{ "instance": { "ual06301910q.htm": { "axisCustom": 1, "axisStandard": 28, "contextCount": 350, "dts": { "calculationLink": { "local": [ "ual-20190630_cal.xml" ] }, "definitionLink": { "local": [ "ual-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": [ "ual06301910q.htm" ] }, "labelLink": { "local": [ "ual-20190630_lab.xml" ], "remote": [ "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml", "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml", "http://xbrl.fasb.org/srt/2019/elts/srt-doc-2019-01-31.xml" ] }, "presentationLink": { "local": [ "ual-20190630_pre.xml" ] }, "referenceLink": { "remote": [ "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml", "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml", "http://xbrl.fasb.org/srt/2019/elts/srt-ref-2019-01-31.xml" ] }, "schema": { "local": [ "ual-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/reference-2009-12-16.xsd", "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd", "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd" ] } }, "elementCount": 547, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2019-01-31": 29, "http://www.unitedcontinentalholdings.com/20190630": 1, "http://xbrl.sec.gov/dei/2019-01-31": 6, "total": 36 }, "keyCustom": 53, "keyStandard": 336, "memberCustom": 35, "memberStandard": 46, "nsprefix": "ual", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "report": { "R1": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "0001000 - Document - Document and Entity Information", "role": "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2104100 - Disclosure - Revenue", "role": "http://www.unitedcontinentalholdings.com/role/Revenue", "shortName": "Revenue", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2107100 - Disclosure - Earnings Per Share", "role": "http://www.unitedcontinentalholdings.com/role/EarningsPerShare", "shortName": "Earnings Per Share", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.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": "2109100 - Disclosure - Accumulated Other Comprehensive Income (Loss)", "role": "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLoss", "shortName": "Accumulated Other Comprehensive Income (Loss)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ComprehensiveIncomeNoteTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2112100 - Disclosure - Income Taxes", "role": "http://www.unitedcontinentalholdings.com/role/IncomeTaxes", "shortName": "Income Taxes", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2113100 - Disclosure - Employee Benefit Plans", "role": "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlans", "shortName": "Employee Benefit Plans", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CompensationAndEmployeeBenefitPlansTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2116100 - Disclosure - BRW Term Loan", "role": "http://www.unitedcontinentalholdings.com/role/BrwTermLoan", "shortName": "BRW Term Loan", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.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 - Financial Instruments and Fair Value Measurements", "role": "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurements", "shortName": "Financial Instruments and Fair Value Measurements", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:LesseeOperatingAndFinanceLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2123100 - Disclosure - Leases", "role": "http://www.unitedcontinentalholdings.com/role/Leases", "shortName": "Leases", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:LesseeOperatingAndFinanceLeasesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.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": "2126100 - Disclosure - Commitments and Contingencies", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingencies", "shortName": "Commitments and Contingencies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LongTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2127100 - Disclosure - Debt", "role": "http://www.unitedcontinentalholdings.com/role/Debt", "shortName": "Debt", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LongTermDebtTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1001000 - Statement - Statements of Consolidated Operations (Unaudited)", "role": "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "shortName": "Statements of Consolidated Operations (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "lang": null, "name": "us-gaap:LaborAndRelatedExpense", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2128100 - Disclosure - Special Charges and Mark-to-Market (\"MTM\") Adjustments", "role": "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustments", "shortName": "Special Charges and Mark-to-Market (\"MTM\") Adjustments", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RestructuringAndRelatedActivitiesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2201201 - Disclosure - Recently Issued Accounting Standards (Policies)", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsPolicies", "shortName": "Recently Issued Accounting Standards (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2301302 - Disclosure - Recently Issued Accounting Standards (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsTables", "shortName": "Recently Issued Accounting Standards (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2304301 - Disclosure - Revenue (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/RevenueTables", "shortName": "Revenue (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2307301 - Disclosure - Earnings Per Share (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/EarningsPerShareTables", "shortName": "Earnings Per Share (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "ual06301910q.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": "2309301 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossTables", "shortName": "Accumulated Other Comprehensive Income (Loss) (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2313301 - Disclosure - Employee Benefit Plans (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansTables", "shortName": "Employee Benefit Plans (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.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 - Financial Instruments and Fair Value Measurements (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsTables", "shortName": "Financial Instruments and Fair Value Measurements (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2323301 - Disclosure - Leases (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesTables", "shortName": "Leases (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LeaseCostTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LongTermPurchaseCommitmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2326301 - Disclosure - Commitments and Contingencies (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesTables", "shortName": "Commitments and Contingencies (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:LongTermPurchaseCommitmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1002000 - Statement - Statements of Consolidated Comprehensive Income (Unaudited)", "role": "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "shortName": "Statements of Consolidated Comprehensive Income (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:ScheduleOfDebtInstrumentsPassThroughTrustsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2327301 - Disclosure - Debt (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/DebtTables", "shortName": "Debt (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:ScheduleOfDebtInstrumentsPassThroughTrustsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2328301 - Disclosure - Special Charges and Mark-to-Market (\"MTM\") Adjustments (Tables)", "role": "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsTables", "shortName": "Special Charges and Mark-to-Market (\"MTM\") Adjustments (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AirlineCapacityPurchaseArrangements", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2401403 - Disclosure - Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Consolidated Operations (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "shortName": "Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Consolidated Operations (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2018Q2QTD_srt_RestatementAxis_srt_ScenarioPreviouslyReportedMember", "decimals": "-6", "lang": null, "name": "us-gaap:AirlineCapacityPurchaseArrangements", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:ReceivablesNetCurrent", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2401404 - Disclosure - Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Balance Sheet (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "shortName": "Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Balance Sheet (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2018Q4_srt_RestatementAxis_srt_ScenarioPreviouslyReportedMember", "decimals": "-6", "lang": null, "name": "us-gaap:ReceivablesNetCurrent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2401405 - Disclosure - Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Cash Flows (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "shortName": "Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Cash Flows (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2018Q2YTD_srt_RestatementAxis_srt_ScenarioPreviouslyReportedMember", "decimals": "-6", "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2404402 - Disclosure - Revenue - Operating Revenue by Geographic Region (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails", "shortName": "Revenue - Operating Revenue by Geographic Region (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD_us-gaap_AirlineDestinationsAxis_us-gaap_DomesticDestinationMember", "decimals": "-6", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2404403 - Disclosure - Revenue - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails", "shortName": "Revenue - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD_srt_ProductOrServiceAxis_ual_AdvanceTicketSalesMember", "decimals": "-8", "lang": null, "name": "us-gaap:ContractWithCustomerLiabilityRevenueRecognized", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q1_srt_ProductOrServiceAxis_ual_FrequentFlyerProgramMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:ContractWithCustomerLiability", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2404404 - Disclosure - Revenue - Roll Forward of Frequent Flyer Deferred Revenue (Details)", "role": "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails", "shortName": "Revenue - Roll Forward of Frequent Flyer Deferred Revenue (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q1_srt_ProductOrServiceAxis_ual_FrequentFlyerProgramMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:ContractWithCustomerLiability", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2407402 - Disclosure - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details)", "role": "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails", "shortName": "Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:TreasuryStockValueAcquiredCostMethod", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2407403 - Disclosure - Earnings Per Share - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails", "shortName": "Earnings Per Share - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD_us-gaap_ShareRepurchaseProgramAxis_ual_OpenMarketRepurchaseMember", "decimals": "-5", "lang": null, "name": "us-gaap:TreasuryStockSharesAcquired", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1003000 - Statement - Consolidated Balance Sheets (Unaudited)", "role": "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "shortName": "Consolidated Balance Sheets (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "lang": null, "name": "us-gaap:ShortTermInvestments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q1", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AociTaxAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2409402 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details)", "role": "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails", "shortName": "Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q1", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AociTaxAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "span", "span", "ix:continuation", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations", "reportCount": 1, "unique": true, "unitRef": "ratio", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2412401 - Disclosure - Income Taxes (Details)", "role": "http://www.unitedcontinentalholdings.com/role/IncomeTaxesDetails", "shortName": "Income Taxes (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "ix:continuation", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations", "reportCount": 1, "unique": true, "unitRef": "ratio", "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD_us-gaap_RetirementPlanTypeAxis_us-gaap_PensionPlansDefinedBenefitMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanServiceCost", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2413402 - Disclosure - Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details)", "role": "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails", "shortName": "Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD_us-gaap_RetirementPlanTypeAxis_us-gaap_PensionPlansDefinedBenefitMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:DefinedBenefitPlanServiceCost", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:DeterminationPeriodAverageClosingPrice", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2413403 - Disclosure - Employee Benefit Plans - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails", "shortName": "Employee Benefit Plans - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:DeterminationPeriodAverageClosingPrice", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AllocatedShareBasedCompensationExpense", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2413404 - Disclosure - Employee Benefit Plans - Information Related to Share-Based Compensation (Details)", "role": "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansInformationRelatedToShareBasedCompensationDetails", "shortName": "Employee