{
 "instance": {
  "fhlb-atlq22019.htm": {
   "axisCustom": 4,
   "axisStandard": 23,
   "contextCount": 306,
   "dts": {
    "calculationLink": {
     "local": [
      "fhlba-20190630_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "fhlba-20190630_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
      "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "fhlb-atlq22019.htm"
     ]
    },
    "labelLink": {
     "local": [
      "fhlba-20190630_lab.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml",
      "http://xbrl.sec.gov/invest/2013/invest-doc-2013-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "fhlba-20190630_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "http://xbrl.sec.gov/invest/2013/invest-ref-2013-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "fhlba-20190630.xsd"
     ],
     "remote": [
      "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.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/2019/elts/srt-2019-01-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
      "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd",
      "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
      "https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd",
      "http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd",
      "http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd",
      "http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd",
      "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.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/2019/elts/us-parts-codification-2019-01-31.xsd"
     ]
    }
   },
   "elementCount": 630,
   "entityCount": 1,
   "hidden": {
    "http://fasb.org/us-gaap/2019-01-31": 15,
    "http://www.fhlbatl.com/20190630": 8,
    "http://xbrl.sec.gov/dei/2019-01-31": 6,
    "total": 29
   },
   "keyCustom": 79,
   "keyStandard": 383,
   "memberCustom": 20,
   "memberStandard": 45,
   "nsprefix": "fhlba",
   "nsuri": "http://www.fhlbatl.com/20190630",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:EntityRegistrantName",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "0001000 - Document - Document and Entity Information",
     "role": "http://www.fhlbatl.com/role/DocumentAndEntityInformation",
     "shortName": "Document and Entity Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "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": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:TradingSecuritiesAndCertainTradingAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2102100 - Disclosure - Trading Securities",
     "role": "http://www.fhlbatl.com/role/TradingSecurities",
     "shortName": "Trading Securities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:TradingSecuritiesAndCertainTradingAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:AvailableForSaleSecuritiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2103100 - Disclosure - Available-for-sale Securities",
     "role": "http://www.fhlbatl.com/role/AvailableForSaleSecurities",
     "shortName": "Available-for-sale Securities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:AvailableForSaleSecuritiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:HeldToMaturitySecuritiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2105100 - Disclosure - Held-to-maturity Securities",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecurities",
     "shortName": "Held-to-maturity Securities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:HeldToMaturitySecuritiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2106100 - Disclosure - Other-than-temporary Impairment",
     "role": "http://www.fhlbatl.com/role/OtherThanTemporaryImpairment",
     "shortName": "Other-than-temporary Impairment",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2107100 - Disclosure - Advances",
     "role": "http://www.fhlbatl.com/role/Advances",
     "shortName": "Advances",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FinancingReceivablesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2108100 - Disclosure - Mortgage Loans Held for Portfolio",
     "role": "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolio",
     "shortName": "Mortgage Loans Held for Portfolio",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FinancingReceivablesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2110100 - Disclosure - Allowance for Credit Losses",
     "role": "http://www.fhlbatl.com/role/AllowanceForCreditLosses",
     "shortName": "Allowance for Credit Losses",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2113100 - Disclosure - Consolidated Obligations",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligations",
     "shortName": "Consolidated Obligations",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2115100 - Disclosure - Capital and Mandatorily Redeemable Capital Stock",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStock",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2116100 - Disclosure - Accumulated Other Comprehensive Income",
     "role": "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncome",
     "shortName": "Accumulated Other Comprehensive Income",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ComprehensiveIncomeNoteTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndDueFromBanks",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1001000 - Statement - Statements of Condition (Unaudited)",
     "role": "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
     "shortName": "Statements of Condition (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:InterestBearingDepositsInBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2118100 - Disclosure - Derivatives and Hedging Activities",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivities",
     "shortName": "Derivatives and Hedging Activities",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2119100 - Disclosure - Estimated Fair Values",
     "role": "http://www.fhlbatl.com/role/EstimatedFairValues",
     "shortName": "Estimated Fair Values",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2120100 - Disclosure - Commitments and Contingencies",
     "role": "http://www.fhlbatl.com/role/CommitmentsAndContingencies",
     "shortName": "Commitments and Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:TransactionsWithShareholdersTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2121100 - Disclosure - Transactions With Shareholders",
     "role": "http://www.fhlbatl.com/role/TransactionsWithShareholders",
     "shortName": "Transactions With Shareholders",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:TransactionsWithShareholdersTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SubsequentEventsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2122100 - Disclosure - Subsequent Events",
     "role": "http://www.fhlbatl.com/role/SubsequentEvents",
     "shortName": "Subsequent Events",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SubsequentEventsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2201201 - Disclosure - Basis of Presentation (Policies)",
     "role": "http://www.fhlbatl.com/role/BasisOfPresentationPolicies",
     "shortName": "Basis of Presentation (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GainLossOnInvestmentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2302301 - Disclosure - Trading Securities (Tables)",
     "role": "http://www.fhlbatl.com/role/TradingSecuritiesTables",
     "shortName": "Trading Securities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GainLossOnInvestmentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2303301 - Disclosure - Available-for-sale Securities (Tables)",
     "role": "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables",
     "shortName": "Available-for-sale Securities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD_us-gaap_InformationByCategoryOfDebtSecurityAxis_us-gaap_HeldtomaturitySecuritiesMember",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:HeldToMaturitySecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2305301 - Disclosure - Held-to-maturity Securities (Tables)",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables",
     "shortName": "Held-to-maturity Securities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD_us-gaap_InformationByCategoryOfDebtSecurityAxis_us-gaap_HeldtomaturitySecuritiesMember",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:HeldToMaturitySecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearningsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2306301 - Disclosure - Other-than-Temporary Impairment (Tables)",
     "role": "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentTables",
     "shortName": "Other-than-Temporary Impairment (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearningsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:HeldToMaturitySecuritiesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesFairValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1001501 - Statement - Statements of Condition (Unaudited) (Parenthetical)",
     "role": "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical",
     "shortName": "Statements of Condition (Unaudited) (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": null
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2307301 - Disclosure - Advances (Tables)",
     "role": "http://www.fhlbatl.com/role/AdvancesTables",
     "shortName": "Advances (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfParticipatingMortgageLoansTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2308301 - Disclosure - Mortgage Loans Held for Portfolio (Tables)",
     "role": "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioTables",
     "shortName": "Mortgage Loans Held for Portfolio (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfParticipatingMortgageLoansTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2310301 - Disclosure - Allowance for Credit Losses (Tables)",
     "role": "http://www.fhlbatl.com/role/AllowanceForCreditLossesTables",
     "shortName": "Allowance for Credit Losses (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleOfConsolidatedObligationBondsByInterestRatePaymentTermsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2313301 - Disclosure - Consolidated Obligations (Tables)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsTables",
     "shortName": "Consolidated Obligations (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleOfConsolidatedObligationBondsByInterestRatePaymentTermsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2315301 - Disclosure - Capital and Mandatorily Redeemable Capital Stock (Tables)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockTables",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2316301 - Disclosure - Accumulated Other Comprehensive Income (Tables)",
     "role": "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeTables",
     "shortName": "Accumulated Other Comprehensive Income (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2318301 - Disclosure - Derivatives and Hedging Activities (Tables)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables",
     "shortName": "Derivatives and Hedging Activities (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2319301 - Disclosure - Estimated Fair Values (Tables)",
     "role": "http://www.fhlbatl.com/role/EstimatedFairValuesTables",
     "shortName": "Estimated Fair Values (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherCommitmentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2320301 - Disclosure - Commitments and Contingencies (Tables)",
     "role": "http://www.fhlbatl.com/role/CommitmentsAndContingenciesTables",
     "shortName": "Commitments and Contingencies (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherCommitmentsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleofTransactionswith10PercentShareholdersTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2321301 - Disclosure - Transactions With Shareholders (Tables)",
     "role": "http://www.fhlbatl.com/role/TransactionsWithShareholdersTables",
     "shortName": "Transactions With Shareholders (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "fhlba:ScheduleofTransactionswith10PercentShareholdersTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestIncomeFederalHomeLoanBankAdvances",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1002000 - Statement - Statements of Income (Unaudited)",
     "role": "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited",
     "shortName": "Statements of Income (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:InterestIncomeDepositsWithFinancialInstitutions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:TradingSecuritiesDebt",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2402402 - Disclosure - Trading Securities (Trading Securities by Major Security Type) (Details)",
     "role": "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails",
     "shortName": "Trading Securities (Trading Securities by Major Security Type) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:GainLossOnInvestmentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:TradingSecuritiesUnrealizedHoldingGainLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2402403 - Disclosure - Trading Securities (Net Losses on Trading Securities) (Details)",
     "role": "http://www.fhlbatl.com/role/TradingSecuritiesNetLossesOnTradingSecuritiesDetails",
     "shortName": "Trading Securities (Net Losses on Trading Securities) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:GainLossOnInvestmentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:TradingSecuritiesUnrealizedHoldingGainLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2403402 - Disclosure - Available-for-sale Securities (Available-for-sale by Major Security Type) (Details)",
     "role": "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
     "shortName": "Available-for-sale Securities (Available-for-sale by Major Security Type) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "fhlba:AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "positions",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2403403 - Disclosure - Available-for-sale Securities (Summary of Available-for-sale Securities in a Continuous Unrealized Loss Position) (Details)",
     "role": "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
     "shortName": "Available-for-sale Securities (Summary of Available-for-sale Securities in a Continuous Unrealized Loss Position) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "fhlba:AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "positions",
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2403404 - Disclosure - Available-for-sale Securities (Summary of Available-for-sale MBS issued by Members or Affiliates of Members) (Details)",
     "role": "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
     "shortName": "Available-for-sale Securities (Summary of Available-for-sale MBS issued by Members or Affiliates of Members) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "fhlba:ScheduleOfAvailableForSaleSecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_fhlba_MBSIssuedByMembersOrAffiliatesOfMembersMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405402 - Disclosure - Held-to-maturity Securities (Held-to-maturity by Major Security Type) (Details)",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
     "shortName": "Held-to-maturity Securities (Held-to-maturity by Major Security Type) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:HeldToMaturitySecuritiesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_us-gaap_USStatesAndPoliticalSubdivisionsMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "fhlba:HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "positions",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405403 - Disclosure - Held-to-maturity Securities (Summary of Held-to-maturity Securities in a Continuous Unrealized Loss Position) (Details)",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
     "shortName": "Held-to-maturity Securities (Summary of Held-to-maturity Securities in a Continuous Unrealized Loss Position) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "fhlba:HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "positions",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405404 - Disclosure - Held-to-maturity Securities (Redemption Terms) (Details)",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
     "shortName": "Held-to-maturity Securities (Redemption Terms) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_fhlba_OtherThanMortgageBackedSecuritiesMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405405 - Disclosure - Held-to-maturity Securities (Summary of Held-to-Maturity MBS issued by Members or Affliates of Members (Details)",
     "role": "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
     "shortName": "Held-to-maturity Securities (Summary of Held-to-Maturity MBS issued by Members or Affliates of Members (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfHeldToMaturitySecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancialInstrumentAxis_fhlba_MBSIssuedByMembersOrAffiliatesOfMembersMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2406404 - Disclosure - Other-than-temporary Impairment (Roll-forward of Credit Losses) (Details)",
     "role": "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentRollForwardOfCreditLossesDetails",
     "shortName": "Other-than-temporary Impairment (Roll-forward of Credit Losses) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1003000 - Statement - Statements of Comprehensive Income (Unaudited)",
     "role": "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited",
     "shortName": "Statements of Comprehensive Income (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "lang": null,
      "name": "fhlba:OtherComprehensiveIncomeLossOtherThanTemporaryImpairmentLossesAvailableForSaleSecuritiesAdjustment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DepositLiabilitiesReclassifiedAsLoansReceivable1",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2407402 - Disclosure - Advances Advances (Redemption Terms) (Details)",
     "role": "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails",
     "shortName": "Advances Advances (Redemption Terms) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesMaturitiesSummaryInNextRollingTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DepositLiabilitiesReclassifiedAsLoansReceivable1",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2407403 - Disclosure - Advances (Advances by Year of Contractual Maturity for Convertible Advances) (Details)",
     "role": "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails",
     "shortName": "Advances (Advances by Year of Contractual Maturity for Convertible Advances) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInNextRollingTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesFixedRateUnderOneYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2407404 - Disclosure - Advances (Interest-rate Payment Terms) (Details)",
     "role": "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails",
     "shortName": "Advances (Interest-rate Payment Terms) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FederalHomeLoanBankAdvancesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankAdvancesFixedRateUnderOneYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "fhlba:NumberofTopAdvancesBorrowers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Institutions",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2407405 - Disclosure - Advances (Credit Risk Narrative) (Details Textual)",
     "role": "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual",
     "shortName": "Advances (Credit Risk Narrative) (Details Textual)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "fhlba:NumberofTopAdvancesBorrowers",
      "reportCount": 1,
      "unique": true,
      "unitRef": "Institutions",
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfParticipatingMortgageLoansTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "fhlba:LoansAndLeasesReceivableUnpaidPrincipalBalance",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2408402 - Disclosure - Mortgage Loans Held for Portfolio (Details)",
     "role": "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails",
     "shortName": "Mortgage Loans Held for Portfolio (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfParticipatingMortgageLoansTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "fhlba:LoansAndLeasesReceivableUnpaidPrincipalBalance",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_us-gaap_ConventionalLoanMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:LoansAndLeasesReceivableAllowance",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2410402 - Disclosure - Allowance for Credit Losses (Roll-forward of Allowance for Credit Losses) (Details)",
     "role": "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails",
     "shortName": "Allowance for Credit Losses (Roll-forward of Allowance for Credit Losses) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_us-gaap_ConventionalLoanMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:ProvisionForLoanLossesExpensed",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:PastDueFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:NotesReceivableGross",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2410403 - Disclosure - Allowance for Credit Losses (Mortgage Loan Portfolio by Impairment Methodology) (Details)",
     "role": "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
     "shortName": "Allowance for Credit Losses (Mortgage Loan Portfolio by Impairment Methodology) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_us-gaap_ConventionalLoanMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:PastDueFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableRecordedInvestmentPastDue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2410404 - Disclosure - Allowance for Credit Losses (Credit Quality Indicators) (Details)",
     "role": "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
     "shortName": "Allowance for Credit Losses (Credit Quality Indicators) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:PastDueFinancingReceivablesTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FinancingReceivablePortfolioSegmentAxis_us-gaap_ResidentialPortfolioSegmentMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancingReceivableRecordedInvestmentPastDue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "fhlba:NumberOfFederalHomeLoanBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "bank",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413402 - Disclosure - Consolidated Obligations (Narrative) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsNarrativeDetails",
     "shortName": "Consolidated Obligations (Narrative) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "fhlba:NumberOfFederalHomeLoanBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "bank",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfMaturitiesOfConsolidatedObligationBondsByContractualOrNextCallDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413403 - Disclosure - Consolidated Obligations (Interest-rate Payment Terms) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
     "shortName": "Consolidated Obligations (Interest-rate Payment Terms) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfConsolidatedObligationBondsByInterestRatePaymentTermsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_fhlba_DebtInstrumentInterestRatePaymentTermsNameAxis_fhlba_FixedInterestRateMember_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2017Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:SharesIssued",
      "reportCount": 1,
      "unitRef": "shares",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1004000 - Statement - Statements of Stockholders' Equity (Unaudited)",
     "role": "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited",
     "shortName": "Statements of Stockholders' Equity (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2018Q2YTD_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:StockIssuedDuringPeriodSharesNewIssues",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankConsolidatedObligationsBonds",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413404 - Disclosure - Consolidated Obligations (Redemption Terms) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails",
     "shortName": "Consolidated Obligations (Redemption Terms) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DebtInstrumentUnamortizedPremium",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfMaturitiesOfConsolidatedObligationBondsByContractualOrNextCallDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413405 - Disclosure - Consolidated Obligations (Bonds by Callable Feature) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
     "shortName": "Consolidated Obligations (Bonds by Callable Feature) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfConsolidatedObligationBondsByCallFeatureTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_fhlba_DebtInstrumentCallFeatureAxis_fhlba_FederalHomeLoanBankConsolidatedObligationsWithNoRelatedOptionMember_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DebtInstrumentFaceAmount",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413406 - Disclosure - Consolidated Obligations (Bonds by Maturity or Call Date) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
     "shortName": "Consolidated Obligations (Bonds by Maturity or Call Date) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfMaturitiesOfConsolidatedObligationBondsByContractualOrNextCallDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_fhlba_LongTermDebtByMaturityTypeAxis_fhlba_EarlierOfContractualMaturityOrNextCallDateMember_us-gaap_DebtInstrumentAxis_fhlba_ConsolidatedObligationBondsMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankConsolidatedObligationsDiscountNotes",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413407 - Disclosure - Consolidated Obligations (Discount Notes) (Details)",
     "role": "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
     "shortName": "Consolidated Obligations (Discount Notes) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfShortTermDebtTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_ShortTermDebtTypeAxis_us-gaap_ShortTermDebtMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankConsolidatedObligationsDiscountNotes",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfMandatorilyRedeemableCapitalStockTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415402 - Disclosure - Capital and Mandatorily Redeemable Capital Stock (Narrative) (Details)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockNarrativeDetails",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock (Narrative) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankRiskBasedCapitalRequired",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415403 - Disclosure - Capital and Mandatorily Redeemable Capital Stock (Regulatory Capital Rules and Requirements) (Details)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock (Regulatory Capital Rules and Requirements) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FederalHomeLoanBankRiskBasedCapitalRequired",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleofdeclaredquarterlycashdividendsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DividendsCommonStockCash",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415404 - Disclosure - Capital and Mandatorily Redeemable Capital Stock Schedule of Declared and Paid Quarterly Dividends (Details)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockScheduleOfDeclaredAndPaidQuarterlyDividendsDetails",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock Schedule of Declared and Paid Quarterly Dividends (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleofdeclaredquarterlycashdividendsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "4",
      "lang": null,
      "name": "fhlba:CommonStockDividendAnnualizedRate",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "fhlba:ScheduleOfMandatorilyRedeemableCapitalStockTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415405 - Disclosure - Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock Roll-forward) (Details)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockRollForwardDetails",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock Roll-forward) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "fhlba:ScheduleOfMandatorilyRedeemableCapitalStockByMaturityDateTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFour",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415406 - Disclosure - Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock by Year of Redemption) (Details)",
     "role": "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockByYearOfRedemptionDetails",
     "shortName": "Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock by Year of Redemption) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "fhlba:ScheduleOfMandatorilyRedeemableCapitalStockByMaturityDateTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFour",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2018Q4",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossBeforeFederalHomeLoanBankAssessments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2416402 - Disclosure - Accumulated Other Comprehensive Income (Details)",
     "role": "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
     "shortName": "Accumulated Other Comprehensive Income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1_us-gaap_StatementEquityComponentsAxis_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossBeforeFederalHomeLoanBankAssessments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1005000 - Statement - Statements of Cash Flows (Unaudited)",
     "role": "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited",
     "shortName": "Statements of Cash Flows (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DepreciationAmortizationAndAccretionNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "link:footnote",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "fhlba:VariationMarginforDailySettledContractsNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418402 - Disclosure - Derivatives and Hedging Activities (Fair Value of Derivative Instruments) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
     "shortName": "Derivatives and Hedging Activities (Fair Value of Derivative Instruments) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "link:footnote",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": "en-US",
      "name": "fhlba:VariationMarginforDailySettledContractsNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestIncomeFederalHomeLoanBankAdvances",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418403 - Disclosure - Derivatives and Hedging Activities (Net Gains (Losses) on Fair Value Hedging Relationships) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
     "shortName": "Derivatives and Hedging Activities (Net Gains (Losses) on Fair Value Hedging Relationships) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD_us-gaap_DerivativeInstrumentRiskAxis_us-gaap_InterestRateContractMember_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_fhlba_AdvancesMember_us-gaap_IncomeStatementLocationAxis_us-gaap_InterestIncomeMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:InterestIncomeFederalHomeLoanBankAdvances",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_fhlba_AdvancesMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HedgedAssetFairValueHedge",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418404 - Disclosure - Derivatives and Hedging Activities (Cumulative Basis Adjustments for Fair Value Hedges) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
     "shortName": "Derivatives and Hedging Activities (Cumulative Basis Adjustments for Fair Value Hedges) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_fhlba_AdvancesMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:HedgedAssetFairValueHedge",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418405 - Disclosure - Derivatives and Hedging Activities (Net Gains (Losses) on Derivatives and Hedging Activities Recorded in Non-interest Income) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
     "shortName": "Derivatives and Hedging Activities (Net Gains (Losses) on Derivatives and Hedging Activities Recorded in Non-interest Income) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2QTD",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:OffsettingAssetsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeFairValueOfDerivativeAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418406 - Disclosure - Derivatives and Hedging Activities (Offsetting of Derivative Assets and Derivative Liabilities) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
     "shortName": "Derivatives and Hedging Activities (Offsetting of Derivative Assets and Derivative Liabilities) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:OffsettingAssetsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeFairValueOfDerivativeAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentPeriodEndDate",
      "reportCount": 1,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418407 - Disclosure - Derivatives and Hedging Activities (Narrative) (Details)",
     "role": "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
     "shortName": "Derivatives and Hedging Activities (Narrative) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DerivativeNetLiabilityPositionAggregateFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:TradingSecuritiesDebt",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2419402 - Disclosure - Estimated Fair Values (Estimated Fair Value Measurements on a Recurring Basis) (Details)",
     "role": "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
