&loc=d3e6801-107765"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL34724394-108580"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=121641772&loc=d3e557-108580"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116657188&loc=SL116659661-227067"
  }
 },
 "version": "2.1"
}