Benefit Plans - Information Related to Share-Based Compensation (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "us-gaap:ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AllocatedShareBasedCompensationExpense", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NotesReceivableNet", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2416401 - Disclosure - BRW Term Loan (Details)", "role": "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails", "shortName": "BRW Term Loan (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NotesReceivableNet", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2419402 - Disclosure - Financial Instruments and Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)", "role": "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "shortName": "Financial Instruments and Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ual_AzulMember", "decimals": "2", "first": true, "lang": null, "name": "ual:EquitySecuritiesOwnershipPercentage", "reportCount": 1, "unique": true, "unitRef": "ratio", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2419403 - Disclosure - Financial Instruments and Fair Value Measurements - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "shortName": "Financial Instruments and Fair Value Measurements - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ual_AzulMember", "decimals": "2", "first": true, "lang": null, "name": "ual:EquitySecuritiesOwnershipPercentage", "reportCount": 1, "unique": true, "unitRef": "ratio", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_us-gaap_FairValueByMeasurementBasisAxis_us-gaap_CarryingReportedAmountFairValueDisclosureMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LongTermDebt", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2419404 - Disclosure - Financial Instruments and Fair Value Measurements - Carrying Values and Estimated Fair Values of Financial Instruments (Details)", "role": "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "shortName": "Financial Instruments and Fair Value Measurements - Carrying Values and Estimated Fair Values of Financial Instruments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_us-gaap_FairValueByMeasurementBasisAxis_us-gaap_CarryingReportedAmountFairValueDisclosureMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LongTermDebt", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:OperatingLeaseCost", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2423402 - Disclosure - Leases - Components of Lease Cost (Details)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails", "shortName": "Leases - Components of Lease Cost (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "ix:continuation", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:OperatingLeaseCost", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R5": { "firstAnchor": null, "groupType": "statement", "isDefault": "false", "longName": "1003501 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)", "role": "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "shortName": "Consolidated Balance Sheets (Unaudited) (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": null }, "R50": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "ual:LesseeOperatingAndFinanceLeaseNotYetCommencedAmount", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2423403 - Disclosure - Leases - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails", "shortName": "Leases - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "ual:LesseeOperatingAndFinanceLeaseNotYetCommencedAmount", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:FinanceLeaseLiabilityMaturityTableTextBlock", "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2423404 - Disclosure - Leases - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails", "shortName": "Leases - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:FinanceLeaseLiabilityMaturityTableTextBlock", "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2423405 - Disclosure - Leases - Additional Information Related to Leases (Details)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails", "shortName": "Leases - Additional Information Related to Leases (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OperatingLeaseWeightedAverageRemainingLeaseTerm1", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R53": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:OperatingLeasePayments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2423406 - Disclosure - Leases - Supplemental Cash Flow Information Related to Leases (Details)", "role": "http://www.unitedcontinentalholdings.com/role/LeasesSupplementalCashFlowInformationRelatedToLeasesDetails", "shortName": "Leases - Supplemental Cash Flow Information Related to Leases (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:OperatingLeasePayments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R54": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "INF", "first": true, "lang": null, "name": "ual:NumberOfAircraftsExpectedToTakeDeliveryYearTwo", "reportCount": 1, "unitRef": "Aircraft", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2426402 - Disclosure - Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "shortName": "Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_srt_AircraftTypeAxis_ual_AirbusMember", "decimals": "INF", "lang": null, "name": "us-gaap:UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired", "reportCount": 1, "unique": true, "unitRef": "commitment", "xsiNil": "false" } }, "R55": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:DebtInstrumentRemainingTerms", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2426403 - Disclosure - Commitments and Contingencies - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "shortName": "Commitments and Contingencies - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "ual:DebtInstrumentRemainingTerms", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R56": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-8", "first": true, "lang": null, "name": "us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2426404 - Disclosure - Commitments and Contingencies - Summary of Commitments (Details)", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails", "shortName": "Commitments and Contingencies - Summary of Commitments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-8", "first": true, "lang": null, "name": "us-gaap:UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R57": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-8", "first": true, "lang": null, "name": "us-gaap:ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2426405 - Disclosure - Commitments and Contingencies - Summary of the Expected Future Payments Through the End of the Terms of CPAs (Details)", "role": "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails", "shortName": "Commitments and Contingencies - Summary of the Expected Future Payments Through the End of the Terms of CPAs (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-8", "first": true, "lang": null, "name": "us-gaap:ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R58": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "D2019Q1FEB2019", "decimals": "INF", "first": true, "lang": null, "name": "ual:NumberPassThroughTrustsCreated", "reportCount": 1, "unique": true, "unitRef": "trust", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2427402 - Disclosure - Debt - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails", "shortName": "Debt - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "D2019Q1FEB2019", "decimals": "INF", "first": true, "lang": null, "name": "ual:NumberPassThroughTrustsCreated", "reportCount": 1, "unique": true, "unitRef": "trust", "xsiNil": "false" } }, "R59": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:ProceedsFromIssuanceOfLongTermDebt", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2427403 - Disclosure - Debt - Details of Pass Through Trusts (Details)", "role": "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "shortName": "Debt - Details of Pass Through Trusts (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_dei_LegalEntityAxis_ual_UnitedAirLinesIncMember_ual_PeriodAxis_ual_February2019Member_us-gaap_LongtermDebtTypeAxis_ual_ClassAAPassThroughCertificatesMember", "decimals": "INF", "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": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1004000 - Statement - Condensed Statements of Consolidated Cash Flows (Unaudited)", "role": "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "shortName": "Condensed Statements of Consolidated Cash Flows (Unaudited)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": "-6", "lang": null, "name": "us-gaap:PaymentsToAcquireInvestments", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R60": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_dei_LegalEntityAxis_ual_UalAndUnitedMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2427404 - Disclosure - Debt - Contractual Principal Payments (Details)", "role": "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "shortName": "Debt - Contractual Principal Payments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2_dei_LegalEntityAxis_ual_UalAndUnitedMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R61": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AssetImpairmentCharges", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2428402 - Disclosure - Special Charges and Mark-to-Market (\"MTM\") Adjustments - Components of Special Charges (Details)", "role": "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails", "shortName": "Special Charges and Mark-to-Market (\"MTM\") Adjustments - Components of Special Charges (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "us-gaap:ScheduleOfRestructuringAndRelatedCostsTextBlock", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:AssetImpairmentCharges", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R62": { "firstAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:GainLossOnTerminationOfLease", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "2428403 - Disclosure - Special Charges and Mark-to-Market (\"MTM\") Adjustments - Narrative (Details)", "role": "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails", "shortName": "Special Charges and Mark-to-Market (\"MTM\") Adjustments - Narrative (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2QTD", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:GainLossOnTerminationOfLease", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2019Q2", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1004501 - Statement - Condensed Statements of Consolidated Cash Flows (Unaudited) (Parenthetical)", "role": "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "shortName": "Condensed Statements of Consolidated Cash Flows (Unaudited) (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "ix:continuation", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2018Q2", "decimals": "-6", "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unique": true, "unitRef": "usd", "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2017Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "1005000 - Statement - Statements of Consolidated Stockholders' Equity", "role": "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity", "shortName": "Statements of Consolidated Stockholders' Equity", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FI2017Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "shares", "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.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 Accounting Standards", "role": "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandards", "shortName": "Recently Issued Accounting Standards", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "span", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "FD2019Q2YTD", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R9999": { "firstAnchor": { "ancestors": [ "span", "span", "div", "td", "tr", "table", "div", "div", "body", "html" ], "baseRef": "ual06301910q.htm", "contextRef": "I2018Q1Jan1_us-gaap_StatementEquityComponentsAxis_us-gaap_AccumulatedOtherComprehensiveIncomeMember", "decimals": "-6", "first": true, "lang": null, "name": "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption", "reportCount": 1, "unitRef": "usd", "xsiNil": "false" }, "groupType": "", "isDefault": "false", "longName": "Uncategorized Items - ual06301910q.htm", "role": "http://xbrl.sec.gov/role/uncategorizedFacts", "shortName": "Uncategorized Items - ual06301910q.htm", "subGroupType": "", "uniqueAnchor": null } }, "segmentCount": 85, "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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_CoverAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cover page." } } }, "localname": "CoverAbstract", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "xbrltype": "stringItemType" }, "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.unitedcontinentalholdings.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.unitedcontinentalholdings.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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "dei_DocumentQuarterlyReport": { "auth_ref": [ "r360" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_DocumentTransitionReport": { "auth_ref": [ "r361" ], "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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_EntitiesTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Container to assemble all relevant information about each entity associated with the document instance", "label": "Entities [Table]", "terseLabel": "Entities [Table]" } } }, "localname": "EntitiesTable", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "stringItemType" }, "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.unitedcontinentalholdings.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.unitedcontinentalholdings.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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "stateOrProvinceItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.", "label": "Entity [Domain]", "terseLabel": "Entity [Domain]" } } }, "localname": "EntityDomain", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r362" ], "lang": { "en-US": { "role": { "documentation": "Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated), (5) Smaller Reporting Accelerated Filer or (6) Smaller Reporting Company and Large 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.unitedcontinentalholdings.