     "shortName": "Estimated Fair Values (Estimated Fair Value Measurements on a Recurring Basis) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:DerivativeCollateralRightToReclaimCash",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R77": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1_us-gaap_FairValueByAssetClassAxis_fhlba_AvailableforSaleSecuritiesPrivateLabelResidentialMortgageBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2419403 - Disclosure - Estimated Fair Values (Roll-forward of Level 3 Assets and Liabilities) (Details)",
     "role": "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails",
     "shortName": "Estimated Fair Values (Roll-forward of Level 3 Assets and Liabilities) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "us-gaap:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q1_us-gaap_FairValueByAssetClassAxis_fhlba_AvailableforSaleSecuritiesPrivateLabelResidentialMortgageBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R78": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndDueFromBanks",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2419404 - Disclosure - Estimated Fair Values (Fair Value Summary) (Details)",
     "role": "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
     "shortName": "Estimated Fair Values (Fair Value Summary) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "div",
       "ix:continuation",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:CashAndDueFromBanks",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R79": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "link:footnote",
       "td",
       "tr",
       "table",
       "us-gaap:OtherCommitmentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_LossContingenciesByNatureOfContingencyAxis_us-gaap_StandbyLettersOfCreditMember",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "fhlba:NumberOfOutstandingStandbyLettersOfCreditRenewableAnnually",
      "reportCount": 1,
      "unique": true,
      "unitRef": "letter_of_credit",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2420402 - Disclosure - Commitments and Contingencies (Details)",
     "role": "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
     "shortName": "Commitments and Contingencies (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "link:footnote",
       "td",
       "tr",
       "table",
       "us-gaap:OtherCommitmentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2_us-gaap_LossContingenciesByNatureOfContingencyAxis_us-gaap_StandbyLettersOfCreditMember",
      "decimals": "0",
      "first": true,
      "lang": "en-US",
      "name": "fhlba:NumberOfOutstandingStandbyLettersOfCreditRenewableAnnually",
      "reportCount": 1,
      "unique": true,
      "unitRef": "letter_of_credit",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2101100 - Disclosure - Basis of Presentation",
     "role": "http://www.fhlbatl.com/role/BasisOfPresentation",
     "shortName": "Basis of Presentation",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R80": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "fhlba:ConsolidatedObligationJointlyAndSeverallyLiable",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2420403 - Disclosure - Commitments and Contingencies (Narrative) (Details)",
     "role": "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails",
     "shortName": "Commitments and Contingencies (Narrative) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "fhlba:ConsolidatedObligationJointlyAndSeverallyLiable",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R81": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "fhlba:RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2421402 - Disclosure - Transactions With Shareholders (Details)",
     "role": "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails",
     "shortName": "Transactions With Shareholders (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FI2019Q2",
      "decimals": "2",
      "first": true,
      "lang": null,
      "name": "fhlba:RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R82": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "D2019Q3SharesOutstanding",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:PaymentsOfDividends",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2422401 - Disclosure - Subsequent (Details)",
     "role": "http://www.fhlbatl.com/role/SubsequentDetails",
     "shortName": "Subsequent (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "D2019Q3SharesOutstanding",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:PaymentsOfDividends",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2101100 - Disclosure - Recently Issued and Adopted Accounting Guidance",
     "role": "http://www.fhlbatl.com/role/RecentlyIssuedAndAdoptedAccountingGuidance",
     "shortName": "Recently Issued and Adopted Accounting Guidance",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
       "body",
       "html"
      ],
      "baseRef": "fhlb-atlq22019.htm",
      "contextRef": "FD2019Q2YTD",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 70,
   "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in CCYY 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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "gYearItemType"
    },
    "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 CCYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentQuarterlyReport": {
     "auth_ref": [
      "r321"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an quarterly report.",
        "label": "Document Quarterly Report",
        "terseLabel": "Document Quarterly Report"
       }
      }
     },
     "localname": "DocumentQuarterlyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r322"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r324"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r323"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_NoTradingSymbolFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a security having no trading symbol.",
        "label": "No Trading Symbol Flag",
        "terseLabel": "No Trading Symbol Flag"
       }
      }
     },
     "localname": "NoTradingSymbolFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "fhlba_AccruedInterestPayableFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of the 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.",
        "label": "Accrued Interest Payable, Fair Value Disclosure",
        "terseLabel": "Accrued Interest Payable, Fair Value Disclosure"
       }
      }
     },
     "localname": "AccruedInterestPayableFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_AccruedInterestReceivableFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of the carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.",
        "label": "Accrued Interest Receivable, Fair Value Disclosure",
        "terseLabel": "Accrued Interest Receivable, Fair Value Disclosure"
       }
      }
     },
     "localname": "AccruedInterestReceivableFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_AccruedInterestonMortgageLoans": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accrued Interest on Mortgage Loans",
        "label": "Accrued Interest on Mortgage Loans",
        "terseLabel": "Accrued Interest on Mortgage Loans"
       }
      }
     },
     "localname": "AccruedInterestonMortgageLoans",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_AdvancesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Advances.",
        "label": "Advances [Abstract]"
       }
      }
     },
     "localname": "AdvancesAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "xbrltype": "stringItemType"
    },
    "fhlba_AdvancesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents Federal Home Loan Bank loans (Advances).",
        "label": "Advances [Member]",
        "terseLabel": "Advances [Member]"
       }
      }
     },
     "localname": "AdvancesMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_AltAMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities classified as Alt-A that used alternative procedures in underwriting.  Typically classified between Prime and Subprime in credit quality characteristics.",
        "label": "Alt- A [Member]",
        "terseLabel": "Alt- A [Member]"
       }
      }
     },
     "localname": "AltAMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_AmortizationAccretionofActiveHedgingRelationships": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortization/Accretion of Active Hedging Relationships",
        "label": "Amortization Accretion of Active Hedging Relationships",
        "terseLabel": "Amortization Accretion of Active Hedging Relationships"
       }
      }
     },
     "localname": "AmortizationAccretionofActiveHedgingRelationships",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_AvailableForSaleSecuritiesDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the entire disclosure related to available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.",
        "label": "Available for Sale Securities Disclosure [Text Block]",
        "terseLabel": "Available-for-sale Securities"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDisclosureTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecurities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available-for-sale securities with unrealized losses number of positions less than twelve months.",
        "label": "Available-for-Sale Securities with Unrealized Losses Number of Positions Less than Twelve Months",
        "terseLabel": "Number of available-for-sale securities in unrealized loss position for less than 12 months"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "fhlba_AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsTwelveMonthsOrMore": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available-for-sale securities with unrealized losses number of positions twelve months or more.",
        "label": "Available-for-Sale Securities with Unrealized Losses Number of Positions Twelve Months or More",
        "terseLabel": "Number of available-for-sale securities in unrealized loss position for 12 months or more"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesWithUnrealizedLossesNumberOfPositionsTwelveMonthsOrMore",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "fhlba_AvailableforSaleSecuritiesPrivateLabelResidentialMortgageBackedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available-for-Sale Securities, Private Label Residential Mortgage Backed Securities [Member]",
        "label": "Available-for-Sale Securities, Private Label Residential Mortgage Backed Securities [Member]",
        "terseLabel": "Available-for-Sale Securities, Private Label Residential Mortgage Backed Securities [Member]"
       }
      }
     },
     "localname": "AvailableforSaleSecuritiesPrivateLabelResidentialMortgageBackedSecuritiesMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_BankOfAmericaMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Bank of America [Member]",
        "label": "Bank of America [Member]",
        "terseLabel": "Bank of America [Member]"
       }
      }
     },
     "localname": "BankOfAmericaMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_CommonStockDividendAnnualizedRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Common Stock Dividend-Annualized Rate",
        "label": "Common Stock Dividend-Annualized Rate",
        "terseLabel": "Common Stock Dividend-Annualized Rate"
       }
      }
     },
     "localname": "CommonStockDividendAnnualizedRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockScheduleOfDeclaredAndPaidQuarterlyDividendsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_ConsolidatedObligationBondsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of joint and several obligations consisting of bonds issued by the Federal Home Loan Bank.",
        "label": "Consolidated Obligation Bonds [Member]",
        "terseLabel": "Consolidated Obligation Bonds [Member]"
       }
      }
     },
     "localname": "ConsolidatedObligationBondsMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_ConsolidatedObligationJointlyAndSeverallyLiable": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The FHLBank's outstanding consolidated obligations for which the reporting entity is jointly and severally liable.",
        "label": "Consolidated Obligation, Jointly and Severally Liable",
        "terseLabel": "The FHLBank's outstanding consolidated obligations for which the Bank is jointly and severally liable"
       }
      }
     },
     "localname": "ConsolidatedObligationJointlyAndSeverallyLiable",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_ConsolidatedObligationsDiscountNotesMaximumContractualMaturityPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Consolidated Obligations, Discount Notes, Maximum Contractual Maturity Period",
        "label": "Consolidated Obligations, Discount Notes, Maximum Contractual Maturity Period",
        "terseLabel": "Maximum contractual maturity period of discount notes (up to one year)"
       }
      }
     },
     "localname": "ConsolidatedObligationsDiscountNotesMaximumContractualMaturityPeriod",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "fhlba_CreditDerivativeExposureNet": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit Derivative Exposure Net",
        "label": "Credit Derivative Exposure Net",
        "terseLabel": "Credit Derivative Exposure Net"
       }
      }
     },
     "localname": "CreditDerivativeExposureNet",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_DebtInstrumentCallFeatureAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information about specific debt instruments call features.",
        "label": "Debt Instrument Call Feature [Axis]",
        "terseLabel": "Debt Instrument Call Feature [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentCallFeatureAxis",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_DebtInstrumentCallFeatureDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provides general categories of debt call features for which information is required or determined to be disclosed.",
        "label": "Debt Instrument Call Feature [Domain]",
        "terseLabel": "Debt Instrument Call Feature [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentCallFeatureDomain",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_DebtInstrumentInterestRatePaymentTermsNameAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt instrument interest rate payment terms, name.",
        "label": "Debt Instrument Interest Rate Payment Terms, Name [Axis]",
        "terseLabel": "Debt Instrument Interest Rate Payment Terms, Name [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentInterestRatePaymentTermsNameAxis",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_DebtInstrumentInterestRatePaymentTermsNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt instrument interest rate payment terms, name.",
        "label": "Debt Instrument Interest Rate Payment Terms Name [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentInterestRatePaymentTermsNameDomain",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_DebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonthsWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturing within the next twelve months following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Debt, Maturities, Repayments of Principal in Next Twelve Months, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due in one year or less, weighted average interest rate"
       }
      }
     },
     "localname": "DebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonthsWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_DebtValuationAdjustmentForHedgingActivities": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 9.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unrealized gain (loss) recognized in earnings for the cumulative period of the debt obligation in a fair value hedge, as offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.",
        "label": "Debt Valuation Adjustment for Hedging Activities",
        "terseLabel": "Hedging adjustments"
       }
      }
     },
     "localname": "DebtValuationAdjustmentForHedgingActivities",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_DeferredPrepaymentFeesonAdvances": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvances",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Deferred Prepayment Fees on Advances",
        "label": "Deferred Prepayment Fees on Advances",
        "negatedTerseLabel": "Deferred Prepayment Fees on Advances"
       }
      }
     },
     "localname": "DeferredPrepaymentFeesonAdvances",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_DerivativeInstrumentsOtherGainLoss": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other net gain (loss) on derivative instruments recognized in earnings during the period.",
        "label": "Derivative Instruments, Other Gain (Loss)",
        "terseLabel": "Derivative Instruments, Other Gain (Loss)"
       }
      }
     },
     "localname": "DerivativeInstrumentsOtherGainLoss",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_DerivativesInstrumentsandHedgingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivatives Instruments and Hedging Activities Disclosure [Abstract]",
        "label": "Derivatives Instruments and Hedging Activities Disclosure [Abstract]"
       }
      }
     },
     "localname": "DerivativesInstrumentsandHedgingActivitiesDisclosureAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "xbrltype": "stringItemType"
    },
    "fhlba_DocumentAndEntityInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Document and entity information.",
        "label": "Document and Entity Information [Abstract]"
       }
      }
     },
     "localname": "DocumentAndEntityInformationAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "xbrltype": "stringItemType"
    },
    "fhlba_EarlierOfContractualMaturityOrNextCallDateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Consolidated Obligations categorized by earlier of contractual maturity or next call date.",
        "label": "Earlier of Contractual Maturity or Next Call Date [Member]",
        "terseLabel": "Earlier of Contractual Maturity or Next Call Date [Member]"
       }
      }
     },
     "localname": "EarlierOfContractualMaturityOrNextCallDateMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_FairValueAssetsMeasuredonaRecurringBasisAccretionofCreditLossesinNetInterestIncome": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value, Assets Measured on a Recurring Basis, Accretion of Credit Losses in Net Interest Income",
        "label": "Fair Value, Assets Measured on a Recurring Basis Accretion of Credit Losses in Net Interest Income",
        "terseLabel": "Accretion of credit losses in net interest income"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredonaRecurringBasisAccretionofCreditLossesinNetInterestIncome",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FairValueDisclosureOffbalanceSheetRisksFaceAmountExpiringAfterOneYear": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition, which expire after one year of the balance sheet date.",
        "label": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year",
        "terseLabel": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year"
       }
      }
     },
     "localname": "FairValueDisclosureOffbalanceSheetRisksFaceAmountExpiringAfterOneYear",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FairValueDisclosureOffbalanceSheetRisksFaceAmountExpiringWithinOneYear": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition, which expire within one year of the balance sheet date.",
        "label": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year",
        "terseLabel": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year"
       }
      }
     },
     "localname": "FairValueDisclosureOffbalanceSheetRisksFaceAmountExpiringWithinOneYear",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalFundsSoldFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.",
        "label": "Federal Funds Sold, Fair Value Disclosure",
        "terseLabel": "Federal funds sold"
       }
      }
     },
     "localname": "FederalFundsSoldFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalHomeLoanBankAdvancesAllowanceForCreditLossesOnAdvances": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Allowance for Credit Losses on Advances",
        "label": "Federal Home Loan Bank, Advances, Allowance for Credit Losses on Advances",
        "verboseLabel": "Allowance for credit losses on advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesAllowanceForCreditLossesOnAdvances",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalHomeLoanBankAdvancesFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of the aggregate carrying amount of all Federal Home Loan Bank loans (advances).",
        "label": "Federal Home Loan Bank Advances, Fair Value Disclosure",
        "terseLabel": "Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalHomeLoanBankAdvancesPastDue": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Advances Past Due",
        "label": "Federal Home Loan Bank, Advances, Past Due",
        "verboseLabel": "Advances past due"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesPastDue",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalHomeLoanBankAdvancesTenLargestBorrowersPercentofTotal": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Federal Home Loan Bank Advances, Ten Largest Borrowers, Percent of Total",
        "label": "Federal Home Loan Bank Advances Ten Largest Borrowers Percent of Total",
        "terseLabel": "Advances Ten Largest Borrowers Percent of Total"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTenLargestBorrowersPercentofTotal",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_FederalHomeLoanBankAdvancestoTenLargestBorrowers": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Federal Home Loan Bank Advances to Ten Largest Borrowers",
        "label": "Federal Home Loan Bank Advances to Ten Largest Borrowers",
        "terseLabel": "Advances to Ten Largest Borrowers"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancestoTenLargestBorrowers",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_FederalHomeLoanBankConsolidatedObligationsCallableOptionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Right, but not the obligation, the Federal Home Loan Bank has to return the loan to the issuer at par without a prepayment penalty.",
        "label": "Federal Home Loan Bank, Consolidated Obligations, Callable Option [Member]",
        "terseLabel": "Callable [Member]"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligationsCallableOptionMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_FederalHomeLoanBankConsolidatedObligationsWithNoRelatedOptionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial instrument of the Federal Home Loan Bank that does not have an option associated with it.",
        "label": "Federal Home Loan Bank, Consolidated Obligations, With No Related Option [Member]",
        "terseLabel": "Noncallable [Member]"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligationsWithNoRelatedOptionMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_FederalHomeLoanBankShareholderPercentageofTotalInterestbearingDeposits": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents Federal Home Loan Bank shareholder interest-bearing deposits outstanding as a percentage of total Federal Home Loan Banks interest-bearing deposits outstanding as of the balance sheet date.",
        "label": "Federal Home Loan Bank Shareholder Percentage of Total Interest-bearing Deposits",
        "terseLabel": "Percent of Total Interest-bearing Deposits"
       }
      }
     },
     "localname": "FederalHomeLoanBankShareholderPercentageofTotalInterestbearingDeposits",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_FederalHomeLoanBankShareholderPercentageofTotalParValueAdvancesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents Federal Home Loan Bank shareholder advances outstanding as a percentage of total Federal Home Loan Banks advances outstanding as of the balance sheet date.",
        "label": "Federal Home Loan Bank Shareholder Percentage of Total Par Value Advances Outstanding",
        "terseLabel": "Percent of Total Par Value Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankShareholderPercentageofTotalParValueAdvancesOutstanding",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_FederalHomeLoanBankShareholderPercentageofTotalRegulatoryCapitalStockOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents Federal Home Loan Bank shareholder percentage of total regulatory capital stock outstanding.",
        "label": "Federal Home Loan Bank Shareholder Percentage of Total Regulatory Capital Stock Outstanding",
        "terseLabel": "Percent of Total Regulatory Capital Stock Outstanding"
       }
      }
     },
     "localname": "FederalHomeLoanBankShareholderPercentageofTotalRegulatoryCapitalStockOutstanding",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_FixedInterestRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial instruments with a fixed rate of interest.",
        "label": "Fixed Interest Rate [Member]",
        "terseLabel": "Fixed-rate [Member]"
       }
      }
     },
     "localname": "FixedInterestRateMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_GainLossOnFairValueHedgesRecognizedInNetInterestIncome": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total amount of gain (loss) derived from fair value hedges recognized in net interest income in the period.",
        "label": "Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income",
        "verboseLabel": "Gain (Loss) on Fair Value Hedges Recognized in Net Interest Income"
       }
      }
     },
     "localname": "GainLossOnFairValueHedgesRecognizedInNetInterestIncome",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_GainLossonFairValueHedgesRecognizedinNetInterestIncomeBeforePriceAlignmentInterest": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gain Loss on Fair Value Hedges Recognized in Net Interest Income Before Price Alignment Interest",
        "label": "GainLossonFairValueHedgesRecognizedinNetInterestIncomeBeforePriceAlignmentInterest",
        "terseLabel": "GainLossonFairValueHedgesRecognizedinNetInterestIncomeBeforePriceAlignmentInterest"
       }
      }
     },
     "localname": "GainLossonFairValueHedgesRecognizedinNetInterestIncomeBeforePriceAlignmentInterest",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_GrantorTrustAssetsIncludedInOtherAssetsFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Grantor Trust Assets Included in Other Assets",
        "label": "Grantor Trust Assets Included in Other Assets, Fair Value Disclosure",
        "terseLabel": "Grantor trust assets (included in Other assets)"
       }
      }
     },
     "localname": "GrantorTrustAssetsIncludedInOtherAssetsFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, active as of the balance sheet date.",
        "label": "Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedAssetActiveFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk,  active as of the balance sheet date.",
        "label": "Hedged Liability,Active Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Liability,Active Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedLiabilityActiveFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_HeldToMaturitySecuritiesAcquiredWithAccruedLiabilities": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Held-to-maturity securities acquired with accrued liabilities.",
        "label": "Held to Maturity Securities Acquired with Accrued Liabilities",
        "terseLabel": "Held-to-maturity securities acquired with accrued liabilities"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesAcquiredWithAccruedLiabilities",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_HeldToMaturitySecuritiesDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the entire disclosure related to all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity.",
        "label": "Held to Maturity Securities Disclosure [Text Block]",
        "terseLabel": "Held-to-maturity Securities"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesDisclosureTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecurities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Held-to-maturity securities with unrealized losses number of positions, less than twelve months.",
        "label": "Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months",
        "verboseLabel": "Number of unrealized loss positions held less than 12 months"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsLessThanTwelveMonths",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsTwelveMonthsOrLonger": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Held-to-maturity securities with unrealized losses number of positions, twelve months or longer.",
        "label": "Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer",
        "verboseLabel": "Number of unrealized loss positions held more than 12 months"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesWithUnrealizedLossesNumberOfPositionsTwelveMonthsOrLonger",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_IncreaseDecreaseInAffordableHousingProgramAssessments": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the period in amount of the obligation related to Affordable Housing Program (AHP) assessments, as required by the Federal Home Loan Bank Act of 1932. These AHP funds provide subsidies to members to assist in the purchase, construction, or rehabilitation of housing for very low-, low-, and moderate-income households.",
        "label": "Increase Decrease in Affordable Housing Program Assessments",
        "terseLabel": "Affordable Housing Program payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAffordableHousingProgramAssessments",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_InterestAndAssessmentsPaidAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and Assessments Paid [Abstract]",
        "label": "Interest and Assessments Paid [Abstract]",
        "terseLabel": "Cash paid for:"
       }
      }
     },
     "localname": "InterestAndAssessmentsPaidAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_InterestBearingDepositsFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of - For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.",
        "label": "Interest-bearing Deposits, Fair Value Disclosure",
        "terseLabel": "Interest-bearing Deposits, Fair Value Disclosure"
       }
      }
     },
     "localname": "InterestBearingDepositsFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_InterestRateCapsorFloorsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract in which the cap writer, in return for a premium, agrees to limit, or cap, the cap holder's risk associated with an increase in interest rates or in which the floor writer, in return for a premium, agrees to limit the risk associated with a decline in interest rates based on a notional amount.",
        "label": "Interest Rate Caps or Floors [Member]",
        "terseLabel": "Interest rate caps or floors [Member]"
       }
      }
     },
     "localname": "InterestRateCapsorFloorsMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_InterestRatePaymentTypeSimpleVariableRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest-rate payment type simple variable-rate.",
        "label": "Interest Rate Payment Type Simple Variable Rate [Member]",
        "verboseLabel": "Simple variable-rate [Member]"
       }
      }
     },
     "localname": "InterestRatePaymentTypeSimpleVariableRateMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_InterestRatePaymentTypeStepUpOrDownMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest-rate payment type step up or down.",
        "label": "Interest Rate Payment Type Step Up or Down [Member]",
        "verboseLabel": "Step up/down [Member]"
       }
      }
     },
     "localname": "InterestRatePaymentTypeStepUpOrDownMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_LeverageRatioRequired": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leverage ratio requirement as defined in the regulations.",
        "label": "Leverage Ratio, Required",
        "terseLabel": "Leverage capital ratio, Required"
       }
      }
     },
     "localname": "LeverageRatioRequired",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LoansAndLeasesReceivableUnamortizedDiscounts": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails": {
       "order": 3.0,
       "parentTag": "fhlba_LoansandLeasesReceivableGrossConsumerMortgage",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the cumulative amount of discounts from the face amount of loans that are being amortized into income as an adjustment of yield.",
        "label": "Loans and Leases Receivable, Unamortized Discounts",
        "negatedTerseLabel": "Discounts"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableUnamortizedDiscounts",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_LoansAndLeasesReceivableUnamortizedPremiums": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails": {
       "order": 2.0,
       "parentTag": "fhlba_LoansandLeasesReceivableGrossConsumerMortgage",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the cumulative amount of premiums over the face amount of loans that are being amortized into income as an adjustment to yield.",
        "label": "Loans and Leases Receivable, Unamortized Premiums",
        "terseLabel": "Premiums"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableUnamortizedPremiums",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_LoansAndLeasesReceivableUnpaidPrincipalBalance": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails": {
       "order": 1.0,
       "parentTag": "fhlba_LoansandLeasesReceivableGrossConsumerMortgage",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reflects the aggregate unpaid principal balance of all categories of loans and leases held in portfolio.",
        "label": "Loans and Leases Receivable, Unpaid Principal Balance",