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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "edgarStateCountryItemType" }, "dei_EntityInformationFormerLegalOrRegisteredName": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Former Legal or Registered Name of an entity", "label": "Entity Information, Former Legal or Registered Name", "terseLabel": "Entity Information, Former Legal or Registered Name" } } }, "localname": "EntityInformationFormerLegalOrRegisteredName", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityInformationLineItems": { "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": "Entity Information [Line Items]", "terseLabel": "Entity Information [Line Items]" } } }, "localname": "EntityInformationLineItems", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "stringItemType" }, "dei_EntityInteractiveDataCurrent": { "auth_ref": [ "r364" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityNumberOfEmployees": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of persons employed by the Entity", "label": "Entity Number of Employees", "terseLabel": "Number of employees" } } }, "localname": "EntityNumberOfEmployees", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "decimalItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r362" ], "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "employerIdItemType" }, "dei_LegalEntityAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The set of legal entities associated with a report.", "label": "Legal Entity [Axis]", "terseLabel": "Legal Entity [Axis]" } } }, "localname": "LegalEntityAxis", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "stringItemType" }, "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.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_Security12bTitle": { "auth_ref": [ "r358" ], "lang": { "en-US": { "role": { "documentation": "Title of a 12(b) registered security.", "label": "Title of 12(b) Security", "terseLabel": "Title of 12(b) Security" } } }, "localname": "Security12bTitle", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "Security12bTitle@anonymousType" }, "dei_SecurityExchangeName": { "auth_ref": [ "r359" ], "lang": { "en-US": { "role": { "documentation": "Name of the Exchange on which a security is registered.", "label": "Security Exchange Name", "terseLabel": "Security Exchange Name" } } }, "localname": "SecurityExchangeName", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "edgarExchangeCodeItemType" }, "dei_TradingSymbol": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Trading symbol of an instrument as listed on an exchange.", "label": "Trading Symbol", "terseLabel": "Trading Symbol" } } }, "localname": "TradingSymbol", "nsuri": "http://xbrl.sec.gov/dei/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation" ], "xbrltype": "tradingSymbolItemType" }, "srt_AircraftTypeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of aircraft.", "label": "Aircraft Type [Axis]", "terseLabel": "Aircraft Type [Axis]" } } }, "localname": "AircraftTypeAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "stringItemType" }, "srt_AircraftTypeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Vehicle designed for flight.", "label": "Aircraft [Domain]", "terseLabel": "Aircraft [Domain]" } } }, "localname": "AircraftTypeMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "domainItemType" }, "srt_B777300Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "B-777-300 aircraft type.", "label": "B-777-300 [Member]", "terseLabel": "Boeing 777-300ER" } } }, "localname": "B777300Member", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "domainItemType" }, "srt_ContractualObligationFiscalYearMaturityScheduleTableTextBlock": { "auth_ref": [ "r363" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation.", "label": "Contractual Obligation, Fiscal Year Maturity [Table Text Block]", "terseLabel": "Summary of the Expected Future Payments Through the End of the Terms of CPAs" } } }, "localname": "ContractualObligationFiscalYearMaturityScheduleTableTextBlock", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "srt_CounterpartyNameAxis": { "auth_ref": [ "r47", "r102", "r366" ], "lang": { "en-US": { "role": { "documentation": "Information by name of counterparty. A counterparty is the other party that participates in a financial transaction. Examples include, but not limited to, the name of the financial institution.", "label": "Counterparty Name [Axis]", "terseLabel": "Counterparty Name [Axis]" } } }, "localname": "CounterpartyNameAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_EquityMethodInvesteeNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of investment, including named security. Excludes consolidated entity.", "label": "Investment, Name [Domain]", "terseLabel": "Investment, Name [Domain]" } } }, "localname": "EquityMethodInvesteeNameDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_ManagementMember": { "auth_ref": [ "r134", "r311" ], "lang": { "en-US": { "role": { "documentation": "Person or persons designated as part of management.", "label": "Management [Member]", "terseLabel": "Management" } } }, "localname": "ManagementMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_MaximumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Upper limit of the provided range.", "label": "Maximum [Member]", "terseLabel": "Maximum" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lower limit of the provided range.", "label": "Minimum [Member]", "terseLabel": "Minimum" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_ProductOrServiceAxis": { "auth_ref": [ "r133", "r204", "r207", "r349", "r350" ], "lang": { "en-US": { "role": { "documentation": "Information by product and service, or group of similar products and similar services.", "label": "Product and Service [Axis]", "terseLabel": "Product and Service [Axis]" } } }, "localname": "ProductOrServiceAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "stringItemType" }, "srt_ProductsAndServicesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Product or service, or a group of similar products or similar services.", "label": "Product and Service [Domain]", "terseLabel": "Product and Service [Domain]" } } }, "localname": "ProductsAndServicesDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.", "label": "Statistical Measurement [Axis]", "terseLabel": "Statistical Measurement [Axis]" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Statistical measurement. Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.", "label": "Statistical Measurement [Domain]", "terseLabel": "Statistical Measurement [Domain]" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_RepurchaseAgreementCounterpartyNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Named other party that participates in a financial transaction. Examples include, but not limited to, the name of the financial institution.", "label": "Counterparty Name [Domain]", "terseLabel": "Counterparty Name [Domain]" } } }, "localname": "RepurchaseAgreementCounterpartyNameDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_RestatementAdjustmentMember": { "auth_ref": [ "r109", "r111", "r112", "r113" ], "lang": { "en-US": { "role": { "documentation": "Effect of a correction of an error, other prior year adjustment, or application of a new accounting pronouncement on a financial statement line item or any per share amounts. The cumulative effect of the change on retained earnings or net assets in the statement of financial position would also be represented under this domain member.", "label": "Restatement Adjustment [Member]", "terseLabel": "Adjustments" } } }, "localname": "RestatementAdjustmentMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "domainItemType" }, "srt_RestatementAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by revision of previously issued financial statements.", "label": "Restatement [Axis]", "terseLabel": "Restatement [Axis]" } } }, "localname": "RestatementAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "stringItemType" }, "srt_RestatementDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revision of previously issued financial statements.", "label": "Restatement [Domain]", "terseLabel": "Restatement [Domain]" } } }, "localname": "RestatementDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioForecastMember": { "auth_ref": [ "r365" ], "lang": { "en-US": { "role": { "documentation": "Information reported for future period.", "label": "Forecast [Member]", "terseLabel": "Forecast" } } }, "localname": "ScenarioForecastMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioPreviouslyReportedMember": { "auth_ref": [ "r111", "r112", "r113" ], "lang": { "en-US": { "role": { "documentation": "Represents the amount as previously reported before the correction of an error or other adjustment.", "label": "Previously Reported [Member]", "terseLabel": "As Reported", "verboseLabel": "As Reported" } } }, "localname": "ScenarioPreviouslyReportedMember", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "domainItemType" }, "srt_ScenarioUnspecifiedDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Scenario reported, distinguishing information from actual fact. Includes, but is not limited to, pro forma and forecast. Excludes actual facts.", "label": "Scenario [Domain]", "terseLabel": "Scenario [Domain]" } } }, "localname": "ScenarioUnspecifiedDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis": { "auth_ref": [ "r143" ], "lang": { "en-US": { "role": { "documentation": "Information by name of investment, including named security. Excludes consolidated entity.", "label": "Investment, Name [Axis]", "terseLabel": "Investment, Name [Axis]" } } }, "localname": "ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_StatementScenarioAxis": { "auth_ref": [ "r183", "r313" ], "lang": { "en-US": { "role": { "documentation": "Information by scenario reported, distinguishing information from actual fact. Includes, but is not limited to, pro forma and forecast. Excludes actual facts.", "label": "Scenario [Axis]", "terseLabel": "Scenario [Axis]" } } }, "localname": "StatementScenarioAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_TitleOfIndividualAxis": { "auth_ref": [ "r134", "r311" ], "lang": { "en-US": { "role": { "documentation": "Information by title of individual or nature of relationship to individual or group of individuals.", "label": "Title of Individual [Axis]", "terseLabel": "Title of Individual [Axis]" } } }, "localname": "TitleOfIndividualAxis", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "srt_TitleOfIndividualWithRelationshipToEntityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Title of individual, or nature of relationship to individual or group of individuals.", "label": "Title of Individual [Domain]", "terseLabel": "Title of Individual [Domain]" } } }, "localname": "TitleOfIndividualWithRelationshipToEntityDomain", "nsuri": "http://fasb.org/srt/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_A4.875SeniorNotesDue2025Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "4.875% Senior Notes Due 2025 [Member]", "label": "4.875% Senior Notes Due 2025 [Member]", "terseLabel": "4.875% Senior Notes due 2025" } } }, "localname": "A4.875SeniorNotesDue2025Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_AOCIAttributableToParentBeforeTaxRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "AOCI Attributable To Parent, Before Tax [Roll Forward]", "label": "AOCI Attributable To Parent, Before Tax [Roll Forward]", "terseLabel": "Before Tax" } } }, "localname": "AOCIAttributableToParentBeforeTaxRollForward", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "ual_AOCIAttributableToParentTaxRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "AOCI Attributable To Parent, Tax [Roll Forward]", "label": "AOCI Attributable To Parent, Tax [Roll Forward]", "terseLabel": "Deferred Tax" } } }, "localname": "AOCIAttributableToParentTaxRollForward", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "ual_AdvanceTicketSalesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Advance Ticket Sales [Member]", "label": "Advance Ticket Sales [Member]", "terseLabel": "Advance ticket sales", "verboseLabel": "Advance Ticket Sales" } } }, "localname": "AdvanceTicketSalesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_AirbusA319sMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Airbus A319s [Member]", "label": "Airbus A319s [Member]", "terseLabel": "Airbus A319" } } }, "localname": "AirbusA319sMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_AirbusMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Airbus [Member]", "label": "Airbus [Member]", "terseLabel": "Airbus A350" } } }, "localname": "AirbusMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "domainItemType" }, "ual_AircraftEnginesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Aircraft Engines [Member]", "label": "Aircraft Engines [Member]", "terseLabel": "Aircraft Engines" } } }, "localname": "AircraftEnginesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_AircraftMortgageDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Aircraft Mortgage Debt [Member]", "label": "Aircraft Mortgage Debt [Member]", "terseLabel": "Aircraft Mortgage Debt" } } }, "localname": "AircraftMortgageDebtMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_AirlineCapacityPurchaseAgreementTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Airline, Capacity Purchase Agreement, Term", "label": "Airline, Capacity Purchase Agreement, Term", "terseLabel": "Term of capacity purchase agreement" } } }, "localname": "AirlineCapacityPurchaseAgreementTerm", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_AvailableForSaleInvestmentMaturityTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Available for Sale Investment Maturity Term", "label": "Available for Sale Investment Maturity Term", "terseLabel": "Available-for-sale securities remaining maturities" } } }, "localname": "AvailableForSaleInvestmentMaturityTerm", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_AzulMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Azul [Member]", "label": "Azul [Member]", "terseLabel": "Azul" } } }, "localname": "AzulMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_BRWAviationHoldingLLCAndBRWAviationLLCBRWMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "BRW Aviation Holding LLC and BRW Aviation LLC (\u201cBRW\u201d) [Member]", "label": "BRW Aviation Holding LLC And BRW Aviation LLC (\u201cBRW\u201d) [Member]", "terseLabel": "BRW" } } }, "localname": "BRWAviationHoldingLLCAndBRWAviationLLCBRWMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "domainItemType" }, "ual_Boeing737700Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Boeing 737-700 [Member]", "label": "Boeing 737-700 [Member]", "terseLabel": "Boeing 737-700" } } }, "localname": "Boeing737700Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_Boeing737MaxMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Boeing 737 Max", "label": "Boeing 737 Max [Member]", "terseLabel": "Boeing 737 MAX" } } }, "localname": "Boeing737MaxMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_Boeing787Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Boeing 787.", "label": "Boeing 787 [Member]", "terseLabel": "Boeing 787" } } }, "localname": "Boeing787Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "domainItemType" }, "ual_CapitalContributionsToParent": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Capital Contributions To Parent", "label": "Capital Contributions To Parent", "negatedLabel": "Dividend to UAL" } } }, "localname": "CapitalContributionsToParent", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "ual_CashFlowLeasesLesseeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Cash Flow, Leases, Lessee [Abstract]", "label": "Cash Flow, Leases, Lessee [Abstract]", "terseLabel": "Cash paid for amounts included in the measurement of lease liabilities:" } } }, "localname": "CashFlowLeasesLesseeAbstract", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSupplementalCashFlowInformationRelatedToLeasesDetails" ], "xbrltype": "stringItemType" }, "ual_ClassAAPassThroughCertificatesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Class A A Pass Through Certificates [Member]", "label": "Class A A Pass Through Certificates [Member]", "terseLabel": "Class AA Pass Through Certificates" } } }, "localname": "ClassAAPassThroughCertificatesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "domainItemType" }, "ual_ClassAPassThroughCertificatesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Class A Pass Through Certificates [Member]", "label": "Class A Pass Through Certificates [Member]", "terseLabel": "Class A Pass Through Certificates" } } }, "localname": "ClassAPassThroughCertificatesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "domainItemType" }, "ual_CommitmentsAndContingenciesLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commitments And Contingencies [Line Items]", "label": "Commitments and Contingencies [Line Items]", "terseLabel": "Commitments and Contingencies [Line Items]" } } }, "localname": "CommitmentsAndContingenciesLineItems", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_CommitmentsAndContingenciesTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commitments And Contingencies [Table]", "label": "Commitments and Contingencies [Table]", "terseLabel": "Commitments and Contingencies [Table]" } } }, "localname": "CommitmentsAndContingenciesTable", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_DebtInstrumentRemainingTerms": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Years remaining on debt instruments.", "label": "Debt Instrument Remaining Terms", "terseLabel": "Remaining term of debt" } } }, "localname": "DebtInstrumentRemainingTerms", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_DeterminationPeriodAverageClosingPrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The time period over which the stock closing prices are averaged to arrive at a per-share valuation for equity based awards such as Restricted Stock Units, Performance Share and other equity based awards.", "label": "Determination Period Average Closing Price", "terseLabel": "Number of days used to compute performance period average closing price of restricted stock units" } } }, "localname": "DeterminationPeriodAverageClosingPrice", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_EarningsLossPerShareLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Earnings Loss Per Share [Line Items]", "label": "Earnings Loss Per Share [Line Items]", "terseLabel": "Earnings Loss Per Share [Line Items]" } } }, "localname": "EarningsLossPerShareLineItems", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_EarningsLossPerShareTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Earnings Loss Per Share [Table]", "label": "Earnings Loss Per Share [Table]", "terseLabel": "Earnings Loss Per Share [Table]" } } }, "localname": "EarningsLossPerShareTable", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_EmbraerCRJ550Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Embraer CRJ-550 [Member]", "label": "Embraer CRJ-550 [Member]", "terseLabel": "Embraer CRJ-550" } } }, "localname": "EmbraerCRJ550Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_EmbraerE175Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Embraer E175 [Member]", "label": "Embraer E175 [Member]", "terseLabel": "Embraer E175" } } }, "localname": "EmbraerE175Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_EmbraerERJ145Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Embraer ERJ 145 [Member]", "label": "Embraer ERJ 145 [Member]", "terseLabel": "Embraer ERJ 145" } } }, "localname": "EmbraerERJ145Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "domainItemType" }, "ual_EquitySecuritiesOwnershipPercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equity Securities, Ownership Percentage", "label": "Equity Securities, Ownership Percentage", "terseLabel": "Equity stake" } } }, "localname": "EquitySecuritiesOwnershipPercentage", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "percentItemType" }, "ual_FairValueLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Fair Value [Line Items]", "label": "Fair Value [Line Items]", "terseLabel": "Fair Value [Line Items]" } } }, "localname": "FairValueLineItems", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_FairValueTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Fair Value [Table]", "label": "Fair Value [Table]", "terseLabel": "Fair Value [Table]" } } }, "localname": "FairValueTable", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_February2019Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "February 2019 [Member]", "label": "February 2019 [Member]", "terseLabel": "February 2019" } } }, "localname": "February2019Member", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "domainItemType" }, "ual_FinanceLeaseAssetsNumberOfAircraft": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Finance Lease Assets, Number Of Aircraft", "label": "Finance Lease Assets, Number Of Aircraft", "terseLabel": "Number of leased aircraft" } } }, "localname": "FinanceLeaseAssetsNumberOfAircraft", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "integerItemType" }, "ual_FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Finance Lease, Conversion From Operating Lease, Recorded Property, Plant, And Equipment", "label": "Finance Lease, Conversion From Operating Lease, Recorded Property, Plant, And Equipment", "terseLabel": "Operating lease conversions to finance lease" } } }, "localname": "FinanceLeaseConversionFromOperatingLeaseRecordedPropertyPlantAndEquipment", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "ual_FixedRateDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Fixed Rate Debt [Member]", "label": "Fixed Rate Debt [Member]", "terseLabel": "Fixed Rate Debt" } } }, "localname": "FixedRateDebtMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_FloatingRateDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Floating Rate Debt [Member]", "label": "Floating Rate Debt [Member]", "terseLabel": "Floating Rate Debt" } } }, "localname": "FloatingRateDebtMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_FrequentFlyerMileageMilesAwardedInPeriod": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Frequent flyer mileage miles awarded in period.", "label": "Frequent Flyer Mileage Miles Awarded in Period", "terseLabel": "Miles awarded" } } }, "localname": "FrequentFlyerMileageMilesAwardedInPeriod", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "monetaryItemType" }, "ual_FrequentFlyerProgramMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Frequent Flyer Program [Member]", "label": "Frequent Flyer Program [Member]", "terseLabel": "Frequent Flyer", "verboseLabel": "Frequent flyer deferred revenue" } } }, "localname": "FrequentFlyerProgramMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "domainItemType" }, "ual_GainLossOnFinancialInstrumentsNonOperating": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 2.0, "parentTag": "ual_SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Gain (Loss) On Financial Instruments, Non-Operating", "label": "Gain (Loss) On Financial Instruments, Non-Operating", "negatedTerseLabel": "Nonoperating MTM (gains) losses on financial instruments" } } }, "localname": "GainLossOnFinancialInstrumentsNonOperating", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "ual_GainLossOnSaleOfOtherAssetsAndOtherMiscellaneousCharges": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 3.0, "parentTag": "us-gaap_RestructuringSettlementAndImpairmentProvisions", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) on sale of other assets and other miscellaneous charges.", "label": "Gain (Loss) On Sale Of Other Assets And Other Miscellaneous Charges", "negatedLabel": "(Gains) losses on sale of assets and other special charges" } } }, "localname": "GainLossOnSaleOfOtherAssetsAndOtherMiscellaneousCharges", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "ual_IncomeTaxExpenseBenefitSpecialCharges": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 2.0, "parentTag": "ual_SpecialItemsNetOfIncomeTaxBenefits", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Income tax expense (benefit) special charges.", "label": "Income Tax Expense (Benefit) Special Charges", "terseLabel": "Income tax benefit" } } }, "localname": "IncomeTaxExpenseBenefitSpecialCharges", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "ual_InternationalBrotherhoodOfTeamstersMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "International Brotherhood of Teamsters.", "label": "International Brotherhood Of Teamsters [Member]", "terseLabel": "International Brotherhood of Teamsters" } } }, "localname": "InternationalBrotherhoodOfTeamstersMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_July2019ShareRepurchaseProgramMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "July 2019 Share Repurchase Program [Member]", "label": "July 2019 Share Repurchase Program [Member]", "terseLabel": "July 2019 Share Repurchase Program [Member]" } } }, "localname": "July2019ShareRepurchaseProgramMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_KingslandHoldingsLimitedMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Kingsland Holdings Limited [Member]", "label": "Kingsland Holdings Limited [Member]", "terseLabel": "Kingsland" } } }, "localname": "KingslandHoldingsLimitedMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_LesseeOperatingAndFinanceLeaseNotYetCommencedAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Lessee, Operating And Finance Lease, Not Yet Commenced, Amount", "label": "Lessee, Operating And Finance Lease, Not Yet Commenced, Amount", "terseLabel": "Additional leases that have not yet commenced" } } }, "localname": "LesseeOperatingAndFinanceLeaseNotYetCommencedAmount", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "ual_LesseeOperatingAndFinanceLeaseNotYetCommencedTermOfContract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lessee, Operating And Finance Lease, Not Yet Commenced, Term Of Contract", "label": "Lessee, Operating And Finance Lease, Not Yet Commenced, Term Of Contract", "terseLabel": "Lease terms of additional leases that have not yet commenced (up to)" } } }, "localname": "LesseeOperatingAndFinanceLeaseNotYetCommencedTermOfContract", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_LesseeOperatingAndFinanceLeasesTermOfContract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lessee, Operating And Finance Leases, Term Of Contract", "label": "Lessee, Operating And Finance Leases, Term Of Contract", "terseLabel": "Initial term of operating leases" } } }, "localname": "LesseeOperatingAndFinanceLeasesTermOfContract", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "durationItemType" }, "ual_LesseeOperatingAndFinanceLeasesTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lessee, Operating And Finance Leases [Text Block]", "label": "Lessee, Operating And Finance Leases [Text Block]", "terseLabel": "LEASES" } } }, "localname": "LesseeOperatingAndFinanceLeasesTextBlock", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/Leases" ], "xbrltype": "textBlockItemType" }, "ual_LesseeOperatingAndFinanceLeasesWeightedAverageAssumptionsTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lessee, Operating And Finance Leases, Weighted-Average Assumptions [Table Text Block]", "label": "Lessee, Operating And Finance Leases, Weighted-Average Assumptions [Table Text Block]", "terseLabel": "Additional Information Related to Leases" } } }, "localname": "LesseeOperatingAndFinanceLeasesWeightedAverageAssumptionsTableTextBlock", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesTables" ], "xbrltype": "textBlockItemType" }, "ual_LoansAndLeasesFromNonUSEntitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans And Leases From Non U.S Entities [Member]", "label": "Loans And Leases From Non U S Entities [Member]", "terseLabel": "Loans and Leases from Non-U.S. Entities" } } }, "localname": "LoansAndLeasesFromNonUSEntitiesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_LoansReceivableAggregateMaximumPaymentAndGuaranteeAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Aggregate Maximum Payment And Guarantee Amount", "label": "Loans Receivable, Aggregate Maximum Payment And Guarantee Amount", "terseLabel": "Aggregate maximum possible combined put payment and