        "terseLabel": "Unpaid principal balance"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableUnpaidPrincipalBalance",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_LoansReceivableWithFixedRatesOfInterestLongTermMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A mortgage loan issued by a bank with a fixed rate of interest and a repayment period of more than 15 years.",
        "label": "Loans Receivable With Fixed Rates of Interest Long Term [Member]",
        "terseLabel": "Fixed-rate long-term residential mortgage loans [Member]"
       }
      }
     },
     "localname": "LoansReceivableWithFixedRatesOfInterestLongTermMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_LoansReceivableWithFixedRatesOfInterestMediumTermMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A mortgage loan issued by a bank with a fixed rate of interest and a repayment period of 15 years or less.",
        "label": "Loans Receivable With Fixed Rates of Interest Medium Term [Member]",
        "terseLabel": "Fixed-rate medium-term residential mortgage loans [Member]"
       }
      }
     },
     "localname": "LoansReceivableWithFixedRatesOfInterestMediumTermMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_LoansandLeasesReceivableGrossConsumerMortgage": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements",
        "label": "Loans and Leases Receivable, Gross, Consumer, Mortgage",
        "totalLabel": "Total mortgage loans held for portfolio"
       }
      }
     },
     "localname": "LoansandLeasesReceivableGrossConsumerMortgage",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_LoansandLeasesReceivableSeriousDelinquenciesRatio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Loans that are 90 days or more past due or in the process of foreclosure as a percentage of total mortgage loans outstanding.",
        "label": "Loans and Leases Receivable, Serious Delinquencies Ratio",
        "terseLabel": "Seriously delinquent rate"
       }
      }
     },
     "localname": "LoansandLeasesReceivableSeriousDelinquenciesRatio",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LongTermDebtByMaturityTypeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information about Consolidated Obligations' date of contractual maturity or next call date.",
        "label": "Long-term Debt By Maturity Type [Axis]",
        "terseLabel": "Long-term Debt By Maturity Type [Axis]"
       }
      }
     },
     "localname": "LongTermDebtByMaturityTypeAxis",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_LongTermDebtByMaturityTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provides categories for contractual maturity date or next call date of Consolidated Obligations.",
        "label": "Long-term Debt By Maturity Type [Domain]",
        "terseLabel": "Long-term Debt By Maturity Type [Domain]"
       }
      }
     },
     "localname": "LongTermDebtByMaturityTypeDomain",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFiveWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturities after year five following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Long-term Debt, Maturities, Repayments of Principal After Year Five, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due after five years, weighted average interest rate"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFiveWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFiveWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturing in year five following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Five, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due after four years through five years, weighted average interest rate"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFiveWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFourWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturing in year four following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Four, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due after three years through four years, weighted average interest rate"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFourWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThreeWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturing in year three following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Three, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due after two years through three years, weighted average interest rate"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThreeWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwoWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of the amount of Consolidated Obligation Bonds maturing in year two following the date of the latest balance sheet, redeemable at fixed or determinable prices and dates.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Year Two, Weighted Average Interest Rate",
        "terseLabel": "Bonds, Due after one year through two years, weighted average interest rate"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwoWeightedAverageInterestRate",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_MBSIssuedByMembersOrAffiliatesOfMembersMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "M B S issued by members or affiliates of members.",
        "label": "M B S Issued by Members or Affiliates of Members [Member]",
        "verboseLabel": "M B S Issued by Members or Affiliates of Members [Member]"
       }
      }
     },
     "localname": "MBSIssuedByMembersOrAffiliatesOfMembersMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_MortgageLoansOnRealEstateOriginalContractualTerms": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Mortgage Loans on Real Estate, Original Contractual Terms",
        "label": "Mortgage Loans on Real Estate, Original Contractual Terms",
        "terseLabel": "Mortgage Loans on Real Estate, Original Contractual Terms"
       }
      }
     },
     "localname": "MortgageLoansOnRealEstateOriginalContractualTerms",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "fhlba_NavyFederalCreditUnionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Navy Federal Credit Union",
        "label": "Navy Federal Credit Union [Member]",
        "terseLabel": "Navy Federal Credit Union [Member]"
       }
      }
     },
     "localname": "NavyFederalCreditUnionMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_NetInterestSettlements": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents interest income/expense on derivatives in qualifying fair-value hedging relationships. Does not include interest income/expense of the respective hedged item.",
        "label": "Net Interest Settlements",
        "terseLabel": "Net Interest Settlements"
       }
      }
     },
     "localname": "NetInterestSettlements",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_NetInterestSettlementsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net interest settlements of Economic Hedges.",
        "label": "Net Interest Settlements [Member]",
        "terseLabel": "Net Interest Settlements [Member]"
       }
      }
     },
     "localname": "NetInterestSettlementsMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_NetNoncreditPortionOfOtherThanTemporaryImpairmentLossesOnAvailableForSaleSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Not applicable.",
        "label": "Net Noncredit Portion of Other than Temporary Impairment Losses on Available for Sale Securities [Abstract]",
        "verboseLabel": "Net noncredit portion of other-than-temporary impairment losses on available-for-sale securities:"
       }
      }
     },
     "localname": "NetNoncreditPortionOfOtherThanTemporaryImpairmentLossesOnAvailableForSaleSecuritiesAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_NumberOfFederalHomeLoanBanks": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of Federal Home Loan Banks",
        "label": "Number of Federal Home Loan Banks",
        "terseLabel": "Number of Federal Home Loan Banks"
       }
      }
     },
     "localname": "NumberOfFederalHomeLoanBanks",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_NumberOfOutstandingStandbyLettersOfCreditRenewableAnnually": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of outstanding standby letters of credit, renewable annually.",
        "label": "Number Of Outstanding Standby Letters Of Credit Renewable Annually",
        "terseLabel": "Number Of Outstanding Standby Letters Of Credit Renewable Annually"
       }
      }
     },
     "localname": "NumberOfOutstandingStandbyLettersOfCreditRenewableAnnually",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_NumberofThirdPartyModelstoAssessRecoveryofAmortizedCostBasisofSecurities": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of Third Party Models to Assess Recovery of Amortized Cost Basis of Securities",
        "label": "Number of Third Party Models to Assess Recovery of Amortized Cost Basis of Securities",
        "terseLabel": "Number of Third Party Models to Assess Recovery of Amortized Cost Basis of Securities"
       }
      }
     },
     "localname": "NumberofThirdPartyModelstoAssessRecoveryofAmortizedCostBasisofSecurities",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentHousingPriceForecastNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_NumberofTopAdvancesBorrowers": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of Top Advances Borrowers",
        "label": "Number of Top Advances Borrowers",
        "terseLabel": "Number of Top Advances Borrowers"
       }
      }
     },
     "localname": "NumberofTopAdvancesBorrowers",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesCreditRiskNarrativeDetailsTextual"
     ],
     "xbrltype": "integerItemType"
    },
    "fhlba_OtherComprehensiveIncomeLossOtherThanTemporaryImpairmentLossesAvailableForSaleSecuritiesAdjustment": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of total net non-credit portion of other than temporary impairment (OTTI) related losses on debt securities categorized as Available-for-sale.",
        "label": "Other Comprehensive Income (Loss) Other Than Temporary Impairment Losses Available for Sale Securities Adjustment",
        "totalLabel": "Total net noncredit portion of other-than-temporary impairment losses on available-for-sale securities"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossOtherThanTemporaryImpairmentLossesAvailableForSaleSecuritiesAdjustment",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_OtherEffectsfromFairValueHedgingRelationships": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Effects from Fair Value Hedging Relationships",
        "label": "Other Effects from Fair Value Hedging Relationships",
        "terseLabel": "Other Effects from Fair Value Hedging Relationships"
       }
      }
     },
     "localname": "OtherEffectsfromFairValueHedgingRelationships",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_OtherThanMortgageBackedSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the total of non-mortgage backed securities, which may be issued by federal, state or local government and/or by other non-mortgage related entities",
        "label": "Other Than Mortgage Backed Securities [Member]",
        "terseLabel": "Non Mortgage Backed Securities [Member]"
       }
      }
     },
     "localname": "OtherThanMortgageBackedSecuritiesMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentspeedWeightedAverage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Estimated weighted average rate of speed of prepayments of principal on financial assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities as of the date of the latest statement of financial position presented.",
        "label": "Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held Assumption For Measurement Prepayment speed Weighted Average",
        "terseLabel": "Significant Inputs Weighted Average Percentage Rate, Prepayment Rate"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeldAssumptionForMeasurementPrepaymentspeedWeightedAverage",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditlossesOnDebtSecuritiesHeldAssumptionForMeasurementLossSeverityWeightedAverage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The estimated weighted average loss severity expected to be incurred on Other Than Temporary Impairment credit losses recognized in earnings.",
        "label": "Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit losses On Debt Securities Held Assumption For Measurement Loss Severity Weighted Average",
        "terseLabel": "Significant Inputs Weighted Average Percentage Rate, Loss Severities"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditlossesOnDebtSecuritiesHeldAssumptionForMeasurementLossSeverityWeightedAverage",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the entire disclosure related to the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income.",
        "label": "Other than Temporary Impairment Credit Losses Recognized in Earnings Disclosure [Text Block]",
        "verboseLabel": "Other-than-temporary Impairment"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsDisclosureTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairment"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_OtherthanTemporaryImpairmentCreditLossesRecognizedinEarningsAdditionalCreditLosses": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additional Credit Losses",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additional Credit Losses",
        "terseLabel": "Included in net impairment losses recognized in earnings"
       }
      }
     },
     "localname": "OtherthanTemporaryImpairmentCreditLossesRecognizedinEarningsAdditionalCreditLosses",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_OtherthanTemporaryImpairmentHousingPriceForecastNarrativeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other than Temporary Impairment (Housing Price Forecast Narrative) [Abstract]",
        "label": "Other than Temporary Impairment (Housing Price Forecast Narrative) [Abstract]"
       }
      }
     },
     "localname": "OtherthanTemporaryImpairmentHousingPriceForecastNarrativeAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "xbrltype": "stringItemType"
    },
    "fhlba_OtherthanTemporaryImpairmentLossesInvestmentsPortionReclassifiedToOrFromOtherComprehensiveLossbeforeTaxPortionAttributabletoParentNet": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale debt securities, reclassified to or from other comprehensive loss and attributable to parent entity.",
        "label": "OtherthanTemporaryImpairmentLossesInvestmentsPortionReclassifiedToOrFromOtherComprehensiveLossbeforeTaxPortionAttributabletoParentNet",
        "terseLabel": "Net amount of impairment losses reclassified from accumulated other comprehensive income"
       }
      }
     },
     "localname": "OtherthanTemporaryImpairmentLossesInvestmentsPortionReclassifiedToOrFromOtherComprehensiveLossbeforeTaxPortionAttributabletoParentNet",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_ProceedsFromSaleOfFederalHomeLoanBankAdvancesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Proceeds from sale of federal home loan bank advances.",
        "label": "Proceeds from Sale of Federal Home Loan Bank Advances [Abstract]",
        "verboseLabel": "Advances:"
       }
      }
     },
     "localname": "ProceedsFromSaleOfFederalHomeLoanBankAdvancesAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_RedemptionPeriodForExcessCapitalStock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The five year period after the Bank receives notification that a member would like to redeem activity-based capital stock.",
        "label": "Redemption Period For Excess Capital Stock",
        "terseLabel": "Redemption Period For Excess Capital Stock"
       }
      }
     },
     "localname": "RedemptionPeriodForExcessCapitalStock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "fhlba_RegulatoryCapitalRatioRequired": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory capital ratio requirement as defined in the regulations.",
        "label": "Regulatory Capital Ratio, Required",
        "terseLabel": "Total regulatory capital ratio, Required"
       }
      }
     },
     "localname": "RegulatoryCapitalRatioRequired",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Members with 10 percent or more of the voting interests of our capital stock outstanding",
        "label": "RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage",
        "terseLabel": "Definition of related party, minimum percent"
       }
      }
     },
     "localname": "RelatedPartyTransactionDefinitionOfRelatedPartyCapitalStockPercentage",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_ScheduleOfAvailableForSaleSecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the reconciliation of available-for-sale securities issued by members or affiliates of members from cost basis to fair value.",
        "label": "Schedule of Available for Sale Securities Issued by Members or Affiliates of Members Reconciliation [Table Text Block]",
        "verboseLabel": "Summary of Available-for-Sale MBS Issued by Members or Affiliates of Members"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfConsolidatedObligationBondsByCallFeatureTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of callable and noncallable consolidated obligation bonds outstanding.",
        "label": "Schedule Of Consolidated Obligation Bonds By Call Feature [Table Text Block]",
        "verboseLabel": "Callable and Noncallable Consolidated Obligations Bonds Outstanding"
       }
      }
     },
     "localname": "ScheduleOfConsolidatedObligationBondsByCallFeatureTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfConsolidatedObligationBondsByInterestRatePaymentTermsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of interest rate payment terms for debt.",
        "label": "Schedule Of Consolidated Obligation Bonds By Interest Rate Payment Terms [Table Text Block]",
        "terseLabel": "Consolidated Obligation Bonds by Interest-Rate Payment"
       }
      }
     },
     "localname": "ScheduleOfConsolidatedObligationBondsByInterestRatePaymentTermsTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfHeldToMaturitySecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the reconciliation of held-to-maturity securities issued by members or affiliates of members from amortized cost to fair value.",
        "label": "Schedule of Held to Maturity Securities Issued by Members or Affiliates of Members Reconciliation [Table Text Block]",
        "verboseLabel": "Held-to-Maturity MBS Issued by Members or Affiliates of Members"
       }
      }
     },
     "localname": "ScheduleOfHeldToMaturitySecuritiesIssuedByMembersOrAffiliatesOfMembersReconciliationTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfMandatorilyRedeemableCapitalStockByMaturityDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of mandatorily redeemable capital stock by year of redemption.",
        "label": "Schedule of Mandatorily Redeemable Capital Stock by Maturity Date [Table Text Block]",
        "verboseLabel": "Amount of Mandatorily Redeemable Capital Stock by Year of Redemption"
       }
      }
     },
     "localname": "ScheduleOfMandatorilyRedeemableCapitalStockByMaturityDateTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfMandatorilyRedeemableCapitalStockTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the changes in the balance of mandatorily redeemable capital stock.",
        "label": "Schedule of Mandatorily Redeemable Capital Stock [Table Text Block]",
        "terseLabel": "Schedule of Mandatorily Redeemable Capital Stock [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfMandatorilyRedeemableCapitalStockTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfMaturitiesOfConsolidatedObligationBondsByContractualOrNextCallDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of consolidated obligation bonds outstanding by year of contractual maturity or next call date.",
        "label": "Schedule Of Maturities of Consolidated Obligation Bonds By Contractual Or Next Call Date [Table Text Block]",
        "verboseLabel": "Summary of Callable Consolidated Obligation Bonds Outstanding, by Year of Contractual Maturity"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfConsolidatedObligationBondsByContractualOrNextCallDateTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleOfProjectedHomePriceRecoveryRangesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of projected home price recovery ranges.",
        "label": "Schedule of Projected Home Price Recovery Ranges [Line Items]",
        "terseLabel": "Schedule of Projected Home Price Recovery Ranges [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfProjectedHomePriceRecoveryRangesLineItems",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentHousingPriceForecastNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_ScheduleOfProjectedHomePriceRecoveryRangesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of projected home price recovery ranges.",
        "label": "Schedule Of Projected Home Price Recovery Ranges [Table]",
        "terseLabel": "Schedule Of Projected Home Price Recovery Ranges [Table]"
       }
      }
     },
     "localname": "ScheduleOfProjectedHomePriceRecoveryRangesTable",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentHousingPriceForecastNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearningsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Table Text Block] for Significant inputs uses to measure the amount of the credit loss recognized in earnings for those securities for which an other-than-temporary impairment was determin3ed to have occurred as well as the related current credit enhancement.",
        "label": "ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearnings [Table Text Block]",
        "terseLabel": "ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearnings [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleofSignifcantinputsinMeasuringOtherthantemporaryimpairmentsrecognizedinearningsTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleofTransactionswith10PercentShareholdersTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of shareholder concentration with members and non-members that held ten percent or more of regulatory capital stock.",
        "label": "Schedule of Transactions with 10 Percent Shareholders [Table Text Block]",
        "terseLabel": "Schedule of Transactions with Shareholders [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleofTransactionswith10PercentShareholdersTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_ScheduleofTransactionswithShareholdersLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items for Schedule of Transactions with Shareholders [Table]",
        "label": "Schedule of Transactions with Shareholders [Line Items]",
        "terseLabel": "Minimum"
       }
      }
     },
     "localname": "ScheduleofTransactionswithShareholdersLineItems",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_ScheduleofTransactionswithShareholdersTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of Transactions with Shareholders [Table]",
        "label": "Schedule of Transactions with Shareholders [Table]",
        "terseLabel": "Schedule of Transactions with Shareholders [Table]"
       }
      }
     },
     "localname": "ScheduleofTransactionswithShareholdersTable",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_ScheduleofdeclaredquarterlycashdividendsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the Bank's declared and paid quarterly cash dividends.",
        "label": "Schedule of declared quarterly cash dividends [Table Text Block]",
        "terseLabel": "Schedule of declared quarterly cash dividends [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleofdeclaredquarterlycashdividendsTableTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_SecuritiesPurchasedUnderAgreementsToResellFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value disclosure of the carrying value of funds outstanding loaned in the form of security resale agreements if the agreement requires the purchaser to resell the identical security purchased or a security that meets the definition of \"substantially the same.\" Also includes purchases of participations in pools of securities that are subject to a resale agreement.",
        "label": "Securities Purchased under Agreements to Resell, Fair Value Disclosure",
        "terseLabel": "Securities purchased under agreements to resell"
       }
      }
     },
     "localname": "SecuritiesPurchasedUnderAgreementsToResellFairValueDisclosure",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_SingleFamilyMortgageBackedSecuritiesOtherUSObligationMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt securities collateralized by single family real estate mortgage loans (mortgages), issued by US government agencies, such as the Government National Mortgage Association (GNMA or Ginnie Mae). Excludes mortgage backed securities issued by Government-sponsored Enterprises (GSEs), which are not backed by the full faith and credit of the US",
        "label": "SingleFamilyMortgageBackedSecuritiesOtherUSObligation [Member]",
        "terseLabel": "U.S. agency obligations-guaranteed residential"
       }
      }
     },
     "localname": "SingleFamilyMortgageBackedSecuritiesOtherUSObligationMember",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_StandbyLettersOfCreditIssuedRenewableAnnually": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Standby letters of credit issued, renewable annually.",
        "label": "Standby Letters Of Credit Issued Renewable Annually",
        "terseLabel": "Standby Letters Of Credit Issued Renewable Annually"
       }
      }
     },
     "localname": "StandbyLettersOfCreditIssuedRenewableAnnually",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_Standbylettersofcreditfees": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fees related to Stand by letters of credit",
        "label": "Standby letters of credit fees",
        "verboseLabel": "Standby letters of credit fees"
       }
      }
     },
     "localname": "Standbylettersofcreditfees",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "fhlba_SubclassB1Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subclass B1.",
        "label": "Subclass B1 [Member]",
        "verboseLabel": "Subclass B1 [Member]"
       }
      }
     },
     "localname": "SubclassB1Member",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_SubclassB2Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subclass B2.",
        "label": "Subclass B2 [Member]",
        "verboseLabel": "Subclass B2 [Member]"
       }
      }
     },
     "localname": "SubclassB2Member",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_TradingSecuritiesAndCertainTradingAssetsDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the entire disclosure related to trading securities (and certain trading assets) which consist of all investments in certain debt and equity securities (and other assets) that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.",
        "label": "Trading Securities and Certain Trading Assets Disclosure [Text Block]",
        "verboseLabel": "Trading Securities"
       }
      }
     },
     "localname": "TradingSecuritiesAndCertainTradingAssetsDisclosureTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecurities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_TransactionsWithShareholdersAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transactions With Shareholders [Abstract]",
        "label": "Transactions With Shareholders [Abstract]"
       }
      }
     },
     "localname": "TransactionsWithShareholdersAbstract",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "xbrltype": "stringItemType"
    },
    "fhlba_TransactionsWithShareholdersTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of shareholder concentrations as members or non-members with more than 10 percent of the Bank's total regulatory capital stock.",
        "label": "TransactionsWithShareholders [Text Block]",
        "terseLabel": "Transactions With Shareholders"
       }
      }
     },
     "localname": "TransactionsWithShareholdersTextBlock",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholders"
     ],
     "xbrltype": "textBlockItemType"
    },
    "fhlba_TransactionswithShareholdersAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transactions with Shareholders",
        "label": "Transactions with Shareholders [Axis]",
        "terseLabel": "Transactions with Shareholders [Axis]"
       }
      }
     },
     "localname": "TransactionswithShareholdersAxis",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "fhlba_TransactionswithShareholdersDefinitionofShareholderConcentrationRegulatoryCapitalStockPercent": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Shareholders whose regulatory capital stock holdings are in excess of 10 percent of total regulatory capital stock outstanding.",
        "label": "Transactions with Shareholders Definition of Shareholder Concentration Regulatory Capital Stock Percent",
        "terseLabel": "Definition of shareholder concentration, percentage"
       }
      }
     },
     "localname": "TransactionswithShareholdersDefinitionofShareholderConcentrationRegulatoryCapitalStockPercent",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "fhlba_TransactionswithShareholdersDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transactions with Shareholders",
        "label": "Transactions with Shareholders [Domain]",
        "terseLabel": "Transactions with Shareholders [Domain]"
       }
      }
     },
     "localname": "TransactionswithShareholdersDomain",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "fhlba_VariationMarginforDailySettledContractsNet": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net amount of obligation paid to (received from) the counterparty, that is adjusted daily based upon the fair value of the derivative instrument associated with the financial instrument or other contract.",
        "label": "Variation Margin for Daily Settled Contracts, Net",
        "terseLabel": "Variation Margin for Daily Settled Contracts, Net"
       }
      }
     },
     "localname": "VariationMarginforDailySettledContractsNet",
     "nsuri": "http://www.fhlbatl.com/20190630",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "invest_DerivativeNotionalAmount": {
     "auth_ref": [
      "r326"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.",
        "label": "Derivative, Notional Amount",
        "terseLabel": "Total notional amount of derivatives before netting and collateral adjustments"
       }
      }
     },
     "localname": "DerivativeNotionalAmount",
     "nsuri": "http://xbrl.sec.gov/invest/2013-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "invest_InvestmentSectorAxis": {
     "auth_ref": [
      "r325"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an investments table in which investments are categorized by sector (industry, market, customer tier, etc.) this axis contains the members of that categorization.",
        "label": "Investment Sector [Axis]",
        "terseLabel": "Investment Sector [Axis]"
       }
      }
     },
     "localname": "InvestmentSectorAxis",
     "nsuri": "http://xbrl.sec.gov/invest/2013-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "invest_InvestmentSectorDomain": {
     "auth_ref": [
      "r325"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an investments table in which investments are categorized by sector (industry, market, customer tier, etc.) this domain represents all members of that categorization.",
        "label": "Investment Sector [Domain]",
        "terseLabel": "Investment Sector [Domain]"
       }
      }
     },
     "localname": "InvestmentSectorDomain",
     "nsuri": "http://xbrl.sec.gov/invest/2013-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis": {
     "auth_ref": [
      "r319",
      "r320"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Real Estate, Type of Property [Axis]",
        "terseLabel": "Real Estate, Type of Property [Axis]"
       }
      }
     },
     "localname": "MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_MortgageLoansOnRealEstateNamePropertyTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Real Estate [Domain]",
        "terseLabel": "Real Estate [Domain]"
       }
      }
     },
     "localname": "MortgageLoansOnRealEstateNamePropertyTypeDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MultifamilyMember": {
     "auth_ref": [
      "r319",
      "r320"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Multifamily [Member]",
        "terseLabel": "Commercial [Member]"
       }
      }
     },
     "localname": "MultifamilyMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Axis]",
        "terseLabel": "Statistical Measurement [Axis]"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentHousingPriceForecastNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Domain]",
        "terseLabel": "Statistical Measurement [Domain]"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentHousingPriceForecastNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_SingleFamilyMember": {
     "auth_ref": [
      "r319",
      "r320"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Single Family [Member]",
        "terseLabel": "Residential [Member]"
       }
      }
     },
     "localname": "SingleFamilyMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AOCIAttributableToParentNetOfTaxRollForward": {
     "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": "AOCI Attributable to Parent, Net of Tax [Roll Forward]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Roll Forward]"
       }
      }
     },
     "localname": "AOCIAttributableToParentNetOfTaxRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis": {
     "auth_ref": [
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of receivable.",
        "label": "Receivable Type [Axis]",
        "terseLabel": "Receivable Type [Axis]"
       }
      }
     },
     "localname": "AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": {