guarantee amount" } } }, "localname": "LoansReceivableAggregateMaximumPaymentAndGuaranteeAmount", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "ual_LoansReceivableAgreementPutOptionDepositReceipts": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Agreement, Put Option, Deposit Receipts", "label": "Loans Receivable, Agreement, Put Option, Deposit Receipts", "terseLabel": "Number of ADRs that may be put into United (in shares)" } } }, "localname": "LoansReceivableAgreementPutOptionDepositReceipts", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "sharesItemType" }, "ual_LoansReceivableAgreementPutOptions": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Agreement, Put Options", "label": "Loans Receivable, Agreement, Put Options", "terseLabel": "Number of shares that may be put to United (in shares)" } } }, "localname": "LoansReceivableAgreementPutOptions", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "sharesItemType" }, "ual_LoansReceivableAgreementSharesPledgedAsCollateral": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Agreement, Shares Pledged As Collateral", "label": "Loans Receivable, Agreement, Shares Pledged As Collateral", "terseLabel": "Number of shares pledged as collateral (in shares)" } } }, "localname": "LoansReceivableAgreementSharesPledgedAsCollateral", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "sharesItemType" }, "ual_LoansReceivableAgreementSharesPledgedAsCollateralImpliedValueEquivalentAmericanDepositoryReceipts": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Agreement, Shares Pledged As Collateral, American Depository Receipts", "label": "Loans Receivable, Agreement, Shares Pledged As Collateral, Implied Value Equivalent, American Depository Receipts", "terseLabel": "Implied value equivalent of shares pledged as collateral (in ADRs)" } } }, "localname": "LoansReceivableAgreementSharesPledgedAsCollateralImpliedValueEquivalentAmericanDepositoryReceipts", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "decimalItemType" }, "ual_LoansReceivableGuaranteeAndPayoutSharePriceAtFifthAnniversary": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Guarantee And Payout Share Price At Fifth Anniversary", "label": "Loans Receivable, Guarantee And Payout Share Price At Fifth Anniversary", "terseLabel": "Market price of common stock at fifth anniversary (in dollars per share)" } } }, "localname": "LoansReceivableGuaranteeAndPayoutSharePriceAtFifthAnniversary", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "perShareItemType" }, "ual_LoansReceivablePrincipalAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Loans Receivable, Principal Amount", "label": "Loans Receivable, Principal Amount", "terseLabel": "Loan amount" } } }, "localname": "LoansReceivablePrincipalAmount", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "monetaryItemType" }, "ual_MovementInContractWithCustomerLiabilityRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Movement In Contract With Customer Liability [Roll Forward]", "label": "Movement In Contract With Customer Liability [Roll Forward]", "terseLabel": "Frequent Flyer Deferred Revenue [Roll Forward]" } } }, "localname": "MovementInContractWithCustomerLiabilityRollForward", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "stringItemType" }, "ual_NonAircraftMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Non-Aircraft [Member]", "label": "Non-Aircraft [Member]", "terseLabel": "Non-Aircraft" } } }, "localname": "NonAircraftMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_NonTravelMilesRedemptionFrequentFlyerDeferredRevenue": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Non-travel miles redemption, frequent flyer deferred revenue.", "label": "Non-Travel Miles Redemption, Frequent Flyer Deferred Revenue", "negatedLabel": "Non-travel miles redeemed (Other operating revenue)" } } }, "localname": "NonTravelMilesRedemptionFrequentFlyerDeferredRevenue", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "monetaryItemType" }, "ual_NumberOfAircraftGroundedUnderEmergencyOrder": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircraft Grounded Under Emergency Order", "label": "Number Of Aircraft Grounded Under Emergency Order", "terseLabel": "Number of aircraft grounded under emergency order" } } }, "localname": "NumberOfAircraftGroundedUnderEmergencyOrder", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftOperatedUnderCapacityPurchaseAgreement": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircraft Operated Under Capacity Purchase Agreement", "label": "Number Of Aircraft Operated Under Capacity Purchase Agreement", "terseLabel": "Number of aircraft operated under CPA" } } }, "localname": "NumberOfAircraftOperatedUnderCapacityPurchaseAgreement", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftOrdered": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircraft Ordered", "label": "Number Of Aircraft Ordered", "terseLabel": "Number of aircraft ordered" } } }, "localname": "NumberOfAircraftOrdered", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftSubjectToFinanceLeases": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircraft Subject To Finance Leases", "label": "Number Of Aircraft Subject To Finance Leases", "terseLabel": "Number of aircraft subject to finance leases" } } }, "localname": "NumberOfAircraftSubjectToFinanceLeases", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftSubjectToOperatingLeases": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircraft Subject To Operating Leases", "label": "Number Of Aircraft Subject To Operating Leases", "terseLabel": "Number of aircraft subject to operating leases" } } }, "localname": "NumberOfAircraftSubjectToOperatingLeases", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftsExpectedToTakeDeliveryAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircrafts Expected To Take Delivery [Abstract]", "label": "Number Of Aircrafts Expected To Take Delivery [Abstract]", "terseLabel": "Scheduled Aircraft Deliveries" } } }, "localname": "NumberOfAircraftsExpectedToTakeDeliveryAbstract", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "stringItemType" }, "ual_NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircrafts Expected To Take Delivery, Remainder Of Year", "label": "Number Of Aircrafts Expected To Take Delivery, Remainder Of Year", "terseLabel": "Last Six Months of 2019" } } }, "localname": "NumberOfAircraftsExpectedToTakeDeliveryRemainderOfYear", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftsExpectedToTakeDeliveryThereafter": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircrafts Expected To Take Delivery, Thereafter", "label": "Number Of Aircrafts Expected To Take Delivery, Thereafter", "terseLabel": "After 2020" } } }, "localname": "NumberOfAircraftsExpectedToTakeDeliveryThereafter", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfAircraftsExpectedToTakeDeliveryYearTwo": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Aircrafts Expected To Take Delivery, Year Two", "label": "Number Of Aircrafts Expected To Take Delivery, Year Two", "terseLabel": "Number of aircrafts expected to be delivered in 2020", "verboseLabel": "2020" } } }, "localname": "NumberOfAircraftsExpectedToTakeDeliveryYearTwo", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfEmployeesVoluntarilySeparated": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Employees Voluntarily Separated", "label": "Number Of Employees Voluntarily Separated", "terseLabel": "Number of technicians and related employees electing to voluntarily separate from the Company" } } }, "localname": "NumberOfEmployeesVoluntarilySeparated", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfExpectedFlightsOperatedPerDayPriorToGroundingOrder": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Expected Flights Operated Per Day Prior To Grounding Order", "label": "Number Of Expected Flights Operated Per Day Prior To Grounding Order", "terseLabel": "Number of expected flights operating per day prior to grounding order" } } }, "localname": "NumberOfExpectedFlightsOperatedPerDayPriorToGroundingOrder", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberOfFlightsOperatedPerDay": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Flights Operated Per Day", "label": "Number Of Flights Operated Per Day", "terseLabel": "Number of flights operated using grounded aircraft" } } }, "localname": "NumberOfFlightsOperatedPerDay", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_NumberPassThroughTrustsCreated": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Pass-Through Trusts Created", "label": "Number Pass-Through Trusts Created", "terseLabel": "Number of pass-through trusts created" } } }, "localname": "NumberPassThroughTrustsCreated", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_OpenMarketRepurchaseMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Open Market Repurchase [Member]", "label": "Open Market Repurchase [Member]", "terseLabel": "Open Market Repurchase Program" } } }, "localname": "OpenMarketRepurchaseMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Other Comprehensive Income, Investments and Other, Net of Tax", "label": "Other Comprehensive Income, Investments and Other, Net of Tax", "terseLabel": "Investments and other" } } }, "localname": "OtherComprehensiveIncomeInvestmentsAndOtherNetOfTax", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "ual_OtherInvestmentsMeasuredAtNetAssetValueMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Other Investments Measured At Net Asset Value [Member]", "label": "Other Investments Measured At Net Asset Value [Member]", "terseLabel": "Other investments measured at net asset value (NAV)" } } }, "localname": "OtherInvestmentsMeasuredAtNetAssetValueMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Other Liabilities And Deferred Credits, Noncurrent", "label": "Other Liabilities And Deferred Credits, Noncurrent", "totalLabel": "Total other liabilities and deferred credits" } } }, "localname": "OtherLiabilitiesAndDeferredCreditsNoncurrent", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "ual_PassengerAncillaryFeesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Passenger - Ancillary Fees [Member]", "label": "Passenger - Ancillary Fees [Member]", "terseLabel": "Ancillary Fees" } } }, "localname": "PassengerAncillaryFeesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_PaymentsOfDividendsToParentCompany": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Payments of dividends to parent company.", "label": "Payments Of Dividends To Parent Company", "negatedLabel": "Dividend to UAL" } } }, "localname": "PaymentsOfDividendsToParentCompany", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "ual_PercentageOfEmployeesRepresentedByLaborOrganizations": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage of employees represented by labor organizations", "label": "Percentage Of Employees Represented By Labor Organizations", "terseLabel": "Percentage of employees represented by various U.S. labor organizations" } } }, "localname": "PercentageOfEmployeesRepresentedByLaborOrganizations", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "percentItemType" }, "ual_PerformanceBasedRestrictedStockUnitsRSUsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Performance-Based Restricted Stock Units (RSUs) [Member]", "label": "Performance-Based Restricted Stock Units (RSUs) [Member]", "terseLabel": "Performance-Based RSUs" } } }, "localname": "PerformanceBasedRestrictedStockUnitsRSUsMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_PeriodAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Period [Axis]", "label": "Period [Axis]", "terseLabel": "Period [Axis]" } } }, "localname": "PeriodAxis", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "stringItemType" }, "ual_PeriodDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Period [Domain]", "label": "Period [Domain]", "terseLabel": "Period [Domain]" } } }, "localname": "PeriodDomain", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "domainItemType" }, "ual_PurchaseObligationNumberOfAircraftPurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Purchase Obligation, Number Of Aircraft Purchased", "label": "Purchase Obligation, Number Of Aircraft Purchased", "terseLabel": "Number of aircraft purchased" } } }, "localname": "PurchaseObligationNumberOfAircraftPurchased", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "integerItemType" }, "ual_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodBeforeTax": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 1.0, "parentTag": "ual_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reclassification From Accumulated Other Comprehensive Income, To Retained Earnings Current Period, before Tax", "label": "Reclassification From Accumulated Other Comprehensive Income, To Retained Earnings Current Period, before Tax", "terseLabel": "Amounts reclassified to retained earnings" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodBeforeTax", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "ual_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reclassification from accumulated other comprehensive income, to retained earnings current period, net of tax.", "label": "Reclassification From Accumulated Other Comprehensive Income, To Retained Earnings Current Period, Net Of Tax", "totalLabel": "Amounts reclassified to retained earnings" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "ual_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodTax": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 2.0, "parentTag": "ual_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Reclassification From Accumulated Other Comprehensive Income To Retained Earnings, Current Period, Tax", "label": "Reclassification From Accumulated Other Comprehensive Income To Retained Earnings, Current Period, Tax", "negatedTerseLabel": "Amounts reclassified to retained earnings" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodTax", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "ual_RemainingProceedsFromBorrowings": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of borrowing capacity currently available under the debt instrument (initial borrowing capacity less the amount of proceeds received).", "label": "Remaining Proceeds From Borrowings", "terseLabel": "Remaining proceeds from issuance of certificates to be received in future periods" } } }, "localname": "RemainingProceedsFromBorrowings", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "monetaryItemType" }, "ual_RestrictedCashFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restricted Cash Fair Value Disclosure", "label": "Restricted Cash, Fair Value Disclosure", "verboseLabel": "Restricted cash" } } }, "localname": "RestrictedCashFairValueDisclosure", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "ual_RevenueFromContractWithCustomerLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "[Line Items] for Revenue From Contract With Customer [Table] [Table]", "label": "Revenue From Contract With Customer [Line Items]", "terseLabel": "Revenue From Contract With Customer [Line Items]" } } }, "localname": "RevenueFromContractWithCustomerLineItems", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_RevenueFromContractWithCustomerTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revenue From Contract With Customer [Table] [Table]", "label": "Revenue From Contract With Customer [Table]", "terseLabel": "Revenue From Contract With Customer [Table]" } } }, "localname": "RevenueFromContractWithCustomerTable", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails" ], "xbrltype": "stringItemType" }, "ual_ScheduleOfDebtInstrumentsPassThroughTrustsTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of Debt Instruments Pass Through Trusts", "label": "Schedule of Debt Instruments Pass Through Trusts [Table Text Block]", "terseLabel": "Details of Pass Through Trusts" } } }, "localname": "ScheduleOfDebtInstrumentsPassThroughTrustsTableTextBlock", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtTables" ], "xbrltype": "textBlockItemType" }, "ual_SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 1.0, "parentTag": "ual_SpecialItemsNetOfIncomeTaxBenefits", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Special Charges And Losses On Financial Instruments, Nonoperating, Before Tax", "label": "Special Charges And Losses On Financial Instruments, Non-Operating, Before Tax", "totalLabel": "Total special charges and MTM (gains) losses on financial instruments" } } }, "localname": "SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "ual_SpecialChargesFairValueAdjustmentWriteOffsAndImpairmentsOfAircraft": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Special Charges, Fair Value Adjustment, Write-Offs, And Impairments Of Aircraft", "label": "Special Charges, Fair Value Adjustment, Write-Offs, And Impairments Of Aircraft", "terseLabel": "Fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use" } } }, "localname": "SpecialChargesFairValueAdjustmentWriteOffsAndImpairmentsOfAircraft", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "ual_SpecialItemsNetOfIncomeTaxBenefits": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Total special items in the period.", "label": "Special Items Net of Income Tax Benefit(s)", "totalLabel": "Total special charges and MTM (gains) losses on financial instruments, net of income tax" } } }, "localname": "SpecialItemsNetOfIncomeTaxBenefits", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "ual_TaxExemptBondsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tax Exempt Bonds [Member]", "label": "Tax Exempt Bonds [Member]", "terseLabel": "Tax-Exempt Special Facilities Revenue Bonds" } } }, "localname": "TaxExemptBondsMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_TimeVestedRestrictedStockUnitsRSUsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Time-Vested Restricted Stock Units (RSUs) [Member]", "label": "Time-Vested Restricted Stock Units (RSUs) [Member]", "terseLabel": "Time-Vested RSUs" } } }, "localname": "TimeVestedRestrictedStockUnitsRSUsMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_TravelMilesRedemptionFrequentFlyerDeferredRevenue": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Travel miles redemption, frequent flyer deferred revenue.", "label": "Travel Miles Redemption, Frequent Flyer Deferred Revenue", "negatedLabel": "Travel miles redeemed (Passenger revenue)" } } }, "localname": "TravelMilesRedemptionFrequentFlyerDeferredRevenue", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "monetaryItemType" }, "ual_UalAndUnitedMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "UAL And United [Member]", "label": "UAL And United [Member]", "terseLabel": "UAL And United" } } }, "localname": "UalAndUnitedMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "domainItemType" }, "ual_UnitedAirLinesIncMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "United Airlines, Inc. [Member]", "label": "United Air Lines Inc [Member]", "terseLabel": "United Airlines, Inc." } } }, "localname": "UnitedAirLinesIncMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DocumentAndEntityInformation", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "ual_UsGovernmentAgenciesDebtSecuritiesAndOtherFixedIncomeSecuritiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Us Government Agencies Debt Securities and Other Fixed Income Securities [Member]", "label": "Us Government Agencies Debt Securities and Other Fixed Income Securities [Member]", "terseLabel": "U.S. Government and Other Securities" } } }, "localname": "UsGovernmentAgenciesDebtSecuritiesAndOtherFixedIncomeSecuritiesMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "ual_VariableAndShortTermLeaseCost": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": 2.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Variable And Short-Term Lease, Cost", "label": "Variable And Short-Term Lease, Cost", "terseLabel": "Variable and short-term lease cost" } } }, "localname": "VariableAndShortTermLeaseCost", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "ual_VoluntaryEarlyOutProgramMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Voluntary Early Out Program [Member]", "label": "Voluntary Early Out Program [Member]", "terseLabel": "Voluntary Early-Out Program" } } }, "localname": "VoluntaryEarlyOutProgramMember", "nsuri": "http://www.unitedcontinentalholdings.com/20190630", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "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": "Net of Tax" } } }, "localname": "AOCIAttributableToParentNetOfTaxRollForward", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "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_AccountingStandardsUpdate201602Member": { "auth_ref": [ "r292" ], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).", "label": "Accounting Standards Update 2016-02 [Member]", "terseLabel": "New Lease Standard" } } }, "localname": "AccountingStandardsUpdate201602Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "domainItemType" }, "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.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccountsPayableCurrent": { "auth_ref": [ "r32" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accounts Payable, Current", "terseLabel": "Accounts payable" } } }, "localname": "AccountsPayableCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": { "auth_ref": [ "r51", "r57", "r59", "r228", "r267" ], "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]", "verboseLabel": "Pension and Other Postretirement Liabilities" } } }, "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": { "auth_ref": [ "r30", "r169" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.", "label": "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment", "negatedLabel": "Less \u2014 Accumulated depreciation and amortization", "negatedTerseLabel": "Accumulated depreciation and amortization, owned and finance leases" } } }, "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember": { "auth_ref": [ "r48", "r49", "r50", "r57", "r59" ], "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": "Investments and Other" } } }, "localname": "AccumulatedNetUnrealizedInvestmentGainLossMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "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.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r54", "r56", "r57" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 6.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.", "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax", "terseLabel": "Accumulated other comprehensive loss" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "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.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r53", "r57", "r59", "r267" ], "lang": { "en-US": { "role": { "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.", "label": "AOCI Attributable to Parent [Member]", "terseLabel": "Accumulated Other Comprehensive Income (Loss)", "verboseLabel": "Accumulated Other Comprehensive Income (Loss)" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r19" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.", "label": "Additional Paid in Capital, Common Stock", "terseLabel": "Additional capital invested" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapitalMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.", "label": "Additional Paid-in Capital [Member]", "terseLabel": "Additional Capital Invested" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": { "auth_ref": [ "r108" ], "lang": { "en-US": { "role": { "documentation": "Information by new accounting pronouncement.", "label": "Adjustments for New Accounting Pronouncements [Axis]", "terseLabel": "Adjustments for New Accounting Pronouncements [Axis]" } } }, "localname": "AdjustmentsForNewAccountingPronouncementsAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": { "auth_ref": [ "r244", "r246", "r256", "r257" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.", "label": "APIC, Share-based Payment Arrangement, Increase for Cost Recognition", "terseLabel": "Stock settled share-based compensation" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_AircraftMaintenanceMaterialsAndRepairs": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 6.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Maintenance costs incurred and directly related to services rendered by an entity during the reporting period. Includes the cost of inspections and repairs, materials and routine maintenance costs for all aircraft and engines.", "label": "Aircraft Maintenance, Materials, and Repairs", "terseLabel": "Aircraft maintenance materials and outside repairs" } } }, "localname": "AircraftMaintenanceMaterialsAndRepairs", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AircraftRental": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 8.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Expenses incurred related to the lease of aircraft from outside third parties that are used in the entity's business operations.", "label": "Aircraft Rental", "terseLabel": "Aircraft rent" } } }, "localname": "AircraftRental", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AirlineCapacityPurchaseArrangements": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 3.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Costs incurred related to air services provided by third-party transportation companies, including regional affiliates.", "label": "Airline, Capacity Purchase Arrangements", "terseLabel": "Regional capacity purchase" } } }, "localname": "AirlineCapacityPurchaseArrangements", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AirlineDestinationDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Geographic areas as defined by the U.S. Department of Transportation.", "label": "Airline Destination [Domain]", "terseLabel": "Airline Destination [Domain]" } } }, "localname": "AirlineDestinationDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AirlineDestinationsAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information about airline-related information by geographic areas as defined by the U.S. Department of Transportation.", "label": "Airline Destinations [Axis]", "terseLabel": "Airline Destinations [Axis]" } } }, "localname": "AirlineDestinationsAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AirlineRelatedInventoryNet": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Net carrying amount, as of the balance sheet date, of expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers and freight.", "label": "Airline Related Inventory, Net", "terseLabel": "Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 \u2014 $387; 2018 \u2014 $412)" } } }, "localname": "AirlineRelatedInventoryNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AirlineRelatedInventoryValuationReserves": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.", "label": "Airline Related Inventory, Valuation Reserves", "terseLabel": "Obsolescence allowance for aircraft fuel, spare parts and supplies" } } }, "localname": "AirlineRelatedInventoryValuationReserves", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllocatedShareBasedCompensationExpense": { "auth_ref": [ "r246", "r252", "r255" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.", "label": "Share-based Payment Arrangement, Expense", "verboseLabel": "Share-based compensation expense" } } }, "localname": "AllocatedShareBasedCompensationExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansInformationRelatedToShareBasedCompensationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": { "auth_ref": [ "r24", "r136", "r144" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of allowance for credit loss on accounts receivable, classified as current.", "label": "Accounts Receivable, Allowance for Credit Loss, Current", "terseLabel": "Allowance for doubtful accounts" } } }, "localname": "AllowanceForDoubtfulAccountsReceivableCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_AociBeforeTaxAttributableToParent": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 1.