     "auth_ref": [
      "r41",
      "r44",
      "r45",
      "r191",
      "r197"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent.",
        "label": "Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]",
        "terseLabel": "Pension and Postretirement Benefits [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember": {
     "auth_ref": [
      "r37",
      "r38",
      "r39",
      "r44",
      "r45"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.",
        "label": "AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]",
        "terseLabel": "Noncredit Portion of Other Than Temporary Impairment Losses on Available for Sale Securities [Member]"
       }
      }
     },
     "localname": "AccumulatedNetUnrealizedInvestmentGainLossMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeFederalHomeLoanBankAssessments": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, before Federal Home Loan Bank (FHLBank) assessments. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). Includes, but is not limited to, foreign currency translation, certain pension adjustments, unrealized gain (loss) on certain investments in debt and equity securities, other than temporary impairment (OTTI) loss related to factors other than credit loss on available-for-sale and held-to-maturity debt securities, and increase (decrease) in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated Other Comprehensive Income (Loss), before Federal Home Loan Bank Assessments",
        "periodEndLabel": "Accumulated Other Comprehensive Income (Loss), End of period",
        "periodStartLabel": "Accumulated Other Comprehensive Income (Loss), Beginning of period",
        "verboseLabel": "Accumulated other comprehensive income"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossBeforeFederalHomeLoanBankAssessments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "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) [Line Items]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities": {
     "auth_ref": [
      "r44",
      "r109",
      "r113"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.",
        "label": "Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities",
        "negatedTerseLabel": "Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income",
        "terseLabel": "Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss).",
        "label": "Accumulated Other Comprehensive Income (Loss) [Table]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Table]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r42",
      "r44",
      "r45",
      "r197"
     ],
     "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": "Total Accumulated Other Comprehensive Income (Loss) [Member]",
        "verboseLabel": "Accumulated Other Comprehensive Income [Member]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalCollateralAggregateFairValue": {
     "auth_ref": [
      "r223"
     ],
     "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": "Additional Collateral, Aggregate Fair Value"
       }
      }
     },
     "localname": "AdditionalCollateralAggregateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r69"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.",
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities",
        "totalLabel": "Total adjustments"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "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]",
        "verboseLabel": "Adjustments to reconcile net income to net cash provided by operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AffordableHousingProgramAssessments": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.",
        "label": "Affordable Housing Program Assessments",
        "verboseLabel": "Affordable Housing Program assessment"
       }
      }
     },
     "localname": "AffordableHousingProgramAssessments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AffordableHousingProgramObligation": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.",
        "label": "Affordable Housing Program Obligation",
        "verboseLabel": "Affordable Housing Program payable"
       }
      }
     },
     "localname": "AffordableHousingProgramObligation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r92",
      "r142"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on financing receivable.",
        "label": "Financing Receivable, Allowance for Credit Loss [Table Text Block]",
        "terseLabel": "Allowance for Credit Losses on Financing Receivables"
       }
      }
     },
     "localname": "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AllowanceForCreditLossesTextBlock": {
     "auth_ref": [
      "r104"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for allowance for credit losses.",
        "label": "Allowance for Credit Losses [Text Block]",
        "terseLabel": "Allowance for Credit Losses"
       }
      }
     },
     "localname": "AllowanceForCreditLossesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLosses"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r87",
      "r264",
      "r308"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets [Abstract]",
        "verboseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsFairValueDisclosure": {
     "auth_ref": [
      "r232"
     ],
     "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",
        "terseLabel": "Total recurring assets at fair value"
       }
      }
     },
     "localname": "AssetsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "auth_ref": [
      "r114"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax",
        "terseLabel": "Gross unrealized gains on available-for-sale securities"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [
      "r115"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax",
        "terseLabel": "Gross unrealized losses on available-for-sale securities"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": {
     "auth_ref": [
      "r111",
      "r154"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Amortized Cost",
        "terseLabel": "Amortized cost of available-for-sale securities",
        "totalLabel": "Amortized cost of available-for-sale securities"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Available-for-sale [Abstract]"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax",
        "terseLabel": "Gross unrealized losses on available-for-sale securities"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
        "negatedTerseLabel": "Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss": {
     "auth_ref": [
      "r128"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss",
        "negatedTotalLabel": "Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value",
        "totalLabel": "Estimated fair value of available-for-sale securities in unrealized loss position"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
        "terseLabel": "Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value",
        "terseLabel": "Estimated fair value of available-for-sale securities in unrealized loss position for less than 12 months"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value",
        "terseLabel": "Estimated fair value of available-for-sale securities in unrealized loss position for 12 months or more"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtSecurities": {
     "auth_ref": [
      "r105",
      "r112",
      "r154"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_MarketableSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale",
        "terseLabel": "Available-for-sale securities",
        "verboseLabel": "Available-for-sale Securities"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.",
        "label": "Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions",
        "totalLabel": "Number of available-for-sale securities in unrealized loss position"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_AvailableforsaleSecuritiesMember": {
     "auth_ref": [
      "r135"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Available-for-sale Securities [Member]",
        "terseLabel": "Available-for-sale Securities [Member]",
        "verboseLabel": "Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables"
     ],
     "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 Accounting [Text Block]"
       }
      }
     },
     "localname": "BasisOfAccountingPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/BasisOfPresentationPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock": {
     "auth_ref": [
      "r84"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the basis of presentation and significant accounting policies concepts. 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).  Accounting policies describe all significant accounting policies of the reporting entity.",
        "label": "Basis of Presentation and Significant Accounting Policies [Text Block]",
        "terseLabel": "Basis of Presentation and Significant Accounting Policies"
       }
      }
     },
     "localname": "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/BasisOfPresentation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Capital [Abstract]"
       }
      }
     },
     "localname": "CapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CarryingReportedAmountFairValueDisclosureMember": {
     "auth_ref": [
      "r246",
      "r247"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured as reported on the statement of financial position (balance sheet).",
        "label": "Reported Value Measurement [Member]",
        "terseLabel": "Carrying Value [Member]"
       }
      }
     },
     "localname": "CarryingReportedAmountFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "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 increase (decrease) in cash and due from banks"
       }
      }
     },
     "localname": "CashAndCashEquivalentsPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndDueFromBanks": {
     "auth_ref": [
      "r262"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.",
        "label": "Cash and Due from Banks",
        "terseLabel": "Cash and Due from Banks",
        "verboseLabel": "Cash and due from banks"
       }
      }
     },
     "localname": "CashAndDueFromBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r63",
      "r70",
      "r77"
     ],
     "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",
        "periodEndLabel": "Cash and due from banks at end of the period",
        "periodStartLabel": "Cash and due from banks at beginning of the period"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]",
        "verboseLabel": "Noncash investing and financing activities:"
       }
      }
     },
     "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1": {
     "auth_ref": [
      "r229"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.",
        "label": "Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments",
        "verboseLabel": "Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments"
       }
      }
     },
     "localname": "ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1": {
     "auth_ref": [
      "r229"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.",
        "label": "Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge",
        "terseLabel": "Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge"
       }
      }
     },
     "localname": "ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ClassOfStockDomain": {
     "auth_ref": [],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CollateralAlreadyPostedAggregateFairValue": {
     "auth_ref": [
      "r222"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.",
        "label": "Collateral Already Posted, Aggregate Fair Value",
        "terseLabel": "Collateral already posted, aggregate fair value"
       }
      }
     },
     "localname": "CollateralAlreadyPostedAggregateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsAndContingencies": {
     "auth_ref": [
      "r20",
      "r162",
      "r274",
      "r313"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "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",
        "verboseLabel": "Commitments and contingencies (Note 15)"
       }
      }
     },
     "localname": "CommitmentsAndContingencies",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r161",
      "r169"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]",
        "verboseLabel": "Capital Stock Class B Putable [Member]"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockOtherValueOutstanding": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.",
        "label": "Common Stock, Other Value, Outstanding",
        "verboseLabel": "Total capital stock Class B putable"
       }
      }
     },
     "localname": "CommonStockOtherValueOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r8"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common Stock, Par or Stated Value Per Share",
        "terseLabel": "Capital stock Class B putable par value (per share)"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r8"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.",
        "label": "Common Stock, Shares, Issued",
        "verboseLabel": "Capital stock, shares issued"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesOutstanding": {
     "auth_ref": [
      "r8",
      "r181"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.",
        "label": "Common Stock, Shares, Outstanding",
        "verboseLabel": "Capital stock, shares outstanding"
       }
      }
     },
     "localname": "CommonStockSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ComprehensiveIncomeLossNetOfFederalHomeLoanBankAssessmentsAttributableToParent": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in equity after Federal Home Loan Bank (FHLBank) assessments from transactions and other events and circumstances from non-owner sources attributable to the reporting entity. Includes changes in equity except those resulting from investments by owners and distributions to owners. Excludes transactions directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.",
        "label": "Comprehensive Income (Loss), Net of Federal Home Loan Bank Assessments, Attributable to Parent",
        "terseLabel": "Comprehensive income (loss)",
        "totalLabel": "Total comprehensive income"
       }
      }
     },
     "localname": "ComprehensiveIncomeLossNetOfFederalHomeLoanBankAssessmentsAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNoteTextBlock": {
     "auth_ref": [
      "r50"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.",
        "label": "Comprehensive Income (Loss) Note [Text Block]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "ComprehensiveIncomeNoteTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncome"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ConventionalLoanMember": {
     "auth_ref": [
      "r318"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Mortgage loan issued by a bank, which is typically in an amount between 70 to 80 percent of the purchase price of the property securing the loan, has a repayment period of 15 to 30 years, and requires that certain credit criteria be met.",
        "label": "Conventional Mortgage Loan [Member]",
        "verboseLabel": "Conventional Mortgage Loans [Member]"
       }
      }
     },
     "localname": "ConventionalLoanMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails",
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditRiskContractMember": {
     "auth_ref": [
      "r188",
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to the creditworthiness or the credit spread of an entity.",
        "label": "Credit Risk Contract [Member]",
        "terseLabel": "Credit Risk Contract [Member]"
       }
      }
     },
     "localname": "CreditRiskContractMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Disclosure [Abstract]"
       }
      }
     },
     "localname": "DebtDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r177"
     ],
     "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": "Consolidated Obligations"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligations"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r3",
      "r4",
      "r5",
      "r265",
      "r266",
      "r305"
     ],
     "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 [Axis]"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentFaceAmount": {
     "auth_ref": [
      "r250",
      "r252"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of debt instrument at time of issuance.",
        "label": "Debt Instrument, Face Amount",
        "terseLabel": "Bonds par value",
        "totalLabel": "Bonds par value",
        "verboseLabel": "Discount notes par value"
       }
      }
     },
     "localname": "DebtInstrumentFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentFairValue": {
     "auth_ref": [
      "r245"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.",
        "label": "Debt Instrument, Fair Value Disclosure",
        "terseLabel": "Bonds"
       }
      }
     },
     "localname": "DebtInstrumentFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "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 [Line Items]"
       }
      }
     },
     "localname": "DebtInstrumentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r19"
     ],
     "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, Name [Domain]"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentTable": {
     "auth_ref": [
      "r19",
      "r79",
      "r182",
      "r183",
      "r184",
      "r185",
      "r249",
      "r250",
      "r252",
      "r299"
     ],
     "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": "Schedule of Long-term Debt Instruments [Table]"
       }
      }
     },
     "localname": "DebtInstrumentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByCallableFeatureDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedDiscount": {
     "auth_ref": [
      "r249",
      "r252"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 8.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of debt discount.",
        "label": "Debt Instrument, Unamortized Discount",
        "negatedLabel": "Discounts"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedDiscount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentUnamortizedPremium": {
     "auth_ref": [
      "r249",
      "r252"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of debt premium.",
        "label": "Debt Instrument, Unamortized Premium",
        "terseLabel": "Premiums"
       }
      }
     },
     "localname": "DebtInstrumentUnamortizedPremium",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesMember": {
     "auth_ref": [
      "r138"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt instrument issued by corporations, governments and governmental agencies, municipalities, and other institutions.",
        "label": "Debt Securities [Member]",
        "terseLabel": "Debt Securities [Member]"
       }
      }
     },
     "localname": "DebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1": {
     "auth_ref": [
      "r298"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.",
        "label": "Deposit Liabilities Reclassified as Loans Receivable",
        "terseLabel": "Overdrawn demand deposit accounts"
       }
      }
     },
     "localname": "DepositLiabilitiesReclassifiedAsLoansReceivable1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails",
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositsFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.",
        "label": "Deposits, Fair Value Disclosure",
        "terseLabel": "Interest-bearing deposits"
       }
      }
     },
     "localname": "DepositsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepositsWithOtherFederalHomeLoanBanks": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest-bearing funds deposited into another Federal Home Loan Banks (FHLBanks).",
        "label": "Deposits with Other Federal Home Loan Banks",
        "verboseLabel": "Deposits with other FHLBanks"
       }
      }
     },
     "localname": "DepositsWithOtherFederalHomeLoanBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DepreciationAmortizationAndAccretionNet": {
     "auth_ref": [
      "r68"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "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"
       }
      }
     },
     "localname": "DepreciationAmortizationAndAccretionNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset": {
     "auth_ref": [
      "r27",
      "r198"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.",
        "label": "Derivative Asset, Collateral, Obligation to Return Cash, Offset",
        "terseLabel": "Cash collateral received"
       }
      }
     },
     "localname": "DerivativeAssetCollateralObligationToReturnCashOffset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement": {
     "auth_ref": [
      "r26"
     ],
     "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 not subject to a master netting arrangement and elected not to be offset.",
        "label": "Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement",
        "terseLabel": "Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement"
       }
      }
     },
     "localname": "DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset": {
     "auth_ref": [
      "r27",
      "r36",
      "r198"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of liability associated with 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, and obligation to return cash collateral under master netting arrangements.",
        "label": "Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset",
        "terseLabel": "Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset"
       }
      }
     },
     "localname": "DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssets": {
     "auth_ref": [
      "r28",
      "r33",
      "r245"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 10.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "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",
        "verboseLabel": "Derivative assets"
       }
      }
     },
     "localname": "DerivativeAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeCollateralObligationToReturnSecurities": {
     "auth_ref": [
      "r29",
      "r34"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.",
        "label": "Derivative, Collateral, Obligation to Return Securities",
        "terseLabel": "Derivative, Collateral, Obligation to Return Securities"
       }
      }
     },
     "localname": "DerivativeCollateralObligationToReturnSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeCollateralRightToReclaimCash": {
     "auth_ref": [
      "r29",
      "r34",
      "r226"
     ],
     "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": "Derivative, Collateral, Right to Reclaim Cash"
       }
      }
     },
     "localname": "DerivativeCollateralRightToReclaimCash",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeCollateralRightToReclaimSecurities": {
     "auth_ref": [
      "r29",
      "r34"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities.",
        "label": "Derivative, Collateral, Right to Reclaim Securities",
        "terseLabel": "Derivative, Collateral, Right to Reclaim Securities"
       }
      }
     },
     "localname": "DerivativeCollateralRightToReclaimSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "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 Contract [Domain]"
       }
      }
     },
     "localname": "DerivativeContractTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeAsset": {
     "auth_ref": [
      "r26",
      "r35",
      "r206",
      "r259"
     ],
     "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": "Derivative Asset, Fair Value, Gross Asset"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeAsset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral": {
     "auth_ref": [
      "r30",
      "r34",
      "r225"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after effects of master netting arrangements, 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Asset, Fair Value, Amount Offset Against Collateral",
        "terseLabel": "Derivative Asset, Fair Value, Amount Offset Against Collateral"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiability": {
     "auth_ref": [
      "r26",
      "r35",
      "r206",
      "r259"
     ],
     "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"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral": {
     "auth_ref": [
      "r30",
      "r34",
      "r225"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after effects of master netting arrangements, 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 offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Liability, Fair Value, Amount Offset Against Collateral",
        "terseLabel": "Derivative Liability, Fair Value, Amount Offset Against Collateral"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeInstrumentRiskAxis": {
     "auth_ref": [
      "r205",
      "r207",
      "r211",
      "r216"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of derivative contract.",
        "label": "Derivative Instrument [Axis]",
        "terseLabel": "Derivative Instrument Risk [Axis]",
        "verboseLabel": "Derivative Instrument [Axis]"
       }
      }
     },
     "localname": "DerivativeInstrumentRiskAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Derivative Instruments and Hedging Activities Disclosure [Abstract]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock": {
     "auth_ref": [
      "r231"
     ],
     "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]",
        "terseLabel": "Derivatives and Hedging Activities"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivities"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems": {
     "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 and Hedging Activities Disclosures [Line Items]",
        "terseLabel": "Derivative Instruments and Hedging Activities Disclosures [Line Items]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about derivatives and hedging activities.",
        "label": "Derivative Instruments and Hedging Activities Disclosures [Table]",
        "terseLabel": "Derivative Instruments and Hedging Activities Disclosures [Table]"
       }
      }
     },
     "localname": "DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis": {
     "auth_ref": [
      "r202",
      "r205",
      "r211"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of hedging relationship.",
        "label": "Hedging Relationship [Axis]",
        "terseLabel": "Hedging Relationship [Axis]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable": {
     "auth_ref": [
      "r202",
      "r205",
      "r211",
      "r216",
      "r217",
      "r228",
      "r230"
     ],
     "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": "Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "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": "Derivative Instruments, Gain (Loss) [Line Items]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet": {
     "auth_ref": [
      "r210",
      "r212"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.",
        "label": "Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net",
        "terseLabel": "Net gains (losses) on derivatives not designated as hedging instruments"
       }
      }
     },
     "localname": "DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilities": {
     "auth_ref": [
      "r28",
      "r33",
      "r245"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesFairValueDisclosure",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "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 liabilities",
        "verboseLabel": "Derivative liabilities"
       }
      }
     },
     "localname": "DerivativeLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset": {
     "auth_ref": [
      "r27",
      "r198"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.",
        "label": "Derivative Liability, Collateral, Right to Reclaim Cash, Offset",
        "terseLabel": "Cash collateral posted"
       }
      }
     },
     "localname": "DerivativeLiabilityCollateralRightToReclaimCashOffset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset": {
     "auth_ref": [
      "r27",
      "r36",
      "r198"
     ],
     "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, and right to receive cash collateral under master netting arrangements.",
        "label": "Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset",
        "negatedLabel": "Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset"
       }
      }
     },
     "localname": "DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement": {
     "auth_ref": [
      "r26"
     ],
     "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": "Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement"
       }
      }
     },
     "localname": "DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "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 [Line Items]"
       }
      }
     },
     "localname": "DerivativeLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeNetLiabilityPositionAggregateFairValue": {
     "auth_ref": [
      "r221"
     ],
     "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": "Derivative, Net Liability Position, Aggregate Fair Value"
       }
      }
     },
     "localname": "DerivativeNetLiabilityPositionAggregateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeTable": {
     "auth_ref": [
      "r81",
      "r199",
      "r200",
      "r201",
      "r202",
      "r203",
      "r208",
      "r211",
      "r224",
      "r227",
      "r230"
     ],
     "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 [Table]"
       }
      }
     },
     "localname": "DerivativeTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "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 [Line Items]"
       }
      }
     },
     "localname": "DerivativesFairValueLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DesignatedAsHedgingInstrumentMember": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Designated as Hedging Instrument [Member]",
        "terseLabel": "Designated as Hedging Instrument [Member]"
       }
      }
     },
     "localname": "DesignatedAsHedgingInstrumentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DividendsCommonStockCash": {
     "auth_ref": [
      "r186"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.",
        "label": "Dividends, Common Stock, Cash",
        "negatedTerseLabel": "Cash dividends on capital stock",
        "terseLabel": "Dividends, Common Stock, Cash"
       }
      }
     },
     "localname": "DividendsCommonStockCash",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockScheduleOfDeclaredAndPaidQuarterlyDividendsDetails",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r181"
     ],
     "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 [Domain]"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EstimateOfFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r245"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured as an estimate of fair value.",
        "label": "Estimate of Fair Value Measurement [Member]",
        "terseLabel": "Estimate of Fair Value Measurement [Member]"
       }
      }
     },
     "localname": "EstimateOfFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ExchangeClearedMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transaction where an organization acts as an intermediary, reconciling orders between transacting parties.",
        "label": "Exchange Cleared [Member]",
        "terseLabel": "Cleared derivatives [Member]"
       }
      }
     },
     "localname": "ExchangeClearedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "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 Basis [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r232",
      "r233",
      "r234",
      "r241"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain": {
     "auth_ref": [
      "r237"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Class of asset.",
        "label": "Asset Class [Domain]",
        "terseLabel": "Fair Value by Asset Class [Domain]"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward": {
     "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": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]",
        "verboseLabel": "Reconciliation of Available-For-Sale Securities Measured at Fair Value"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "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, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable": {
     "auth_ref": [
      "r237",
      "r241"
     ],
     "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 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.",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]",
        "terseLabel": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock": {
     "auth_ref": [
      "r237",
      "r241"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the fair value measurement of assets 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.",
        "label": "Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]",
        "terseLabel": "Reconciliation of Available-For-Sale Securities Measured at Fair Value"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "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": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]"
       }
      }
     },
     "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByAssetClassAxis": {
     "auth_ref": [
      "r232",
      "r241"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by class of asset.",
        "label": "Asset Class [Axis]",
        "terseLabel": "Asset Class [Axis]"
       }
      }
     },
     "localname": "FairValueByAssetClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTable": {
     "auth_ref": [