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).", "label": "AOCI before Tax, Attributable to Parent", "periodEndLabel": "Balance", "periodStartLabel": "Balance" } } }, "localname": "AociBeforeTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AociTaxAttributableToParent": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 2.0, "parentTag": "us-gaap_StockholdersEquity", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent.", "label": "AOCI Tax, Attributable to Parent", "negatedPeriodEndLabel": "Balance", "negatedPeriodStartLabel": "Balance" } } }, "localname": "AociTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetBackedSecuritiesMember": { "auth_ref": [ "r141", "r219" ], "lang": { "en-US": { "role": { "documentation": "Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans.", "label": "Asset-backed Securities [Member]", "terseLabel": "Asset-backed securities", "verboseLabel": "Asset-Backed Securities" } } }, "localname": "AssetBackedSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AssetImpairmentCharges": { "auth_ref": [ "r93", "r166" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 1.0, "parentTag": "us-gaap_RestructuringSettlementAndImpairmentProvisions", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.", "label": "Asset Impairment Charges", "terseLabel": "Impairment of assets" } } }, "localname": "AssetImpairmentCharges", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_Assets": { "auth_ref": [ "r132", "r321", "r339" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "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.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets [Abstract]", "terseLabel": "ASSETS" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsCurrent": { "auth_ref": [ "r2", "r3", "r44" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets, Current", "totalLabel": "Total current assets" } } }, "localname": "AssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets, Current [Abstract]", "terseLabel": "Current assets:" } } }, "localname": "AssetsCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_AtlanticDestinationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Atlantic destinations determined principally based on geographic region as defined by the U.S. Department of Transportation.", "label": "Atlantic Destination [Member]", "terseLabel": "Atlantic" } } }, "localname": "AtlanticDestinationMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AvailableForSaleSecuritiesDebtSecurities": { "auth_ref": [ "r139", "r140", "r151" ], "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", "verboseLabel": "Enhanced equipment trust certificates (EETC)" } } }, "localname": "AvailableForSaleSecuritiesDebtSecurities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AwardTypeAxis": { "auth_ref": [ "r247", "r254" ], "lang": { "en-US": { "role": { "documentation": "Information by type of award under share-based payment arrangement.", "label": "Award Type [Axis]", "terseLabel": "Award Type" } } }, "localname": "AwardTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CargoAndFreightMember": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "Product transported between locations.", "label": "Cargo and Freight [Member]", "terseLabel": "Cargo" } } }, "localname": "CargoAndFreightMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_CarryingReportedAmountFairValueDisclosureMember": { "auth_ref": [ "r284", "r285" ], "lang": { "en-US": { "role": { "documentation": "Measured as reported on the statement of financial position (balance sheet).", "label": "Reported Value Measurement [Member]", "terseLabel": "Carrying Amount" } } }, "localname": "CarryingReportedAmountFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CashAndCashEquivalentsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash and Cash Equivalents [Abstract]", "terseLabel": "Reconciliation of cash, cash equivalents and restricted cash:" } } }, "localname": "CashAndCashEquivalentsAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r1", "r28", "r95" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical": { "order": 1.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.", "label": "Cash and Cash Equivalents, at Carrying Value", "terseLabel": "Cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashAndCashEquivalentsFairValueDisclosure": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value portion 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.", "label": "Cash and Cash Equivalents, Fair Value Disclosure", "verboseLabel": "Cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": { "auth_ref": [ "r91", "r95", "r99" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical": { "order": null, "parentTag": null, "root": true, "weight": null } }, "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, cash equivalents and restricted cash at end of the period", "periodStartLabel": "Cash, cash equivalents and restricted cash at beginning of the period", "totalLabel": "Total cash, cash equivalents and restricted cash" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": { "auth_ref": [ "r91", "r286" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. 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, Period Increase (Decrease), Including Exchange Rate Effect", "totalLabel": "Net increase in cash, cash equivalents and restricted cash" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]", "terseLabel": "Investing and Financing Activities Not Affecting Cash:" } } }, "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_CertificatesOfDepositMember": { "auth_ref": [ "r334" ], "lang": { "en-US": { "role": { "documentation": "Short to medium-term investment available at banks and savings and loan institutions where a customer agrees to lend money to the institution for a certain amount of time and is paid a predetermined rate of interest. Certificates of deposit (CD) are typically Federal Deposit Insurance Corporation (FDIC) insured.", "label": "Certificates of Deposit [Member]", "terseLabel": "CDARS", "verboseLabel": "Certificates of deposit placed through an account registry service (CDARS)" } } }, "localname": "CertificatesOfDepositMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r40", "r182", "r329", "r345" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 6.0, "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", "terseLabel": "Commitments and contingencies" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "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": [ "r181", "r184" ], "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.unitedcontinentalholdings.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]", "terseLabel": "Common Stock" } } }, "localname": "CommonStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r17" ], "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": "Common stock, par value (in dollars per share)" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r17" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.", "label": "Common Stock, Shares Authorized", "terseLabel": "Common shares, authorized (in shares)" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r17" ], "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", "terseLabel": "Common shares, issued (in shares)" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r17", "r192" ], "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", "periodEndLabel": "Balance (in shares)", "periodStartLabel": "Balance (in shares)", "terseLabel": "Common shares, outstanding (in shares)" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r17" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Common Stock, Value, Issued", "terseLabel": "Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 257,729,166 and 269,914,769 shares at June 30, 2019 and December 31, 2018, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CompensationAndEmployeeBenefitPlansTextBlock": { "auth_ref": [ "r209", "r212", "r243", "r258" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.", "label": "Compensation and Employee Benefit Plans [Text Block]", "terseLabel": "EMPLOYEE BENEFIT PLANS" } } }, "localname": "CompensationAndEmployeeBenefitPlansTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlans" ], "xbrltype": "textBlockItemType" }, "us-gaap_CompensationAndRetirementDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Retirement Benefits [Abstract]", "terseLabel": "Compensation and Retirement Disclosure [Abstract]" } } }, "localname": "CompensationAndRetirementDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ComprehensiveIncomeNetOfTax": { "auth_ref": [ "r62", "r64", "r65" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent", "totalLabel": "Total comprehensive income, net" } } }, "localname": "ComprehensiveIncomeNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNoteTextBlock": { "auth_ref": [ "r79" ], "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.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLoss" ], "xbrltype": "textBlockItemType" }, "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock": { "auth_ref": [ "r202" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of contract balances and changes in contract balances.", "label": "Contract with Customer, Asset and Liability [Table Text Block]", "terseLabel": "Roll Forward of Frequent Flyer Deferred Revenue" } } }, "localname": "ContractWithCustomerAssetAndLiabilityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ContractWithCustomerLiability": { "auth_ref": [ "r200", "r201", "r205" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.", "label": "Contract with Customer, Liability", "periodEndLabel": "Total Frequent flyer deferred revenue - ending balance", "periodStartLabel": "Total Frequent flyer deferred revenue - beginning balance" } } }, "localname": "ContractWithCustomerLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractWithCustomerLiabilityCurrent": { "auth_ref": [ "r200", "r201", "r205" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 7.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.", "label": "Contract with Customer, Liability, Current", "terseLabel": "Deferred revenue" } } }, "localname": "ContractWithCustomerLiabilityCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractWithCustomerLiabilityNoncurrent": { "auth_ref": [ "r200", "r201", "r205" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.", "label": "Contract with Customer, Liability, Noncurrent", "terseLabel": "Frequent flyer deferred revenue" } } }, "localname": "ContractWithCustomerLiabilityNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractWithCustomerLiabilityRevenueRecognized": { "auth_ref": [ "r206" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.", "label": "Contract with Customer, Liability, Revenue Recognized", "terseLabel": "Revenue recognized" } } }, "localname": "ContractWithCustomerLiabilityRevenueRecognized", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligation": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.", "label": "Contractual Obligation", "terseLabel": "Aggregate balance", "totalLabel": "Total" } } }, "localname": "ContractualObligation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationDueAfterFifthYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 6.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Contractual Obligation, Due after Fifth Year", "terseLabel": "After 2023" } } }, "localname": "ContractualObligationDueAfterFifthYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationDueInFifthYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 5.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Contractual Obligation, Due in Fifth Year", "terseLabel": "2023" } } }, "localname": "ContractualObligationDueInFifthYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationDueInFourthYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 4.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Contractual Obligation, Due in Fourth Year", "terseLabel": "2022" } } }, "localname": "ContractualObligationDueInFourthYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationDueInSecondYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 2.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Contractual Obligation, Due in Second Year", "terseLabel": "2020" } } }, "localname": "ContractualObligationDueInSecondYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationDueInThirdYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 3.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Contractual Obligation, Due in Third Year", "terseLabel": "2021" } } }, "localname": "ContractualObligationDueInThirdYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails": { "order": 1.0, "parentTag": "us-gaap_ContractualObligation", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of contractual obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.", "label": "Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year", "terseLabel": "Last six months of 2019" } } }, "localname": "ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfExpectedFuturePaymentsThroughEndOfTermsOfCpasDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CorporateDebtSecuritiesMember": { "auth_ref": [ "r219", "r241", "r351" ], "lang": { "en-US": { "role": { "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.", "label": "Corporate Debt Securities [Member]", "terseLabel": "Corporate Debt", "verboseLabel": "Corporate debt" } } }, "localname": "CorporateDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CostsAndExpenses": { "auth_ref": [ "r72" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 1.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Total costs of sales and operating expenses for the period.", "label": "Costs and Expenses", "totalLabel": "Total operating expenses" } } }, "localname": "CostsAndExpenses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_CostsAndExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Costs and Expenses [Abstract]", "terseLabel": "Operating expense:" } } }, "localname": "CostsAndExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_CreditFacilityAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.", "label": "Credit Facility [Axis]", "terseLabel": "Credit Facility [Axis]" } } }, "localname": "CreditFacilityAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CreditFacilityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.", "label": "Credit Facility [Domain]", "terseLabel": "Credit Facility [Domain]" } } }, "localname": "CreditFacilityDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.", "label": "Cumulative Effect of New Accounting Principle in Period of Adoption", "verboseLabel": "Adoption of accounting standard related to equity investments" } } }, "localname": "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "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_DebtInstrumentAxis": { "auth_ref": [ "r11", "r13", "r14", "r322", "r323", "r337" ], "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.