      "r232",
      "r246",
      "r247"
     ],
     "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": "Fair Value, by Balance Sheet Grouping [Table]"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTextBlock": {
     "auth_ref": [
      "r232",
      "r246"
     ],
     "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": "Carrying Values and Estimated Fair Values"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r188",
      "r189",
      "r192",
      "r233",
      "r255"
     ],
     "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 and NAV [Axis]"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementBasisAxis": {
     "auth_ref": [
      "r232",
      "r242"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r232",
      "r233",
      "r235",
      "r236",
      "r243"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "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]"
       }
      }
     },
     "localname": "FairValueDisclosureItemAmountsDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.",
        "label": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability",
        "terseLabel": "Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability"
       }
      }
     },
     "localname": "FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "auth_ref": [
      "r240"
     ],
     "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]",
        "terseLabel": "Estimated Fair Values"
       }
      }
     },
     "localname": "FairValueDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValues"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r188",
      "r189",
      "r192",
      "r233",
      "r256"
     ],
     "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 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r188",
      "r189",
      "r192",
      "r233",
      "r257"
     ],
     "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 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r188",
      "r189",
      "r192",
      "r233",
      "r258"
     ],
     "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 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss": {
     "auth_ref": [
      "r238"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)",
        "terseLabel": "Included in other comprehensive income"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements": {
     "auth_ref": [
      "r239"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of settlement of financial instrument classified as an asset 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, Asset, Settlements",
        "negatedTerseLabel": "Settlements"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue": {
     "auth_ref": [
      "r237"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial instrument classified as an asset 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, Asset Value",
        "periodEndLabel": "Balance, end of year",
        "periodStartLabel": "Balance, beginning of year"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [],
     "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 and NAV [Domain]"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r240",
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
        "label": "Fair Value, Recurring [Member]",
        "terseLabel": "Fair Value, Recurring [Member]"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable": {
     "auth_ref": [
      "r204",
      "r208",
      "r228"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalFundsSold": {
     "auth_ref": [
      "r276"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.",
        "label": "Federal Funds Sold",
        "verboseLabel": "Federal funds sold"
       }
      }
     },
     "localname": "FederalFundsSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvances": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.",
        "label": "Federal Home Loan Bank Advances",
        "totalLabel": "Total Federal Home Loan Bank Advances",
        "verboseLabel": "Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvances",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesDiscount": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvances",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unamortized discount on outstanding advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances, Discount",
        "negatedTerseLabel": "Discount on EDGE advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesDiscount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesDiscountOnAffordableHousingProgram": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvances",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unamortized discount on outstanding Affordable Housing Program (AHP) advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances, Discount on Affordable Housing Program",
        "negatedTerseLabel": "Discount on AHP advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesDiscountOnAffordableHousingProgram",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateAfterRollingYearFive": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, after Rolling Year Five",
        "terseLabel": "Due or convertible after five years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateAfterRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInNextRollingTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date within the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Next Rolling Twelve Months",
        "terseLabel": "Due or convertible in one year or less"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInNextRollingTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearFive": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date within the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five",
        "terseLabel": "Due or convertible after four years through five years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date within the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four",
        "terseLabel": "Due or convertible after three years through four years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearThree": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date within the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three",
        "terseLabel": "Due or convertible after two years through three years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearTwo": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with the earlier of contractual maturity or next put or convert date within the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Two",
        "terseLabel": "Due or convertible after one year through two years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesEarlierOfContractualMaturityOrNextPutOrConvertDateInRollingYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFixedRate": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with fixed interest rate.",
        "label": "Federal Home Loan Bank, Advances, Fixed Rate",
        "totalLabel": "Total fixed-rate"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFixedRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFixedRateAfterOneYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesFixedRate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with fixed interest rate maturing more than one year after the latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Fixed Rate, after One Year",
        "terseLabel": "Fixed-rate, due after one year"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFixedRateAfterOneYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFixedRateUnderOneYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesFixedRate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with fixed interest rate maturing within one year of the latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Fixed Rate, under One Year",
        "terseLabel": "Fixed-rate, due in one year or less"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFixedRateUnderOneYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFloatingRate": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with floating interest rate.",
        "label": "Federal Home Loan Bank, Advances, Floating Rate",
        "totalLabel": "Total variable-rate"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFloatingRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFloatingRateAfterOneYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesFloatingRate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with floating interest rate maturing more than one year after the latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Floating Rate, after One Year",
        "terseLabel": "Variable-rate, due after one year"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFloatingRateAfterOneYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesFloatingRateUnderOneYear": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesFloatingRate",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) with floating interest rate maturing within one year after the latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Floating Rate, under One Year",
        "terseLabel": "Variable-rate, due in one year or less"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesFloatingRateUnderOneYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAfterRollingYearFive": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Five",
        "terseLabel": "Due after five years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryAfterRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInNextRollingTwelveMonths": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling Twelve Months",
        "terseLabel": "Due in one year or less"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryInNextRollingTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFive": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Five",
        "terseLabel": "Due after four years through five years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFour": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four",
        "terseLabel": "Due after three years through four years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearThree": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Three",
        "terseLabel": "Due after two years through three years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearTwo": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvancesParValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Two",
        "terseLabel": "Due after one year through two years"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesParValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvances",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Par amount of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances, Par Value",
        "terseLabel": "Federal Home Loan Bank, Advances, Par Value",
        "totalLabel": "Federal Home Loan Bank, Advances, Par Value"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesParValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesByYearOfContractualMaturityForConvertibleAdvancesDetails",
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/AdvancesInterestRatePaymentTermsDetails",
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances [Table Text Block]",
        "verboseLabel": "Federal Home Loan Bank, Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesTextBlock": {
     "auth_ref": [
      "r304"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of advances made and reported by Federal Home Loan Bank (FHLBank).",
        "label": "Federal Home Loan Bank, Advances [Text Block]",
        "terseLabel": "Advances"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/Advances"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FederalHomeLoanBankAdvancesValuationAdjustmentsForHedgingActivities": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_FederalHomeLoanBankAdvances",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated increase (decrease) on advances made and reported by Federal Home Loan Bank (FHLBank) from hedging adjustments.",
        "label": "Federal Home Loan Bank, Advances, Valuation Adjustments for Hedging Activities",
        "terseLabel": "Hedging adjustments"
       }
      }
     },
     "localname": "FederalHomeLoanBankAdvancesValuationAdjustmentsForHedgingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AdvancesAdvancesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankConsolidatedObligations": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of joint and several obligations consisting of consolidated obligation bonds and discount notes issued by Federal Home Loan Banks (FHLBanks).",
        "label": "Federal Home Loan Bank, Consolidated Obligations",
        "totalLabel": "Total consolidated obligations, net"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankConsolidatedObligationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Federal Home Loan Bank, Consolidated Obligations [Abstract]",
        "verboseLabel": "Consolidated obligations, net:"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligationsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligations",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of joint and several obligations consisting of bonds issued by Federal Home Loan Banks (FHLBanks).",
        "label": "Federal Home Loan Bank, Consolidated Obligations, Bonds",
        "totalLabel": "Federal Home Loan Bank, Consolidated Obligations, Bonds",
        "verboseLabel": "Bonds"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligationsBonds",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankConsolidatedObligationsDiscountNotes": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligations",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of joint and several obligations consisting of discount notes issued by Federal Home Loan Banks (FHLBanks).",
        "label": "Federal Home Loan Bank, Consolidated Obligations, Discount Notes",
        "terseLabel": "Discount notes"
       }
      }
     },
     "localname": "FederalHomeLoanBankConsolidatedObligationsDiscountNotes",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankLeverageCapitalActual": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of leveraged capital of Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Leverage Capital, Actual",
        "terseLabel": "Leverage capital, Actual"
       }
      }
     },
     "localname": "FederalHomeLoanBankLeverageCapitalActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankLeverageCapitalRequired": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum amount of leverage capital required for Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Leverage Capital, Required",
        "terseLabel": "Leverage capital, Required"
       }
      }
     },
     "localname": "FederalHomeLoanBankLeverageCapitalRequired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankLeverageRatioActual1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Leverage ratio of Federal Home Loan Bank (FHLBank), calculated per regulations of the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Leverage Ratio, Actual",
        "terseLabel": "Leverage capital ratio, Actual"
       }
      }
     },
     "localname": "FederalHomeLoanBankLeverageRatioActual1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankRegulatoryCapitalActual": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of regulatory capital of Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Regulatory Capital, Actual",
        "terseLabel": "Total regulatory capital, Actual",
        "verboseLabel": "Regulatory Capital Stock Outstanding"
       }
      }
     },
     "localname": "FederalHomeLoanBankRegulatoryCapitalActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails",
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankRegulatoryCapitalRatioActual": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Regulatory capital ratio of Federal Home Loan Bank (FHLBank), calculated per regulations of the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Regulatory Capital Ratio, Actual",
        "terseLabel": "Total regulatory capital ratio, Actual"
       }
      }
     },
     "localname": "FederalHomeLoanBankRegulatoryCapitalRatioActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FederalHomeLoanBankRegulatoryCapitalRequired": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum amount of regulatory capital required for Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Regulatory Capital, Required",
        "terseLabel": "Total regulatory capital, Required"
       }
      }
     },
     "localname": "FederalHomeLoanBankRegulatoryCapitalRequired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankRiskBasedCapitalActual": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of risk-based capital of Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Risk-Based Capital, Actual",
        "terseLabel": "Risk-based capital, Actual"
       }
      }
     },
     "localname": "FederalHomeLoanBankRiskBasedCapitalActual",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FederalHomeLoanBankRiskBasedCapitalRequired": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum amount of risk-based capital required for Federal Home Loan Bank (FHLBank), set by the Federal Housing Finance Agency (FHFA).",
        "label": "Federal Home Loan Bank, Risk-Based Capital, Required",
        "terseLabel": "Risk-based capital, Required"
       }
      }
     },
     "localname": "FederalHomeLoanBankRiskBasedCapitalRequired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockRegulatoryCapitalRulesAndRequirementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialInstrumentAxis": {
     "auth_ref": [
      "r140",
      "r142",
      "r143",
      "r146",
      "r148",
      "r155",
      "r156",
      "r157",
      "r158"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of financial instrument.",
        "label": "Financial Instrument [Axis]",
        "verboseLabel": "Financial Instrument [Axis]"
       }
      }
     },
     "localname": "FinancialInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFive": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of mandatorily redeemable capital stock maturing in year five following the date of the latest balance sheet.",
        "label": "Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Five",
        "terseLabel": "Due after four years through five years"
       }
      }
     },
     "localname": "FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockByYearOfRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFour": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of mandatorily redeemable capital stock maturing in year four following the date of the latest balance sheet.",
        "label": "Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Four",
        "terseLabel": "Due after three years through four years"
       }
      }
     },
     "localname": "FinancialInstrumentsSubjectToMandatoryRedemptionRedeemableInYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockByYearOfRedemptionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment": {
     "auth_ref": [
      "r90"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LoansAndLeasesReceivableAllowance",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.",
        "label": "Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment",
        "terseLabel": "Allowance for credit losses, collectively evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems": {
     "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": "Financing Receivable, Allowance for Credit Loss [Line Items]",
        "terseLabel": "Financing Receivable, Allowance for Credit Loss [Line Items]"
       }
      }
     },
     "localname": "FinancingReceivableAllowanceForCreditLossesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment": {
     "auth_ref": [
      "r91"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_NotesReceivableGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The balance of financing receivables that were collectively evaluated for impairment.",
        "label": "Financing Receivable, Collectively Evaluated for Impairment",
        "terseLabel": "Recorded investment, collectively evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableCollectivelyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment": {
     "auth_ref": [
      "r91"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_NotesReceivableGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The balance of financing receivables that were individually evaluated for impairment.",
        "label": "Financing Receivable, Individually Evaluated for Impairment",
        "terseLabel": "Recorded investment, individually evaluated for impairment"
       }
      }
     },
     "localname": "FinancingReceivableIndividuallyEvaluatedForImpairment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivablePortfolioSegmentAxis": {
     "auth_ref": [
      "r140",
      "r142",
      "r149"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.",
        "label": "Financing Receivable Portfolio Segment [Axis]",
        "terseLabel": "Financing Receivable Portfolio Segment [Axis]"
       }
      }
     },
     "localname": "FinancingReceivablePortfolioSegmentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivablePortfolioSegmentDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses.",
        "label": "Financing Receivable Portfolio Segment [Domain]",
        "terseLabel": "Financing Receivable Portfolio Segment [Domain]"
       }
      }
     },
     "localname": "FinancingReceivablePortfolioSegmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing": {
     "auth_ref": [
      "r96",
      "r145",
      "r153"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of financing receivable 90 days or more past due and still accruing.",
        "label": "Financing Receivable, 90 Days or More Past Due, Still Accruing",
        "terseLabel": "Past due 90 days or more and still accruing interest"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis": {
     "auth_ref": [
      "r93",
      "r97",
      "r98",
      "r143",
      "r146",
      "r148",
      "r150",
      "r151",
      "r152",
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by class of financing receivable determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
        "label": "Class of Financing Receivable [Axis]",
        "terseLabel": "Portfolio Segment [Axis]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financing receivables determined on the basis of initial measurement attribute, risk characteristics and method of monitoring and assessing credit risk.",
        "label": "Class of Financing Receivable [Domain]",
        "terseLabel": "Financing Receivable Allowance [Domain]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentCurrent": {
     "auth_ref": [
      "r143",
      "r153"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_NotesReceivableGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of financing receivable not past due.",
        "label": "Financing Receivable, Not Past Due",
        "terseLabel": "Total current mortgage loans"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentLineItems": {
     "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": "Financing Receivable, Credit Quality Indicator [Line Items]",
        "terseLabel": "Financing Receivable, Credit Quality Indicator [Line Items]"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus": {
     "auth_ref": [
      "r95",
      "r144"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of financing receivable on nonaccrual status.",
        "label": "Financing Receivable, Nonaccrual",
        "terseLabel": "Loans on nonaccrual status"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentNonaccrualStatus",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivableRecordedInvestmentPastDue": {
     "auth_ref": [
      "r98",
      "r143",
      "r153"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_NotesReceivableGross",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of financing receivable past due.",
        "label": "Financing Receivable, Past Due",
        "terseLabel": "Total past due mortgage loans"
       }
      }
     },
     "localname": "FinancingReceivableRecordedInvestmentPastDue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancingReceivables30To59DaysPastDueMember": {
     "auth_ref": [
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial asset more than 29 days past due but fewer than 60 days past due.",
        "label": "Financial Asset, 30 to 59 Days Past Due [Member]",
        "terseLabel": "Financial Asset, 30 to 59 Days Past Due [Member]"
       }
      }
     },
     "localname": "FinancingReceivables30To59DaysPastDueMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivables60To89DaysPastDueMember": {
     "auth_ref": [
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial asset more than 59 days past due but fewer than 90 days past due.",
        "label": "Financial Asset, 60 to 89 Days Past Due [Member]",
        "terseLabel": "Financial Asset, 60 to 89 Days Past Due [Member]"
       }
      }
     },
     "localname": "FinancingReceivables60To89DaysPastDueMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember": {
     "auth_ref": [
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial asset equal to or greater than 90 days past due.",
        "label": "Financial Asset, Equal to or Greater than 90 Days Past Due [Member]",
        "terseLabel": "Financial Asset, Equal to or Greater than 90 Days Past Due [Member]"
       }
      }
     },
     "localname": "FinancingReceivablesEqualToGreaterThan90DaysPastDueMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivablesPeriodPastDueAxis": {
     "auth_ref": [
      "r143",
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by time period financial asset is past due.",
        "label": "Financial Asset, Period Past Due [Axis]",
        "terseLabel": "Financial Asset, Period Past Due [Axis]"
       }
      }
     },
     "localname": "FinancingReceivablesPeriodPastDueAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinancingReceivablesPeriodPastDueDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period in which financial asset is past due. Element name and standard label in Financial Asset, [numeric lower end] to [numeric higher end] [date measure] Past Due [Member] or Financial Asset, Greater Than [low end numeric value] [date measure] Past Due [Member] or Financial Asset, Less Than [high end numeric value] [date measure] Past Due [Member] formats.",
        "label": "Financial Asset, Period Past Due [Domain]",
        "terseLabel": "Financial Asset, Period Past Due [Domain]"
       }
      }
     },
     "localname": "FinancingReceivablesPeriodPastDueDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinancingReceivablesTextBlock": {
     "auth_ref": [
      "r101",
      "r102"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for financing receivable.",
        "label": "Financing Receivables [Text Block]",
        "terseLabel": "Mortgage Loans Held for Portfolio"
       }
      }
     },
     "localname": "FinancingReceivablesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolio"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GainLossOnDerivativeInstrumentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing gain (loss) on derivative instruments.",
        "label": "Gain (Loss) on Derivative Instruments [Member]",
        "terseLabel": "Gain (Loss) on Derivative Instruments [Member]"
       }
      }
     },
     "localname": "GainLossOnDerivativeInstrumentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainLossOnDerivativeInstrumentsNetPretax": {
     "auth_ref": [
      "r205"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.",
        "label": "Gain (Loss) on Derivative Instruments, Net, Pretax",
        "terseLabel": "Gain (Loss) on Derivative Instruments, Net, Pretax",
        "verboseLabel": "Net (losses) gains on derivatives and hedging activities"
       }
      }
     },
     "localname": "GainLossOnDerivativeInstrumentsNetPretax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnFairValueHedgeIneffectivenessNet": {
     "auth_ref": [
      "r229"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.",
        "label": "Gain (Loss) on Fair Value Hedge Ineffectiveness, Net",
        "terseLabel": "Net gains on derivatives and hedged items in fair value hedging relationships",
        "verboseLabel": "Gain (Loss) on Fair Value Hedge Ineffectiveness, Net"
       }
      }
     },
     "localname": "GainLossOnFairValueHedgeIneffectivenessNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnInvestmentsTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of realized and unrealized gain (loss) on investment in security.",
        "label": "Gain (Loss) on Securities [Table Text Block]",
        "verboseLabel": "Schedule of Net Losses on Trading Securities"
       }
      }
     },
     "localname": "GainLossOnInvestmentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [
      "r220"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.",
        "label": "Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgedAssetFairValueHedge": {
     "auth_ref": [
      "r218"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset hedged in fair value hedging relationship.",
        "label": "Hedged Asset, Fair Value Hedge",
        "terseLabel": "Hedged Asset, Fair Value Hedge"
       }
      }
     },
     "localname": "HedgedAssetFairValueHedge",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [
      "r219"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.",
        "label": "Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedAssetFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [
      "r220"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge.",
        "label": "Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgedLiabilityFairValueHedge": {
     "auth_ref": [
      "r218"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liability hedged in fair value hedging relationship.",
        "label": "Hedged Liability, Fair Value Hedge",
        "terseLabel": "Hedged Liability, Fair Value Hedge"
       }
      }
     },
     "localname": "HedgedLiabilityFairValueHedge",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease": {
     "auth_ref": [
      "r219"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.",
        "label": "Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)",
        "terseLabel": "Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)"
       }
      }
     },
     "localname": "HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgingDesignationAxis": {
     "auth_ref": [
      "r202",
      "r217"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Axis]",
        "terseLabel": "Hedging Designation [Axis]"
       }
      }
     },
     "localname": "HedgingDesignationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_HedgingDesignationDomain": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Domain]",
        "terseLabel": "Hedging Designation [Domain]"
       }
      }
     },
     "localname": "HedgingDesignationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_HedgingRelationshipDomain": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nature or intent of a hedge.",
        "label": "Hedging Relationship [Domain]",
        "terseLabel": "Hedging Relationship [Domain]"
       }
      }
     },
     "localname": "HedgingRelationshipDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_HeldToMaturitySecurities": {
     "auth_ref": [
      "r105",
      "r118"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_MarketableSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity",
        "terseLabel": "Held-to-maturity securities",
        "verboseLabel": "Held-to-maturity securities (fair value of $25,846 and $23,846 as of June 30, 2019 and December 31, 2018, respectively)"
       }
      }
     },
     "localname": "HeldToMaturitySecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain": {
     "auth_ref": [
      "r120"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain",
        "terseLabel": "Held-to-maturity securities, Gross Unrealized Gains"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss": {
     "auth_ref": [
      "r121"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss",
        "negatedTerseLabel": "Held-to-maturity securities, Gross Unrealized Loss"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment",
        "totalLabel": "Amortized cost of held-to-maturity securities",
        "verboseLabel": "Amortized cost of held-to-maturity securities"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesClassifiedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Held-to-maturity [Abstract]"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesClassifiedAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": {
     "auth_ref": [
      "r125",
      "r128"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.",
        "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
        "negatedTerseLabel": "Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss": {
     "auth_ref": [
      "r125"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.",
        "label": "Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss",
        "negatedTotalLabel": "Total gross unrealized loss"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue": {
     "auth_ref": [
      "r124"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.",
        "label": "Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value",
        "totalLabel": "Total estimated fair value of positions in an unrealized loss"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": {
     "auth_ref": [
      "r125",
      "r128"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.",
        "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
        "negatedTerseLabel": "Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": {
     "auth_ref": [
      "r128"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.",
        "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value",
        "verboseLabel": "Estimated fair value of unrealized loss positions held less than 12 months"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue": {
     "auth_ref": [
      "r128"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.",
        "label": "Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value",
        "verboseLabel": "Estimated fair value of unrealized loss positions held 12 months or more"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount": {
     "auth_ref": [
      "r122",
      "r296"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost",
        "terseLabel": "Estimated fair value of held-to-maturity securities due after five years through ten years"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value",
        "terseLabel": "Estimated fair value of held-to-maturity securities due in one year or less"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value",
        "terseLabel": "Due after 10 years"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value",
        "terseLabel": "Estimated fair value of held-to-maturity securities due after one year through five years"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesFairValue": {
     "auth_ref": [
      "r119"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity, Fair Value",
        "terseLabel": "Held-to-maturity securities, fair value",
        "totalLabel": "Estimated fair value of held-to-maturity securities",
        "verboseLabel": "Held-to-maturity securities, fair value"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions": {
     "auth_ref": [
      "r126"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.",
        "label": "Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions",
        "totalLabel": "Total number of unrealized loss positions"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "decimalItemType"
    },
    "us-gaap_HeldToMaturitySecuritiesTextBlock": {
     "auth_ref": [
      "r123"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity [Table Text Block]",
        "verboseLabel": "Schedule of Held-to-Maturity Securities"
       }
      }
     },
     "localname": "HeldToMaturitySecuritiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost",
        "terseLabel": "Amortized cost of held-to-maturity securities due in one year or less"
       }
      }
     },
     "localname": "HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost",
        "terseLabel": "Due after 10 years"
       }
      }
     },
     "localname": "HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost",
        "terseLabel": "Amortized cost of held-to-maturity securities due after five years through ten years"
       }
      }
     },
     "localname": "HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost",
        "terseLabel": "Amortized cost of held-to-maturity securities due after one year through five years"
       }
      }
     },
     "localname": "HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HeldtomaturitySecuritiesMember": {
     "auth_ref": [
      "r135"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments in debt securities classified as held-to-maturity.",
        "label": "Held-to-maturity Securities [Member]",
        "terseLabel": "Held-to-maturity Securities [Member]"
       }
      }
     },
     "localname": "HeldtomaturitySecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ImpairmentOfInvestments": {
     "auth_ref": [
      "r108"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.",
        "label": "Other than Temporary Impairment Losses, Investments",
        "terseLabel": "Total other-than-temporary impairment losses"
       }
      }
     },
     "localname": "ImpairmentOfInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": {
     "auth_ref": [
      "r80"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.",
        "label": "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest",
        "totalLabel": "Income before assessment"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "auth_ref": [
      "r160"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet": {
     "auth_ref": [
      "r67"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.",
        "label": "Increase (Decrease) in Accrued Interest Receivable, Net",
        "negatedLabel": "Accrued interest receivable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedInterestReceivableNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInDeposits": {
     "auth_ref": [
      "r71",
      "r293"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.",
        "label": "Increase (Decrease) in Deposits",
        "verboseLabel": "Net change in interest-bearing deposits"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeposits",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInFederalFundsSold": {
     "auth_ref": [
      "r63",
      "r66",
      "r292"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest.",
        "label": "Increase (Decrease) in Federal Funds Sold",
        "verboseLabel": "Federal funds sold"
       }
      }
     },
     "localname": "IncreaseDecreaseInFederalFundsSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInterestPayableNet": {
     "auth_ref": [
      "r67"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "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",
        "verboseLabel": "Accrued interest payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInInterestPayableNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInLoansToFederalHomeLoanBanks": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in Federal Home Loan Bank (FHLBank) loans to another FHLBank.",
        "label": "Increase (Decrease) in Loans to Federal Home Loan Banks",
        "negatedLabel": "Loan to another FHLBank"
       }
      }
     },
     "localname": "IncreaseDecreaseInLoansToFederalHomeLoanBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Increase (Decrease) in Operating Capital [Abstract]",
        "verboseLabel": "Net change in:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingAssets": {
     "auth_ref": [
      "r67"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating assets classified as other.",
        "label": "Increase (Decrease) in Other Operating Assets",
        "negatedLabel": "Other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherOperatingAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities": {
     "auth_ref": [
      "r67"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating liabilities classified as other.",
        "label": "Increase (Decrease) in Other Operating Liabilities",
        "verboseLabel": "Other liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherOperatingLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward": {
     "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": "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
        "terseLabel": "Increase (Decrease) in Stockholders' Equity [Roll Forward]"
       }
      }
     },
     "localname": "IncreaseDecreaseInStockholdersEquityRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InformationByCategoryOfDebtSecurityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by category of debt security, either available-for-sale or held-to-maturity.",
        "label": "Debt Security Category [Axis]",
        "terseLabel": "Debt Security Category [Axis]"
       }
      }
     },
     "localname": "InformationByCategoryOfDebtSecurityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables",
      "http://www.fhlbatl.com/role/TradingSecuritiesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestAndDividendIncomeOperating": {
     "auth_ref": [
      "r283"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_InterestIncomeExpenseNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.",
        "label": "Interest and Dividend Income, Operating",
        "totalLabel": "Total interest income"
       }
      }
     },
     "localname": "InterestAndDividendIncomeOperating",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndDividendIncomeOperatingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Interest and Dividend Income, Operating [Abstract]",
        "verboseLabel": "Interest income"
       }
      }
     },
     "localname": "InterestAndDividendIncomeOperatingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.",
        "label": "Interest and Dividend Income, Securities, Operating, Available-for-sale",
        "verboseLabel": "Available-for-sale securities"
       }
      }
     },
     "localname": "InterestAndDividendIncomeSecuritiesAvailableForSale",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities.",
        "label": "Interest Income, Debt Securities, Held-to-maturity",
        "verboseLabel": "Held-to-maturity securities"
       }
      }
     },
     "localname": "InterestAndDividendIncomeSecuritiesHeldToMaturity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on trading securities and other forms of securities that provide ownership interests.",
        "label": "Interest and Dividend Income, Securities, Operating, Trading or Measured at Fair Value",
        "verboseLabel": "Trading securities"
       }
      }
     },
     "localname": "InterestAndDividendIncomeSecuritiesTradingOrMeasuredAtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestAndFeeIncomeLoansConsumerRealEstate": {
     "auth_ref": [
      "r282"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and fee income generated from loans secured by one- to four-family residential properties. This item excludes home equity lines-of-credit.",
        "label": "Interest and Fee Income, Loans, Consumer, Real Estate",
        "verboseLabel": "Mortgage loans"
       }
      }
     },
     "localname": "InterestAndFeeIncomeLoansConsumerRealEstate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDepositLiabilitiesDomestic": {
     "auth_ref": [
      "r271"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits.",
        "label": "Interest-bearing Deposit Liabilities, Domestic",
        "verboseLabel": "Interest-bearing deposits"
       }
      }
     },
     "localname": "InterestBearingDepositLiabilitiesDomestic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDepositsInBanks": {
     "auth_ref": [
      "r261",
      "r275"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.",
        "label": "Interest-bearing Deposits in Banks and Other Financial Institutions",
        "verboseLabel": "Interest-bearing deposits (including deposits with other FHLBanks of $5 and $20 as of June 30, 2019 and December 31, 2018, respectively)"
       }
      }
     },
     "localname": "InterestBearingDepositsInBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestBearingDomesticDepositDemand": {
     "auth_ref": [
      "r271"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of money in interest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.",
        "label": "Interest-bearing Domestic Deposit, Demand",
        "terseLabel": "Interest-bearing Deposits"
       }
      }
     },
     "localname": "InterestBearingDomesticDepositDemand",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TransactionsWithShareholdersDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r47",
      "r86",
      "r248",
      "r251",
      "r291"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_InterestIncomeExpenseNet",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.",
        "label": "Interest Expense",
        "totalLabel": "Total interest expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InterestExpenseDomesticDeposits": {
     "auth_ref": [
      "r288"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_InterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate interest expense incurred on all domestic deposits.",
        "label": "Interest Expense, Domestic Deposits",
        "terseLabel": "Interest-bearing deposits"
       }
      }
     },
     "localname": "InterestExpenseDomesticDeposits",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseMember": {
     "auth_ref": [
      "r215"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing interest expense.",
        "label": "Interest Expense [Member]",
        "terseLabel": "Interest Expense [Member]"
       }
      }
     },
     "localname": "InterestExpenseMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestExpenseOtherLongTermDebt": {
     "auth_ref": [
      "r290"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_InterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest expense incurred on long-term debt classified as other, including, but not limited to, interest on long-term notes and amortization of issuance costs.",
        "label": "Interest Expense, Other Long-term Debt",
        "negatedTerseLabel": "Interest Expense, Other Long-term Debt",
        "verboseLabel": "Consolidated obligation bonds"
       }
      }
     },
     "localname": "InterestExpenseOtherLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseOtherShortTermBorrowings": {
     "auth_ref": [
      "r289"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_InterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest expense incurred during the reporting period on other short-term borrowings.",
        "label": "Interest Expense, Other Short-term Borrowings",
        "verboseLabel": "Consolidated obligation discount notes"
       }
      }
     },
     "localname": "InterestExpenseOtherShortTermBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeDepositsWithFinancialInstitutions": {
     "auth_ref": [
      "r287"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.",
        "label": "Interest Income, Deposits with Financial Institutions",
        "verboseLabel": "Interest-bearing deposits"
       }
      }
     },
     "localname": "InterestIncomeDepositsWithFinancialInstitutions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeExpenseNet": {
     "auth_ref": [
      "r284"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net amount of operating interest income (expense).",
        "label": "Interest Income (Expense), Net",
        "totalLabel": "Net interest income"
       }
      }
     },
     "localname": "InterestIncomeExpenseNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeFederalFundsSold": {
     "auth_ref": [
      "r287"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).",
        "label": "Interest Income, Federal Funds Sold",
        "verboseLabel": "Federal funds sold"
       }
      }
     },
     "localname": "InterestIncomeFederalFundsSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeFederalHomeLoanBankAdvances": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest income from Federal Home Loan Bank (FHLBank) advances to member financial institutions.",
        "label": "Interest Income, Federal Home Loan Bank Advances",
        "terseLabel": "Interest Income, Federal Home Loan Bank Advances",
        "verboseLabel": "Advances"
       }
      }
     },
     "localname": "InterestIncomeFederalHomeLoanBankAdvances",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption in which reported facts about interest income have been included.",
        "label": "Interest Income [Member]",
        "terseLabel": "Interest Income [Member]"
       }
      }
     },
     "localname": "InterestIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestIncomeSecuritiesPurchasedUnderAgreementsToResell": {
     "auth_ref": [
      "r287"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest income derived from securities purchased under agreements to resell. The difference in the price at which the institution buys the securities and resells the securities represents interest for the use of the funds by the other party. Most repurchase and sale agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances and negotiable certificates of deposits are sometimes used in such transactions.",
        "label": "Interest Income, Securities Purchased under Agreements to Resell",
        "terseLabel": "Securities purchased under agreements to resell"
       }
      }
     },
     "localname": "InterestIncomeSecuritiesPurchasedUnderAgreementsToResell",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaidNet": {
     "auth_ref": [
      "r62",
      "r64",
      "r73"
     ],
     "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",
        "verboseLabel": "Interest"
       }
      }
     },
     "localname": "InterestPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPayableCurrentAndNoncurrent": {
     "auth_ref": [
      "r272",
      "r314"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest payable on debt, including, but not limited to, trade payables.",
        "label": "Interest Payable",
        "terseLabel": "Interest Payable",
        "verboseLabel": "Accrued interest payable"
       }
      }
     },
     "localname": "InterestPayableCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateContractMember": {
     "auth_ref": [
      "r188",
      "r213"
     ],
     "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 [Member]"
       }
      }
     },
     "localname": "InterestRateContractMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestRateSwapMember": {
     "auth_ref": [
      "r213"
     ],
     "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 swaps [Member]",
        "verboseLabel": "Interest rate swap [Member]"
       }
      }
     },
     "localname": "InterestRateSwapMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNarrativeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnDerivativesAndHedgingActivitiesRecordedInNonInterestIncomeDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InterestReceivable": {
     "auth_ref": [
      "r23"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.",
        "label": "Interest Receivable",
        "terseLabel": "Interest Receivable",
        "verboseLabel": "Accrued interest receivable"
       }
      }
     },
     "localname": "InterestReceivable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.",
        "label": "Investments Classified by Contractual Maturity Date [Table Text Block]",
        "terseLabel": "Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities by Contractual Maturity"
       }
      }
     },
     "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LaborAndRelatedExpense": {
     "auth_ref": [
      "r48"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.",
        "label": "Labor and Related Expense",
        "verboseLabel": "Compensation and benefits"
       }
      }
     },
     "localname": "LaborAndRelatedExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r18"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "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",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities [Abstract]",
        "verboseLabel": "Liabilities"
       }
      }
     },
     "localname": "LiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r14",
      "r267",
      "r311"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
        "label": "Liabilities and Equity",
        "totalLabel": "Total liabilities and capital"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesFairValueDisclosure": {
     "auth_ref": [
      "r232"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails": {
       "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 recurring liabilities at fair value"
       }
      }
     },
     "localname": "LiabilitiesFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoanOriginationCommitmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commitments to borrowers or third party investors for the origination of a loan.",
        "label": "Loan Origination Commitments [Member]",
        "terseLabel": "Commitments to Fund Additional Advances [Member]"
       }
      }
     },
     "localname": "LoanOriginationCommitmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoansAndLeasesReceivableAllowance": {
     "auth_ref": [
      "r89",
      "r90",
      "r100",
      "r103",
      "r278"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.",
        "label": "Loans and Leases Receivable, Allowance",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period",
        "terseLabel": "Allowance for credit losses on mortgage loans",
        "totalLabel": "Total allowance for credit losses"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableAllowance",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansAndLeasesReceivableNetReportedAmount": {
     "auth_ref": [
      "r88",
      "r279"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.",
        "label": "Loans and Leases Receivable, Net Amount",
        "netLabel": "Mortgage loans held for portfolio, net of allowance for credit losses of $1 as of June 30, 2019 and December 31, 2018"
       }
      }
     },
     "localname": "LoansAndLeasesReceivableNetReportedAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by US and non-US government sponsored enterprise, authority, agency and program guarantees for government insured loans.",
        "label": "Loans Insured or Guaranteed by Government Authorities [Axis]",
        "terseLabel": "Loans Insured or Guaranteed by Government Authorities [Axis]"
       }
      }
     },
     "localname": "LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Guarantee by US and non-US government sponsored enterprises, authorities, agencies and programs for government insured loans.",
        "label": "Loans Insured or Guaranteed by Government Authorities [Domain]",
        "terseLabel": "Loans Insured or Guaranteed by Government Authorities [Domain]"
       }
      }
     },
     "localname": "LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoansReceivableFairValueDisclosure": {
     "auth_ref": [
      "r101"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.",
        "label": "Loans Receivable, Fair Value Disclosure",
        "terseLabel": "Mortgage loans held for portfolio, net"
       }
      }
     },
     "localname": "LoansReceivableFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LoansToOtherFederalHomeLoanBanks": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of Federal Home Loan Bank (FHLBank) loans to another FHLBank.",
        "label": "Loans to Other Federal Home Loan Banks",
        "terseLabel": "Loan to another FHLBank"
       }
      }
     },
     "localname": "LoansToOtherFederalHomeLoanBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months",
        "terseLabel": "Bonds, Due in one year or less"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_DebtInstrumentFaceAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five",
        "terseLabel": "Bonds, Due after five years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_DebtInstrumentFaceAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five",
        "terseLabel": "Bonds, Due after four years through five years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four",
        "terseLabel": "Bonds, Due after three years through four years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_FederalHomeLoanBankConsolidatedObligationsBonds",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three",
        "terseLabel": "Bonds, Due after two years through three years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_DebtInstrumentFaceAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two",
        "terseLabel": "Bonds, Due after one year through two years"
       }
      }
     },
     "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsBondsByMaturityOrCallDateDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "auth_ref": [
      "r19"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-term debt.",
        "label": "Long-term Debt, Type [Axis]",
        "terseLabel": "Long-term Debt, Type [Axis]"
       }
      }
     },
     "localname": "LongtermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "auth_ref": [
      "r19",
      "r175"
     ],
     "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, Type [Domain]"
       }
      }
     },
     "localname": "LongtermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongtermDebtWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of long-term debt outstanding calculated at point in time.",
        "label": "Long-term Debt, Weighted Average Interest Rate, at Point in Time",
        "terseLabel": "Total, weighted average interest rate"
       }
      }
     },
     "localname": "LongtermDebtWeightedAverageInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsRedemptionTermsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LossContingenciesByNatureOfContingencyAxis": {
     "auth_ref": [
      "r162",
      "r163",
      "r164",
      "r165",
      "r166",
      "r167",
      "r168",
      "r171",
      "r172"
     ],
     "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": "Loss Contingency Nature [Axis]"
       }
      }
     },
     "localname": "LossContingenciesByNatureOfContingencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "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": "Loss Contingencies [Line Items]"
       }
      }
     },
     "localname": "LossContingenciesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesTable": {
     "auth_ref": [
      "r162",
      "r163",
      "r164",
      "r165",
      "r166",
      "r167",
      "r168",
      "r171",
      "r172"
     ],
     "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": "Loss Contingencies [Table]"
       }
      }
     },
     "localname": "LossContingenciesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingencyNatureDomain": {
     "auth_ref": [
      "r162",
      "r163",
      "r164",
      "r165",
      "r166",
      "r167",
      "r168",
      "r171",
      "r172"
     ],
     "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": "Loss Contingency, Nature [Domain]"
       }
      }
     },
     "localname": "LossContingencyNatureDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MarketableSecurities": {
     "auth_ref": [
      "r277"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in marketable security.",
        "label": "Marketable Securities",
        "totalLabel": "Total investment securities"
       }
      }
     },
     "localname": "MarketableSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MarketableSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Marketable Securities [Abstract]",
        "terseLabel": "Investment securities:"
       }
      }
     },
     "localname": "MarketableSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember": {
     "auth_ref": [
      "r110",
      "r188"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt securities collateralized by real estate mortgage loans (mortgages), issued by non-governmental sponsored enterprises.",
        "label": "Mortgage-backed Securities, Issued by Private Enterprises [Member]",
        "terseLabel": "Mortgage-backed Securities, Issued by Private Enterprises [Member]",
        "verboseLabel": "Mortgage-backed Securities, Private-label residential [Member]"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails",
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember": {
     "auth_ref": [
      "r188"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt securities collateralized by real estate mortgage loans (mortgages), issued by US Government Sponsored Enterprises, such as Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac).",
        "label": "Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]",
        "verboseLabel": "Government-sponsored enterprises"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MortgageBackedSecuritiesMember": {
     "auth_ref": [
      "r110",
      "r188",
      "r189",
      "r192",
      "r316"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by mortgage loans.",
        "label": "Collateralized Mortgage Backed Securities [Member]",
        "terseLabel": "Mortgage-backed securities [Member]"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_MortgageLoansInProcessOfForeclosureAmount": {
     "auth_ref": [
      "r94"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.",
        "label": "Mortgage Loans in Process of Foreclosure, Amount",
        "terseLabel": "In process of foreclosure"
       }
      }
     },
     "localname": "MortgageLoansInProcessOfForeclosureAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r63"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease",
       "weight": 1.0
      }
     },
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]",
        "verboseLabel": "Financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r63"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease",
       "weight": 1.0
      }
     },
     "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 provided by (used in) investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]",
        "verboseLabel": "Investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r63",
      "r65",
      "r69"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease",
       "weight": 1.0
      }
     },
     "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 (used in) provided by operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Operating Activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeLossNetOfFederalHomeLoanBankAssessmentsAttributableToParent",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of profit (loss) after Federal Home Loan Bank (FHLBank) assessments attributable to the parent.",
        "label": "Net Income (Loss) Attributable to Parent, Net of Federal Home Loan Bank Assessments",
        "totalLabel": "Net income",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToParentNetOfFederalHomeLoanBankAssessments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The sum of the realized and unrealized net gain (loss) on trading securities during the period.",
        "label": "Net Realized and Unrealized Gain (Loss) on Trading Securities",
        "negatedLabel": "Net change in fair value adjustments on trading securities",
        "verboseLabel": "Net gains (losses) on trading securities"
       }
      }
     },
     "localname": "NetRealizedOrUnrealizedGainLossOnTradingSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Trading, Gain (Loss) [Abstract]"
       }
      }
     },
     "localname": "NetRealizedOrUnrealizedGainLossOnTradingSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetSharesReclassifiedToMandatorilyRedeemableCapitalStockShares": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net number of shares reclassified to mandatorily redeemable capital stock.",
        "label": "Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares",
        "negatedTerseLabel": "Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares"
       }
      }
     },
     "localname": "NetSharesReclassifiedToMandatorilyRedeemableCapitalStockShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_NetSharesReclassifiedToMandatorilyRedeemableCapitalStockValue": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of net shares reclassified to mandatorily redeemable capital stock.",
        "label": "Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value",
        "negatedTerseLabel": "Net shares reclassified to mandatorily redeemable capital stock",
        "terseLabel": "Net Shares Reclassified to Mandatorily Redeemable Capital Stock",
        "verboseLabel": "Net shares reclassified to mandatorily redeemable capital stock"
       }
      }
     },
     "localname": "NetSharesReclassifiedToMandatorilyRedeemableCapitalStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockRollForwardDetails",
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "New Accounting Pronouncements and Changes in Accounting Principles [Abstract]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "auth_ref": [
      "r85"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.",
        "label": "New Accounting Pronouncements and Changes in Accounting Principles [Text Block]",
        "terseLabel": "Recently Issued And Adopted Accounting Guidance"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/RecentlyIssuedAndAdoptedAccountingGuidance"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.",
        "label": "New Accounting Pronouncements, Policy [Policy Text Block]",
        "terseLabel": "New Accounting Pronouncements, Policy [Policy Text Block]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/BasisOfPresentationPolicies",
      "http://www.fhlbatl.com/role/RecentlyIssuedAndAdoptedAccountingGuidance"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NondesignatedMember": {
     "auth_ref": [
      "r202"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument not designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Not Designated as Hedging Instrument [Member]",
        "terseLabel": "Not Designated as Hedging Instrument [Member]"
       }
      }
     },
     "localname": "NondesignatedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesFairValueOfDerivativeInstrumentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NoninterestExpense": {
     "auth_ref": [
      "r286"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total aggregate amount of all noninterest expense.",
        "label": "Noninterest Expense",
        "totalLabel": "Total noninterest expense"
       }
      }
     },
     "localname": "NoninterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NoninterestExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Noninterest Expense [Abstract]",
        "verboseLabel": "Noninterest expense"
       }
      }
     },
     "localname": "NoninterestExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoninterestIncome": {
     "auth_ref": [
      "r285"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.",
        "label": "Noninterest Income",
        "totalLabel": "Total noninterest income"
       }
      }
     },
     "localname": "NoninterestIncome",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NoninterestIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Noninterest Income [Abstract]",
        "verboseLabel": "Noninterest income (loss)"
       }
      }
     },
     "localname": "NoninterestIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NoninterestIncomeOtherOperatingIncome": {
     "auth_ref": [
      "r46",
      "r281",
      "r315"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue earned, classified as other, excluding interest income.",
        "label": "Noninterest Income, Other Operating Income",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "NoninterestIncomeOtherOperatingIncome",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesReceivableGross": {
     "auth_ref": [
      "r147"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before allowance for credit loss, of financing receivable.",
        "label": "Financing Receivable, before Allowance for Credit Loss",
        "totalLabel": "Total recorded investment"
       }
      }
     },
     "localname": "NotesReceivableGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OfficeOfFinanceAssessmentsCostAssessedOnFederalHomeLoanBank": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of a Federal Home Loan Bank's (FHLBank) proportionate share of the costs of operating the Office of Finance.",
        "label": "Office of Finance, Cost Assessed on Federal Home Loan Bank",
        "verboseLabel": "Office of Finance"
       }
      }
     },
     "localname": "OfficeOfFinanceAssessmentsCostAssessedOnFederalHomeLoanBank",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OffsettingAssetsTableTextBlock": {
     "auth_ref": [
      "r31",
      "r32"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of derivative and other financial assets that are subject to offsetting, including master netting arrangements.",
        "label": "Offsetting Assets [Table Text Block]",
        "terseLabel": "Offsetting Assets [Table Text Block]"
       }
      }
     },
     "localname": "OffsettingAssetsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAssets": {
     "auth_ref": [
      "r2",
      "r263",
      "r307"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 11.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets classified as other.",
        "label": "Other Assets",
        "verboseLabel": "Other assets"
       }
      }
     },
     "localname": "OtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "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": "Off Balance Sheet Commitments [Table Text Block]"
       }
      }
     },
     "localname": "OtherCommitmentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent": {
     "auth_ref": [
      "r194",
      "r195",
      "r196"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive (income) loss for defined benefit plan, attributable to parent entity.",
        "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent",
        "negatedLabel": "Pension and postretirement benefit plans",
        "negatedTerseLabel": "Amortization of pension and posttretirement"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent": {
     "auth_ref": [
      "r194",
      "r195",
      "r196"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_ComprehensiveIncomeLossNetOfFederalHomeLoanBankAssessmentsAttributableToParent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of other comprehensive income (loss) attributable to parent entity.",
        "label": "Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent",
        "terseLabel": "Total other comprehensive income (loss)",
        "totalLabel": "Total other comprehensive loss"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract]",
        "verboseLabel": "Other comprehensive loss:"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax": {
     "auth_ref": [
      "r40",
      "r43",
      "r190"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.",
        "label": "Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax",
        "terseLabel": "Actuarial gain"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax": {
     "auth_ref": [
      "r37",
      "r43",
      "r137"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "fhlba_OtherComprehensiveIncomeLossOtherThanTemporaryImpairmentLossesAvailableForSaleSecuritiesAdjustment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax",
        "terseLabel": "Net change in fair value",
        "verboseLabel": "Net change in fair value on other-than-temporarily impaired available-for-sale securities"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCostAndExpenseOperating": {
     "auth_ref": [
      "r49"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "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",
        "verboseLabel": "Other operating expenses"
       }
      }
     },
     "localname": "OtherCostAndExpenseOperating",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilities": {
     "auth_ref": [
      "r273"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other.",
        "label": "Other Liabilities",
        "terseLabel": "Other liabilities",
        "verboseLabel": "Other liabilities"
       }
      }
     },
     "localname": "OtherLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoninterestExpense": {
     "auth_ref": [
      "r286"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noninterest expense classified as other.",
        "label": "Other Noninterest Expense",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherNoninterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses": {
     "auth_ref": [
      "r132"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses",
        "terseLabel": "Amount related to credit loss for which an other-than-temporary impairment was previously recognized"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentRollForwardOfCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain": {
     "auth_ref": [
      "r129"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provides the categories of debt securities, available-for-sale or held-to-maturity, on which an entity may recognize other than temporary impairments (OTTI) for which a portion related to credit losses has been recognized in earnings and a portion related to all other factors has been recognized in other comprehensive income.",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain]",
        "terseLabel": "Gain (Loss) on Investments, Including Marketable Securities and Investments Held at Cost, Categories of Investments [Domain]",
        "verboseLabel": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain]"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables",
      "http://www.fhlbatl.com/role/TradingSecuritiesTables"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld": {
     "auth_ref": [
      "r131",
      "r134"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentRollForwardOfCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows": {
     "auth_ref": [
      "r133"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held due to increases in cash flows expected to be collected and recognized over the remaining life of the security.",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows",
        "negatedTerseLabel": "Increase in cash flows expected to be collected, (accreted as interest income over the remaining lives of the applicable securities)"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentRollForwardOfCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward": {
     "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": "Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]",
        "verboseLabel": "Schedule of Roll-Forward Cumulative Credit Losses Recognized"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentRollForwardOfCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTableTextBlock": {
     "auth_ref": [
      "r129"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income.",
        "label": "Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]",
        "verboseLabel": "Schedule of Roll-Forward Cumulative Credit Losses Recognized"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other than Temporary Impairment Losses, Investments [Abstract]"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentLossesInvestmentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedInEarningsNetQualitativeDisclosuresDefaultRate": {
     "auth_ref": [
      "r130"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the default rate of the underlying assets in the security that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings.",
        "label": "Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Default Rate",
        "terseLabel": "Significant Inputs Weighted Average Percentage Rate, Default Rate"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecuritiesPortionRecognizedInEarningsNetQualitativeDisclosuresDefaultRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NoninterestIncome",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.",
        "label": "Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net",
        "negatedLabel": "Net impairment losses recognized in earnings",
        "terseLabel": "Net impairment losses recognized in earnings"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeforsaleSecuritiesBeforeTax": {
     "auth_ref": [
      "r109"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "fhlba_OtherComprehensiveIncomeLossOtherThanTemporaryImpairmentLossesAvailableForSaleSecuritiesAdjustment",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustment for other than temporary impairment (OTTI) related to factors other than credit loss on a previously impaired investment in available-for-sale debt security.",
        "label": "Other than Temporary Impairment Losses, Investments, Reclassification Adjustment of Noncredit Portion Included in Net Income, Availabe-for-sale Securities, before Tax",
        "terseLabel": "Reclassification of noncredit portion of impairment losses included in net income",
        "verboseLabel": "Noncredit other-than-temporary impairment losses"
       }
      }
     },
     "localname": "OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentOfNoncreditPortionIncludedInNetIncomeAvailabeforsaleSecuritiesBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OverTheCounterMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transaction that does not take place on an organized exchange.",
        "label": "Over the Counter [Member]",
        "terseLabel": "Uncleared derivatives [Member]"
       }
      }
     },
     "localname": "OverTheCounterMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PastDueFinancingReceivablesTableTextBlock": {
     "auth_ref": [
      "r97",
      "r98",
      "r143",
      "r153"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of aging analysis for financing receivable.",
        "label": "Financing Receivable, Past Due [Table Text Block]",
        "terseLabel": "Past Due Financing Receivables"
       }
      }
     },
     "localname": "PastDueFinancingReceivablesTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PaymentsForAffordableHousingPrograms": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for payments made by the Federal Home Loan Banks (FHLBanks) to the Affordable Housing Program (AHP).",
        "label": "Payments for Affordable Housing Programs",
        "verboseLabel": "Affordable Housing Program assessment, net"
       }
      }
     },
     "localname": "PaymentsForAffordableHousingPrograms",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForFederalHomeLoanBankAdvances": {
     "auth_ref": [
      "r54"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for disbursement to borrower related to advance, made by Federal Home Loan Bank (FHLBank), classified as investing activity.",
        "label": "Payments for FHLBank Advance, Investing Activities",
        "negatedLabel": "Made"
       }
      }
     },
     "localname": "PaymentsForFederalHomeLoanBankAdvances",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromHedgeFinancingActivities": {
     "auth_ref": [
      "r82"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.",
        "label": "Payments for (Proceeds from) Hedge, Financing Activities",
        "negatedLabel": "Net payments on derivatives containing a financing element"
       }
      }
     },
     "localname": "PaymentsForProceedsFromHedgeFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromLoansAndLeasesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Payments for (Proceeds from) Loans and Leases [Abstract]",
        "verboseLabel": "Mortgage loans:"
       }
      }
     },
     "localname": "PaymentsForProceedsFromLoansAndLeasesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PaymentsForRepurchaseOfCommonStock": {
     "auth_ref": [
      "r59"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow to reacquire common stock during the period.",
        "label": "Payments for Repurchase of Common Stock",
        "negatedLabel": "Payments for repurchase/redemption of capital stock"
       }
      }
     },
     "localname": "PaymentsForRepurchaseOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDebtIssuanceCosts": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.",
        "label": "Payments of Debt Issuance Costs",
        "negatedLabel": "Payments for debt issuance costs"
       }
      }
     },
     "localname": "PaymentsOfDebtIssuanceCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividends": {
     "auth_ref": [
      "r59"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.",
        "label": "Payments of Dividends",
        "terseLabel": "Payments of Dividends"
       }
      }
     },
     "localname": "PaymentsOfDividends",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividendsCommonStock": {
     "auth_ref": [
      "r59"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.",
        "label": "Payments of Ordinary Dividends, Common Stock",
        "negatedLabel": "Cash dividends paid"
       }
      }
     },
     "localname": "PaymentsOfDividendsCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireHeldToMaturitySecurities": {
     "auth_ref": [
      "r54",
      "r107"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow through purchase of long-term held-to-maturity securities.",
        "label": "Payments to Acquire Held-to-maturity Securities",
        "negatedLabel": "Purchases of long-term"
       }
      }
     },
     "localname": "PaymentsToAcquireHeldToMaturitySecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireInvestmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Payments to Acquire Investments [Abstract]",
        "verboseLabel": "Trading securities:"
       }
      }
     },
     "localname": "PaymentsToAcquireInvestmentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PaymentsToAcquireProductiveAssets": {
     "auth_ref": [
      "r55"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 13.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.",
        "label": "Payments to Acquire Productive Assets",
        "negatedTerseLabel": "Purchase of premises, equipment, and software"
       }
      }
     },
     "localname": "PaymentsToAcquireProductiveAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment": {
     "auth_ref": [
      "r56"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).",
        "label": "Payments to Acquire Trading Securities Held-for-investment",
        "negatedTerseLabel": "Purchases of long-term"
       }
      }
     },
     "localname": "PaymentsToAcquireTradingSecuritiesHeldforinvestment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PortionAtFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r244"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PrepaymentFeesOnAdvancesNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_InterestAndDividendIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income earned, after hedging basis adjustments, from fees charged for prepayment of certain Federal Home Loan Bank (FHLBank) advances before original maturity.",
        "label": "Prepayment Fees on Advances, Net",
        "terseLabel": "Prepayment fees, net"
       }
      }
     },
     "localname": "PrepaymentFeesOnAdvancesNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrimeMember": {
     "auth_ref": [
      "r148"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit rating classification of borrowers with strong credit histories and who have a low risk of default and qualify for the prime rate.",
        "label": "Prime [Member]",
        "terseLabel": "Prime [Member]"
       }
      }
     },
     "localname": "PrimeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ProceedsFromFederalHomeLoanBankAdvances": {
     "auth_ref": [
      "r52"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from collection of advance by Federal Home Loan Bank (FHLBank), classified as investing activity.",
        "label": "Proceeds from FHLBank Advance, Investing Activities",
        "verboseLabel": "Proceeds from principal collected"
       }
      }
     },
     "localname": "ProceedsFromFederalHomeLoanBankAdvances",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfCommonStock": {
     "auth_ref": [
      "r57"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the additional capital contribution to the entity.",
        "label": "Proceeds from Issuance of Common Stock",
        "verboseLabel": "Proceeds from issuance of capital stock"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfLongTermDebtAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Proceeds from Issuance of Long-term Debt [Abstract]",
        "verboseLabel": "Proceeds from issuance of consolidated obligations:"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfLongTermDebtAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt": {
     "auth_ref": [
      "r58"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from issuance of long-term debt classified as other.",
        "label": "Proceeds from Issuance of Other Long-term Debt",
        "verboseLabel": "Bonds"
       }
      }
     },
     "localname": "ProceedsFromIssuanceOfOtherLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities": {
     "auth_ref": [
      "r52",
      "r107"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.",
        "label": "Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities",
        "verboseLabel": "Proceeds from principal collected"
       }
      }
     },
     "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromOtherShortTermDebt": {
     "auth_ref": [
      "r58"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from short-term debt classified as other.",
        "label": "Proceeds from Other Short-term Debt",
        "verboseLabel": "Discount notes"
       }
      }
     },
     "localname": "ProceedsFromOtherShortTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks": {
     "auth_ref": [
      "r72",
      "r294"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits.",
        "label": "Proceeds from (Payments for) in Interest-bearing Deposits in Banks",
        "verboseLabel": "Interest-bearing deposits"
       }
      }
     },
     "localname": "ProceedsFromPaymentsForInInterestBearingDepositsInBanks",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell": {
     "auth_ref": [
      "r71",
      "r72"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net cash flow from purchases followed by sales of securities under terms of reverse repurchase agreements.",
        "label": "Proceeds from (Payments for) Securities Purchased under Agreements to Resell",
        "terseLabel": "Securities purchased under agreements to resell"
       }
      }
     },
     "localname": "ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment": {
     "auth_ref": [
      "r52"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.",
        "label": "Proceeds from Principal Repayments on Loans and Leases Held-for-investment",
        "verboseLabel": "Proceeds from principal collected"
       }
      }
     },
     "localname": "ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities": {
     "auth_ref": [
      "r51",
      "r52",
      "r107"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Proceeds from Sale and Maturity of Debt Securities, Available-for-sale",
        "verboseLabel": "Proceeds from principal collected"
       }
      }
     },
     "localname": "ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Proceeds from Sale and Maturity of Debt Securities, Available-for-sale [Abstract]",
        "terseLabel": "Proceeds from Sale and Maturity of Debt Securities, Available-for-sale [Abstract]"
       }
      }
     },
     "localname": "ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Proceeds from Sale and Maturity of Held-to-maturity Securities [Abstract]",
        "terseLabel": "Held-to-maturity securities:"
       }
      }
     },
     "localname": "ProceedsFromSaleAndMaturityOfHeldToMaturitySecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ProceedsFromSaleOfForeclosedAssets": {
     "auth_ref": [
      "r53"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 12.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.",
        "label": "Proceeds from Sale of Foreclosed Assets",
        "verboseLabel": "Proceeds from sale of foreclosed assets"
       }
      }
     },
     "localname": "ProceedsFromSaleOfForeclosedAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r0",
      "r1",
      "r159",
      "r312"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 12.0,
       "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",
        "verboseLabel": "Premises and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProvisionForLoanLossesExpensed": {
     "auth_ref": [
      "r141",
      "r270",
      "r280"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of credit loss expense (reversal of expense) for financing receivable.",
        "label": "Financing Receivable, Credit Loss, Expense (Reversal)",
        "verboseLabel": "Provision for credit losses"
       }
      }
     },
     "localname": "ProvisionForLoanLossesExpensed",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails",
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReceivableTypeDomain": {
     "auth_ref": [
      "r22"
     ],
     "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": "Receivable [Domain]"
       }
      }
     },
     "localname": "ReceivableTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ReceivablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Receivables [Abstract]"
       }
      }
     },
     "localname": "ReceivablesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RegulatorExpensesCostAssessedOnFederalHomeLoanBank": {
     "auth_ref": [],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_NoninterestExpense",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of fees or assessments to fund the operations of the regulator of Federal Home Loan Banks (FHLBanks).",
        "label": "Regulator Expenses, Cost Assessed on Federal Home Loan Bank",
        "verboseLabel": "Finance Agency"
       }
      }
     },
     "localname": "RegulatorExpensesCostAssessedOnFederalHomeLoanBank",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfLongTermDebtAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Repayments of Long-term Debt [Abstract]",
        "terseLabel": "Payments for maturing and retiring consolidated obligations:"
       }
      }
     },
     "localname": "RepaymentsOfLongTermDebtAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RepaymentsOfMandatoryRedeemableCapitalSecurities": {
     "auth_ref": [
      "r59"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow related to equity securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) that is (or are) initially more than one year (or the normal operating cycle, if longer) from the issuance date, or upon an event that is certain to occur beyond one year (or the normal operating cycle, if longer) from the issuance date.",
        "label": "Repayments of Mandatory Redeemable Capital Securities",
        "negatedLabel": "Payments for repurchase/redemption of mandatorily redeemable capital stock",
        "negatedTerseLabel": "Repurchase/redemption of mandatorily redeemable capital stock"
       }
      }
     },
     "localname": "RepaymentsOfMandatoryRedeemableCapitalSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockRollForwardDetails",
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfOtherLongTermDebt": {
     "auth_ref": [
      "r60"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 7.0,
       "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",
        "negatedLabel": "Bonds"
       }
      }
     },
     "localname": "RepaymentsOfOtherLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RepaymentsOfOtherShortTermDebt": {
     "auth_ref": [
      "r60"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 6.0,
       "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 within one year or the operating cycle, if longer.",
        "label": "Repayments of Other Short-term Debt",
        "negatedLabel": "Discount notes"
       }
      }
     },
     "localname": "RepaymentsOfOtherShortTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResidentialMortgageBackedSecuritiesMember": {
     "auth_ref": [
      "r110",
      "r188"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by residential real estate mortgage loans.",
        "label": "Residential Mortgage Backed Securities [Member]",
        "terseLabel": "Residential Mortgage Backed Securities [Member]",
        "verboseLabel": "Mortgage-backed Securities, Private-label residential[Member]"
       }
      }
     },
     "localname": "ResidentialMortgageBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ResidentialPortfolioSegmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Portfolio segment of the company's total financing receivables related to residential financing receivables.",
        "label": "Residential Portfolio Segment [Member]",
        "terseLabel": "Residential Portfolio Segment [Member]"
       }
      }
     },
     "localname": "ResidentialPortfolioSegmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r11",
      "r186",
      "r310"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings (Accumulated Deficit)",
        "totalLabel": "Total retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficitAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Retained Earnings (Accumulated Deficit) [Abstract]",
        "verboseLabel": "Retained earnings:"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficitAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RetainedEarningsAppropriated": {
     "auth_ref": [
      "r24",
      "r179",
      "r180",
      "r306"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_RetainedEarningsAccumulatedDeficit",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.",
        "label": "Retained Earnings, Appropriated",
        "verboseLabel": "Restricted"
       }
      }
     },
     "localname": "RetainedEarningsAppropriated",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsAppropriatedMember": {
     "auth_ref": [
      "r9",
      "r179"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.",
        "label": "Retained Earnings, Appropriated [Member]",
        "verboseLabel": "Retained Earnings, Restricted [Member]"
       }
      }
     },
     "localname": "RetainedEarningsAppropriatedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]",
        "verboseLabel": "Retained Earnings"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsUnappropriated": {
     "auth_ref": [
      "r10",
      "r309"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_RetainedEarningsAccumulatedDeficit",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit.",
        "label": "Retained Earnings, Unappropriated",
        "verboseLabel": "Unrestricted"
       }
      }
     },
     "localname": "RetainedEarningsUnappropriated",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsUnappropriatedMember": {
     "auth_ref": [
      "r10"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A segregation of retained earnings which is available for dividend distribution. Earnings not paid out as dividends but instead reinvested in the core business or used to pay off debt. Unappropriated profit is part of shareholder equity. Also called cumulative distributions or earned surplus or accumulated earnings or unappropriated profit.",
        "label": "Retained Earnings, Unappropriated [Member]",
        "verboseLabel": "Retained Earnings, Unrestricted [Member]"
       }
      }
     },
     "localname": "RetainedEarningsUnappropriatedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable": {
     "auth_ref": [
      "r22"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": {
     "auth_ref": [
      "r44"
     ],
     "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": "Components Comprising Accumulated Other Comprehensive Income"
       }
      }
     },
     "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems": {
     "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 Securities, Available-for-sale [Line Items]",
        "terseLabel": "Debt Securities, Available-for-sale [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.",
        "label": "Schedule of Available-for-sale Securities Reconciliation [Table Text Block]",
        "verboseLabel": "Available-for-Sale Securities Reconciliation"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesTable": {
     "auth_ref": [
      "r116",
      "r117",
      "r127",
      "r128",
      "r129",
      "r136",
      "r295",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.",
        "label": "Schedule of Available-for-sale Securities [Table]",
        "terseLabel": "Schedule of Available-for-sale Securities [Table]"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock": {
     "auth_ref": [
      "r300",
      "r301",
      "r302",
      "r303"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.",
        "label": "Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]",
        "terseLabel": "Schedule of Compliance With Regulatory Capital Requirements"
       }
      }
     },
     "localname": "ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock": {
     "auth_ref": [
      "r205",
      "r211",
      "r217"
     ],
     "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": "Net Gains (Losses) on Fair Value Hedging Relationships"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock": {
     "auth_ref": [
      "r208"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of 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": "Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]",
        "verboseLabel": "Fair Value of Derivative Instruments"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsLineItems": {
     "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": "Schedule of Equity Method Investments [Line Items]",
        "terseLabel": "Schedule of Equity Method Investments [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfEquityMethodInvestmentsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsTable": {
     "auth_ref": [
      "r139"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of information required and determined to be disclosed concerning equity method investments in common stock. The summarized information includes: (a) the name of each investee or group of investees for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available.",
        "label": "Schedule of Equity Method Investments [Table]",
        "terseLabel": "Schedule of Equity Method Investments [Table]"
       }
      }
     },
     "localname": "ScheduleOfEquityMethodInvestmentsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": {
     "auth_ref": [
      "r232",
      "r233"
     ],
     "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": "Financial Assets and Liabilities Measured at Fair Value on Recurring Basis"
       }
      }
     },
     "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock": {
     "auth_ref": [
      "r209"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure for fair value hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.",
        "label": "Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]",
        "verboseLabel": "Cumulative Basis Adjustments for Fair Value Hedges"
       }
      }
     },
     "localname": "ScheduleOfFairValueHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable": {
     "auth_ref": [
      "r142"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about allowance for credit loss on financing receivable.",
        "label": "Financing Receivable, Allowance for Credit Loss [Table]",
        "terseLabel": "Financing Receivable, Allowance for Credit Loss [Table]"
       }
      }
     },
     "localname": "ScheduleOfFinancingReceivableAllowanceForCreditLossesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesMortgageLoanPortfolioByImpairmentMethodologyDetails",
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesRollForwardOfAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable": {
     "auth_ref": [
      "r148",
      "r152"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about credit quality indicator for financing receivable.",
        "label": "Financing Receivable, Credit Quality Indicator [Table]",
        "terseLabel": "Financing Receivable, Credit Quality Indicator [Table]"
       }
      }
     },
     "localname": "ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems": {
     "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": "Schedule of Held-to-maturity Securities [Line Items]",
        "terseLabel": "Schedule of Held-to-maturity Securities [Line Items]"
       }
      }
     },
     "localname": "ScheduleOfHeldToMaturitySecuritiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfHeldToMaturitySecuritiesTable": {
     "auth_ref": [
      "r123"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about investment in debt security measured at amortized cost (held-to-maturity).",
        "label": "Debt Securities, Held-to-maturity [Table]",
        "terseLabel": "Debt Securities, Held-to-maturity [Table]"
       }
      }
     },
     "localname": "ScheduleOfHeldToMaturitySecuritiesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": {
     "auth_ref": [
      "r174"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.",
        "label": "Schedule of Maturities of Long-term Debt [Table Text Block]",
        "verboseLabel": "Consolidated Obligation Bonds Outstanding, by Year of Contractual Maturity"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock": {
     "auth_ref": [
      "r210",
      "r212"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument.",
        "label": "Derivatives Not Designated as Hedging Instruments [Table Text Block]",
        "terseLabel": "Derivatives Not Designated as Hedging Instruments [Table Text Block]"
       }
      }
     },
     "localname": "ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfParticipatingMortgageLoansTextBlock": {
     "auth_ref": [
      "r176"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the terms and amounts of participation in loan arrangements.",
        "label": "Schedule of Participating Mortgage Loans [Table Text Block]",
        "terseLabel": "Mortgage Loans Held for Portfolio"
       }
      }
     },
     "localname": "ScheduleOfParticipatingMortgageLoansTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShortTermDebtTable": {
     "auth_ref": [
      "r17"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to borrowings under which repayment was required in less than twelve months (or normal operating cycle, if longer) after its issuance. It may include: (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 and measures of the maximum and average amount outstanding during the period; (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]",
        "terseLabel": "Schedule of Short-term Debt [Table]"
       }
      }
     },
     "localname": "ScheduleOfShortTermDebtTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfShortTermDebtTextBlock": {
     "auth_ref": [
      "r17"
     ],
     "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]",
        "verboseLabel": "Consolidated Obligation Discount Notes"
       }
      }
     },
     "localname": "ScheduleOfShortTermDebtTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems": {
     "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 and Equity Securities, FV-NI [Line Items]",
        "terseLabel": "Schedule of Trading Securities"
       }
      }
     },
     "localname": "ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesTables",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security with change in fair value recognized in net income (FV-NI).",
        "label": "Debt Securities, Trading, and Equity Securities, FV-NI [Table]",
        "terseLabel": "Trading Securities [Table]"
       }
      }
     },
     "localname": "ScheduleOfTradingSecuritiesAndOtherTradingAssetsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesTables",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock": {
     "auth_ref": [
      "r127"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).",
        "label": "Schedule of Unrealized Loss on Investments [Table Text Block]",
        "terseLabel": "Schedule of Unrealized Loss on Investments",
        "verboseLabel": "Available-for-Sale Securities with Unrealized Losses"
       }
      }
     },
     "localname": "ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesTables",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SecuritiesPurchasedUnderAgreementsToResell": {
     "auth_ref": [
      "r25",
      "r28",
      "r33",
      "r78",
      "r268"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 3.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.",
        "label": "Securities Purchased under Agreements to Resell",
        "terseLabel": "Securities purchased under agreements to resell"
       }
      }
     },
     "localname": "SecuritiesPurchasedUnderAgreementsToResell",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharesIssued": {
     "auth_ref": [
      "r181"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.",
        "label": "Shares, Issued",
        "periodEndLabel": "Ending balance (shares)",
        "periodStartLabel": "Beginning balance (shares)"
       }
      }
     },
     "localname": "SharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount": {
     "auth_ref": [
      "r178"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "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",
        "periodEndLabel": "Balance, end of period",
        "periodStartLabel": "Balance, beginning of period",
        "terseLabel": "Mandatorily redeemable capital stock",
        "verboseLabel": "Mandatorily redeemable capital stock"
       }
      }
     },
     "localname": "SharesSubjectToMandatoryRedemptionSettlementTermsAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockByYearOfRedemptionDetails",
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockMandatorilyRedeemableCapitalStockRollForwardDetails",
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStockNarrativeDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsFairValueOfShares": {
     "auth_ref": [
      "r178"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date.",
        "label": "Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Fair Value of Shares",
        "terseLabel": "Mandatorily redeemable capital stock"
       }
      }
     },
     "localname": "SharesSubjectToMandatoryRedemptionSettlementTermsFairValueOfShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermDebtLineItems": {
     "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": "Short-term Debt [Line Items]",
        "terseLabel": "Short-term Debt [Line Items]"
       }
      }
     },
     "localname": "ShortTermDebtLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShortTermDebtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt arrangement having an initial term within one year or the normal operating cycle, if longer.",
        "label": "Short-term Debt [Member]",
        "terseLabel": "Short-term Debt [Member]",
        "verboseLabel": "Unsettled Discount Notes [Member]"
       }
      }
     },
     "localname": "ShortTermDebtMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShortTermDebtTypeAxis": {
     "auth_ref": [
      "r17"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of short-term debt arrangement.",
        "label": "Short-term Debt, Type [Axis]",
        "terseLabel": "Short-term Debt, Type [Axis]"
       }
      }
     },
     "localname": "ShortTermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShortTermDebtTypeDomain": {
     "auth_ref": [
      "r15"
     ],
     "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, Type [Domain]"
       }
      }
     },
     "localname": "ShortTermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShortTermDebtWeightedAverageInterestRate": {
     "auth_ref": [
      "r16"
     ],
     "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": "Discount notes weighted average interest rate"
       }
      }
     },
     "localname": "ShortTermDebtWeightedAverageInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/ConsolidatedObligationsDiscountNotesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_ShorttermDebtFairValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.",
        "label": "Short-term Debt, Fair Value",
        "terseLabel": "Discount notes"
       }
      }
     },
     "localname": "ShorttermDebtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StandbyLettersOfCreditMember": {
     "auth_ref": [
      "r170",
      "r173",
      "r193",
      "r317"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation.",
        "label": "Standby Letters of Credit [Member]",
        "terseLabel": "Standby Letters of Credit [Member]"
       }
      }
     },
     "localname": "StandbyLettersOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_StatementClassOfStockAxis": {
     "auth_ref": [
      "r6",
      "r7",
      "r8",
      "r181"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r21",
      "r181"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]",
        "terseLabel": "Statement, Equity Components [Axis]"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AccumulatedOtherComprehensiveIncomeDetails",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnauditedParenthetical",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesNewIssues": {
     "auth_ref": [
      "r7",
      "r8",
      "r181",
      "r186"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of new stock issued during the period.",
        "label": "Stock Issued During Period, Shares, New Issues",
        "verboseLabel": "Issuance of capital stock (shares)"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesNewIssues",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueNewIssues": {
     "auth_ref": [
      "r7",
      "r8",
      "r181",
      "r186"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.",
        "label": "Stock Issued During Period, Value, New Issues",
        "verboseLabel": "Issuance of capital stock"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueNewIssues",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockRepurchasedDuringPeriodShares": {
     "auth_ref": [
      "r7",
      "r8",
      "r181",
      "r186"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.",
        "label": "Stock Repurchased During Period, Shares",
        "negatedTerseLabel": "Repurchase/redemption of capital stock (shares)"
       }
      }
     },
     "localname": "StockRepurchasedDuringPeriodShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockRepurchasedDuringPeriodValue": {
     "auth_ref": [
      "r7",
      "r8",
      "r181",
      "r186"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.",
        "label": "Stock Repurchased During Period, Value",
        "negatedTerseLabel": "Repurchase/redemption of capital stock"
       }
      }
     },
     "localname": "StockRepurchasedDuringPeriodValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r8",
      "r12",
      "r13",
      "r99"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.",
        "label": "Stockholders' Equity Attributable to Parent",
        "periodEndLabel": "Ending balance",
        "periodStartLabel": "Beginning balance",
        "totalLabel": "Total capital"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/StatementsOfStockholdersEquityUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders' Equity Attributable to Parent [Abstract]",
        "verboseLabel": "Capital"
       }
      }
     },
     "localname": "StockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityNoteDisclosureTextBlock": {
     "auth_ref": [
      "r187"
     ],
     "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]",
        "verboseLabel": "Capital and Mandatorily Redeemable Capital Stock"
       }
      }
     },
     "localname": "StockholdersEquityNoteDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CapitalAndMandatorilyRedeemableCapitalStock"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SubsequentEventLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.",
        "label": "Subsequent Event [Line Items]",
        "terseLabel": "Subsequent Event [Line Items]"
       }
      }
     },
     "localname": "SubsequentEventLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTable": {
     "auth_ref": [
      "r253"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Discloses pertinent information about one or more 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.",
        "label": "Subsequent Event [Table]",
        "terseLabel": "Subsequent Event [Table]"
       }
      }
     },
     "localname": "SubsequentEventTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTypeAxis": {
     "auth_ref": [
      "r253"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTypeDomain": {
     "auth_ref": [
      "r253"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SubsequentEventsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Subsequent Events [Abstract]"
       }
      }
     },
     "localname": "SubsequentEventsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventsTextBlock": {
     "auth_ref": [
      "r254"
     ],
     "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/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/SubsequentEvents"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental Cash Flow Information [Abstract]",
        "verboseLabel": "Supplemental disclosures of cash flow information:"
       }
      }
     },
     "localname": "SupplementalCashFlowInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
        "label": "Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]",
        "terseLabel": "Schedule of Major Trading Securities"
       }
      }
     },
     "localname": "TradingSecuritiesAndCertainTradingAssetsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_TradingSecuritiesDebt": {
     "auth_ref": [
      "r105",
      "r106"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited": {
       "order": 1.0,
       "parentTag": "us-gaap_MarketableSecurities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).",
        "label": "Debt Securities, Trading",
        "terseLabel": "Trading securities",
        "verboseLabel": "Trading Securities"
       }
      }
     },
     "localname": "TradingSecuritiesDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesFairValueSummaryDetails",
      "http://www.fhlbatl.com/role/StatementsOfConditionUnaudited",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.",
        "label": "Trading Securities, Change in Unrealized Holding Gain (Loss)",
        "verboseLabel": "Net gains (losses) on trading securities held at period end"
       }
      }
     },
     "localname": "TradingSecuritiesUnrealizedHoldingGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/TradingSecuritiesNetLossesOnTradingSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransactionDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Agreement between buyer and seller for the exchange of financial instruments.",
        "label": "Transaction [Domain]",
        "terseLabel": "Transaction [Domain]"
       }
      }
     },
     "localname": "TransactionDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TransactionTypeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of agreement between buyer and seller for the exchange of financial instruments.",
        "label": "Transaction Type [Axis]",
        "terseLabel": "Transaction Type [Axis]"
       }
      }
     },
     "localname": "TransactionTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesOffsettingOfDerivativeAssetsAndDerivativeLiabilitiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TransferToOtherRealEstate": {
     "auth_ref": [
      "r74",
      "r75",
      "r76"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.",
        "label": "Real Estate Owned, Transfer to Real Estate Owned",
        "terseLabel": "Transfers of mortgage loans to real estate owned"
       }
      }
     },
     "localname": "TransferToOtherRealEstate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": {
     "auth_ref": [
      "r260"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.",
        "label": "Financial Instruments [Domain]",
        "terseLabel": "Financial Instruments [Domain]",
        "verboseLabel": "Held-to-Maturity"
       }
      }
     },
     "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesAvailableForSaleByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleMbsIssuedByMembersOrAffiliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/AvailableForSaleSecuritiesSummaryOfAvailableForSaleSecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/EstimatedFairValuesRollForwardOfLevel3AssetsAndLiabilitiesDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesRedemptionTermsDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturityMbsIssuedByMembersOrAffliatesOfMembersDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/OtherThanTemporaryImpairmentOtherThanTemporaryImpairmentSummaryOfSignificantInputsDetails",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember": {
     "auth_ref": [
      "r188",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debentures, bonds and other debt securities issued by US government sponsored entities (GSEs), for example, but not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB). Excludes debt issued by the Government National Mortgage Association (GNMA or Ginnie Mae).",
        "label": "US Government-sponsored Enterprises Debt Securities [Member]",
        "terseLabel": "Government-Sponsored Enterprises Debt Obligations [Member]"
       }
      }
     },
     "localname": "USGovernmentSponsoredEnterprisesDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USStatesAndPoliticalSubdivisionsMember": {
     "auth_ref": [
      "r188",
      "r316"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.",
        "label": "US States and Political Subdivisions Debt Securities [Member]",
        "verboseLabel": "State or local housing agency debt obligations"
       }
      }
     },
     "localname": "USStatesAndPoliticalSubdivisionsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesHeldToMaturityByMajorSecurityTypeDetails",
      "http://www.fhlbatl.com/role/HeldToMaturitySecuritiesSummaryOfHeldToMaturitySecuritiesInContinuousUnrealizedLossPositionDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USTreasurySecuritiesMember": {
     "auth_ref": [
      "r188",
      "r192",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This category includes information about debt securities issued by the United States Department of the Treasury and backed by the United States government. Such securities primarily consist of 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).",
        "label": "US Treasury Securities [Member]",
        "terseLabel": "US Treasury Securities [Member]"
       }
      }
     },
     "localname": "USTreasurySecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/EstimatedFairValuesEstimatedFairValueMeasurementsOnRecurringBasisDetails",
      "http://www.fhlbatl.com/role/TradingSecuritiesTradingSecuritiesByMajorSecurityTypeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnrealizedGainLossOnDerivatives": {
     "auth_ref": [
      "r68"
     ],
     "calculation": {
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited": {
       "order": 2.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "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",
        "negatedLabel": "Net change in derivatives and hedging activities"
       }
      }
     },
     "localname": "UnrealizedGainLossOnDerivatives",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/StatementsOfCashFlowsUnaudited"
     ],
     "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": "Unsecured Debt [Member]",
        "verboseLabel": "Unsettled Consolidated Obligation Bonds [Member]"
       }
      }
     },
     "localname": "UnsecuredDebtMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/CommitmentsAndContingenciesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesCumulativeBasisAdjustmentsForFairValueHedgesDetails",
      "http://www.fhlbatl.com/role/DerivativesAndHedgingActivitiesNetGainsLossesOnFairValueHedgingRelationshipsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UsGovernmentAgencyInsuredLoansMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Guarantee by US government agencies, including but not limited to, Government National Mortgage Association (GNMA) and Department of Veterans Affairs (VA) for government insured loans.",
        "label": "US Government Agency Insured Loans [Member]",
        "terseLabel": "Government-guaranteed or insured mortgage loans [Member]"
       }
      }
     },
     "localname": "UsGovernmentAgencyInsuredLoansMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.fhlbatl.com/role/AllowanceForCreditLossesCreditQualityIndicatorsDetails",
      "http://www.fhlbatl.com/role/MortgageLoansHeldForPortfolioDetails"
     ],
     "xbrltype": "domainItemType"
    }
   },
   "unitCount": 8
  }
 },
 "std_ref": {
  "r0": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r1": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3)(ii))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.L.1)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196772"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "20",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196816"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)(1)(ii)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "310",
   "URI": "http://asc.fasb.org/topic&trid=2196771"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=SL6284427-111562"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6283291-111563"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aaa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)(3)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27340-111563"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(31))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "a.1.",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284381-111563"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6284393-111563"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)-(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "320",
   "URI": "http://asc.fasb.org/topic&trid=2196928"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(b)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(32))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921830-210448"
  },
  "r15": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921833-210448"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921835-210448"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "79",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "80",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456"
  },
  "r159": {
   "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"
  },
  "r16": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r160": {
   "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"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14615-108349"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14394-108349"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14453-108349"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14472-108349"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r17": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118956092&loc=d3e12803-110250"
  },
  "r174": {
   "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"
  },
  "r175": {
   "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"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=99377297&loc=d3e10013-112621"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r178": {
   "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"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=65888546&loc=d3e21332-112643"
  },
  "r18": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=65888546&loc=d3e21346-112643"
  },
  "r181": {
   "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"
  },
  "r182": {
   "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"
  },
  "r183": {
   "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"
  },
  "r184": {
   "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"
  },
  "r185": {
   "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"
  },
  "r186": {
   "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=27012166&loc=d3e187085-122770"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "505",
   "URI": "http://asc.fasb.org/topic&trid=2208762"
  },
  "r188": {
   "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"
  },
  "r189": {
   "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"
  },
  "r19": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r190": {
   "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"
  },
  "r191": {
   "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"
  },
  "r192": {
   "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"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(f)(2)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116873149&loc=d3e923-111674"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683"
  },
  "r196": {
   "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"
  },
  "r197": {
   "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"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959"
  },
  "r2": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r20": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r21": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4CC",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(5)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4EE",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4EE",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959"
  },
  "r22": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4EE",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "182",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=116861445&loc=SL5629052-113961"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Subparagraph": "(a)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986"
  },
  "r23": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "815",
   "URI": "http://asc.fasb.org/topic&trid=2229140"
  },
  "r232": {
   "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"
  },
  "r233": {
   "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"
  },
  "r234": {
   "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"
  },
  "r235": {
   "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"
  },
  "r236": {
   "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"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r239": {
   "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"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(30)(a)(3)(ii))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r240": {
   "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"
  },
  "r241": {
   "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"
  },
  "r242": {
   "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"
  },
  "r243": {
   "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"
  },
  "r244": {
   "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"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13476-108611"
  },
  "r248": {
   "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"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399"
  },
  "r252": {
   "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"
  },
  "r253": {
   "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"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "855",
   "URI": "http://asc.fasb.org/topic&trid=2122774"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719"
  },
  "r26": {
   "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"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "210",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117340910&loc=d3e59706-112781"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(10))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r264": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r265": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r266": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(3))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(6)(a)(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r27": {
   "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"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(7)(d))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.12)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r272": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r273": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r274": {
   "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=6876686&loc=d3e534808-122878"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.2)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.3)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.4)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.7(d))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.7)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r28": {
   "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"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.1)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.1-5)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.10)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.13)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.14)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.4)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.6)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.7)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r29": {
   "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"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.8)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r291": {
   "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=116637391&loc=SL114874048-224260"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Subparagraph": "(a)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r299": {
   "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"
  },
  "r3": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(c)(1)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1G",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "505",
   "Subparagraph": "(c)(2)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "942",
   "URI": "http://asc.fasb.org/topic&trid=2209208"
  },
  "r305": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(23)(a)(4)(i))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(10))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r308": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4)(ii))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r31": {
   "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"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r312": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r313": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r314": {
   "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=119400593&loc=d3e572229-122910"
  },
  "r315": {
   "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=116637232&loc=SL114874131-224263"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=66023616&loc=SL35737432-115832"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "310",
   "Subparagraph": "(SX 210.12-29(Footnote 3))",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014"
  },
  "r319": {
   "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=6589523&loc=d3e617274-123014"
  },
  "r32": {
   "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"
  },
  "r320": {
   "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=6590653&loc=d3e638233-123024"
  },
  "r321": {
   "Name": "Form 10-Q",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-13"
  },
  "r322": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1-"
  },
  "r323": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r324": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r325": {
   "Article": "12",
   "Footnote": "2",
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "12"
  },
  "r326": {
   "Article": "12",
   "Name": "Regulation S-X (SX)",
   "Number": "210",
   "Publisher": "SEC",
   "Section": "13",
   "Sentence": "Column B"
  },
  "r33": {
   "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"
  },
  "r34": {
   "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"
  },
  "r35": {
   "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"
  },
  "r36": {
   "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"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r4": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i),(j),(k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(1)(e))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868656-224227"
  },
  "r47": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(b)(4))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r49": {
   "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=116634182&loc=SL114868664-224227"
  },
  "r5": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "220",
   "URI": "http://asc.fasb.org/topic&trid=2134417"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r6": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "26",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3574-108585"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r7": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3095-108585"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3098-108585"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(2)(i))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r79": {
   "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=26873400&loc=d3e23780-122690"
  },
  "r8": {
   "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=6877327&loc=d3e13212-122682"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(h)(1)(i))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(n)(2))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r82": {
   "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=26873400&loc=d3e24072-122690"
  },
  "r83": {
   "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=26873400&loc=d3e24072-122690"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "235",
   "URI": "http://asc.fasb.org/topic&trid=2122369"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "250",
   "URI": "http://asc.fasb.org/topic&trid=2122394"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3)(i))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5066-111524"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL49126937-111524"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953401-111524"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 4.E)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
  }
 },
 "version": "2.1"
}