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentCarryingAmount": { "auth_ref": [ "r14", "r189", "r323", "r337" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.", "label": "Long-term Debt, Gross", "terseLabel": "Total debt recorded" } } }, "localname": "DebtInstrumentCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentFaceAmount": { "auth_ref": [ "r289", "r291" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Face (par) amount of debt instrument at time of issuance.", "label": "Debt Instrument, Face Amount", "terseLabel": "Aggregate principal amount", "verboseLabel": "Face Amount" } } }, "localname": "DebtInstrumentFaceAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentInterestRateStatedPercentage": { "auth_ref": [ "r37" ], "lang": { "en-US": { "role": { "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.", "label": "Debt Instrument, Interest Rate, Stated Percentage", "terseLabel": "Interest rate", "verboseLabel": "Stated interest rate" } } }, "localname": "DebtInstrumentInterestRateStatedPercentage", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Debt Instrument [Line Items]", "terseLabel": "Debt Instrument [Line Items]" } } }, "localname": "DebtInstrumentLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentNameDomain": { "auth_ref": [ "r38" ], "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.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtInstrumentRedemptionPricePercentage": { "auth_ref": [ "r335" ], "lang": { "en-US": { "role": { "documentation": "Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.", "label": "Debt Instrument, Redemption Price, Percentage", "terseLabel": "Redemption price rate" } } }, "localname": "DebtInstrumentRedemptionPricePercentage", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentTable": { "auth_ref": [ "r38", "r103", "r193", "r194", "r195", "r196", "r288", "r289", "r291", "r336" ], "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.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Deferred Credits and Other Liabilities [Abstract]", "terseLabel": "Other liabilities and deferred credits:" } } }, "localname": "DeferredCreditsAndOtherLiabilitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_DeferredIncomeTaxLiabilitiesNet": { "auth_ref": [ "r259", "r262" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.", "label": "Deferred Income Tax Liabilities, Net", "terseLabel": "Deferred income taxes" } } }, "localname": "DeferredIncomeTaxLiabilitiesNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent": { "auth_ref": [ "r15", "r213", "r214", "r218" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.", "label": "Liability, Defined Benefit Pension Plan, Noncurrent", "terseLabel": "Pension liability" } } }, "localname": "DefinedBenefitPensionPlanLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses": { "auth_ref": [ "r225", "r237", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 4.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.", "label": "Defined Benefit Plan, Amortization of Gain (Loss)", "negatedTerseLabel": "Amortization of unrecognized (gain) loss" } } }, "localname": "DefinedBenefitPlanAmortizationOfGainsLosses", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit": { "auth_ref": [ "r226", "r238", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 5.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.", "label": "Defined Benefit Plan, Amortization of Prior Service Cost (Credit)", "terseLabel": "Amortization of prior service credit" } } }, "localname": "DefinedBenefitPlanAmortizationOfPriorServiceCostCredit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanContributionsByEmployer": { "auth_ref": [ "r217", "r219", "r220", "r240", "r241" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of contribution received by defined benefit plan from employer which increases plan assets.", "label": "Defined Benefit Plan, Plan Assets, Contributions by Employer", "terseLabel": "Employer contribution to tax-qualified defined benefit pension plans" } } }, "localname": "DefinedBenefitPlanContributionsByEmployer", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanDisclosureLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Benefit Plan Disclosure [Line Items]", "terseLabel": "Defined Benefit Plan Disclosure [Line Items]" } } }, "localname": "DefinedBenefitPlanDisclosureLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": { "auth_ref": [ "r224", "r236", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 3.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.", "label": "Defined Benefit Plan, Expected Return (Loss) on Plan Assets", "negatedLabel": "Expected return on plan assets" } } }, "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanInterestCost": { "auth_ref": [ "r216", "r223", "r235", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 2.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost recognized for passage of time related to defined benefit plan.", "label": "Defined Benefit Plan, Interest Cost", "verboseLabel": "Interest cost" } } }, "localname": "DefinedBenefitPlanInterestCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": { "auth_ref": [ "r221", "r233", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan.", "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit)", "totalLabel": "Total" } } }, "localname": "DefinedBenefitPlanNetPeriodicBenefitCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1": { "auth_ref": [ "r227", "r239" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 6.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.", "label": "Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement", "negatedLabel": "Settlement loss" } } }, "localname": "DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanServiceCost": { "auth_ref": [ "r215", "r222", "r234", "r241" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails": { "order": 1.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.", "label": "Defined Benefit Plan, Service Cost", "verboseLabel": "Service cost" } } }, "localname": "DefinedBenefitPlanServiceCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepositsOnFlightEquipment": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Carrying amount, at the balance sheet date, of deposits made to the manufacturer for new flight equipment still under construction. May include capitalized interest.", "label": "Deposits on Flight Equipment", "terseLabel": "Purchase deposits for flight equipment" } } }, "localname": "DepositsOnFlightEquipment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepreciationAndAmortization": { "auth_ref": [ "r93", "r167" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 5.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.", "label": "Depreciation, Depletion and Amortization, Nonproduction", "terseLabel": "Depreciation and amortization" } } }, "localname": "DepreciationAndAmortization", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeAssets": { "auth_ref": [ "r45", "r46", "r283" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.", "label": "Derivative Asset", "terseLabel": "AVH Derivative Assets" } } }, "localname": "DerivativeAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeLossOnDerivative": { "auth_ref": [ "r268" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of decrease in the fair value of derivatives recognized in the income statement.", "label": "Derivative, Loss on Derivative", "terseLabel": "Gain for the change in fair value of certain derivative assets" } } }, "localname": "DerivativeLossOnDerivative", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DisaggregationOfRevenueLineItems": { "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": "Disaggregation of Revenue [Line Items]", "terseLabel": "Disaggregation of Revenue [Line Items]" } } }, "localname": "DisaggregationOfRevenueLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails", "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Disaggregation of Revenue [Table]", "terseLabel": "Disaggregation of Revenue [Table]" } } }, "localname": "DisaggregationOfRevenueTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails", "http://www.unitedcontinentalholdings.com/role/RevenueRollForwardOfFrequentFlyerDeferredRevenueDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTableTextBlock": { "auth_ref": [ "r204" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Disaggregation of Revenue [Table Text Block]", "terseLabel": "Operating Revenue by Geographic Region" } } }, "localname": "DisaggregationOfRevenueTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_DomesticDestinationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Domestic destinations determined principally based on geographic region as defined by the U.S. Department of Transportation.", "label": "Domestic Destination [Member]", "terseLabel": "Domestic (U.S. and Canada)" } } }, "localname": "DomesticDestinationMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Earnings Per Share [Abstract]" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasic": { "auth_ref": [ "r70", "r109", "r118", "r120", "r121", "r122", "r124", "r332", "r347" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.", "label": "Earnings Per Share, Basic", "terseLabel": "Earnings per share, basic (in dollars per share)" } } }, "localname": "EarningsPerShareBasic", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareDiluted": { "auth_ref": [ "r70", "r109", "r118", "r120", "r121", "r122", "r124", "r332", "r347" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.", "label": "Earnings Per Share, Diluted", "terseLabel": "Earnings per share, diluted (in dollars per share)" } } }, "localname": "EarningsPerShareDiluted", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareTextBlock": { "auth_ref": [ "r125" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for earnings per share.", "label": "Earnings Per Share [Text Block]", "terseLabel": "EARNINGS PER SHARE" } } }, "localname": "EarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShare" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperations": { "auth_ref": [ "r104", "r260", "r261" ], "lang": { "en-US": { "role": { "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Effective Income Tax Rate Reconciliation, Percent", "terseLabel": "Effective income tax rate" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperations", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/IncomeTaxesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EmployeeRelatedLiabilitiesCurrent": { "auth_ref": [ "r35" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Employee-related Liabilities, Current", "terseLabel": "Accrued salaries and benefits" } } }, "localname": "EmployeeRelatedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Employee-related Liabilities [Abstract]" } } }, "localname": "EmployeeRelatedLiabilitiesCurrentAndNoncurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized": { "auth_ref": [ "r253" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost not yet recognized for nonvested award under share-based payment arrangement.", "label": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount", "verboseLabel": "Unrecognized share-based compensation" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansInformationRelatedToShareBasedCompensationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EnhancedEquipmentTrustCertificateMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A debt security that is separated into two or more distinct debt instruments, each with unique terms, issued by separate trusts that purchase equipment that is then leased to the entity. The revenue stream of the leased asset services the debt. When the trusts retire or otherwise satisfy the certificates, title to the asset will generally pass to the lessee. This form of financing, for example, is commonly used by, but not limited to, airlines and railroads for the purchase of aircraft or rolling stock, respectively.", "label": "Enhanced Equipment Trust Certificate [Member]", "terseLabel": "ETTC" } } }, "localname": "EnhancedEquipmentTrustCertificateMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Equity [Abstract]" } } }, "localname": "EquityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r192" ], "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.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_EquitySecuritiesFvNi": { "auth_ref": [ "r280" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).", "label": "Equity Securities, FV-NI", "verboseLabel": "Equity securities" } } }, "localname": "EquitySecuritiesFvNi", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EquitySecuritiesFvNiGainLoss": { "auth_ref": [ "r142" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).", "label": "Equity Securities, FV-NI, Gain (Loss)", "terseLabel": "Gain (loss) for the change in fair value of equity investments" } } }, "localname": "EquitySecuritiesFvNiGainLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_EstimateOfFairValueFairValueDisclosureMember": { "auth_ref": [ "r283" ], "lang": { "en-US": { "role": { "documentation": "Measured as an estimate of fair value.", "label": "Estimate of Fair Value Measurement [Member]", "terseLabel": "Fair Value" } } }, "localname": "EstimateOfFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]", "terseLabel": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]" } } }, "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": { "auth_ref": [ "r269", "r270", "r271", "r276" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain": { "auth_ref": [ "r274" ], "lang": { "en-US": { "role": { "documentation": "Class of asset.", "label": "Asset Class [Domain]", "terseLabel": "Asset Class [Domain]" } } }, "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByAssetClassAxis": { "auth_ref": [ "r269", "r276" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTable": { "auth_ref": [ "r269", "r284", "r285" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTextBlock": { "auth_ref": [ "r269", "r284" ], "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]", "verboseLabel": "Carrying Values and Estimated Fair Values of Financial Instruments" } } }, "localname": "FairValueByBalanceSheetGroupingTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r219", "r220", "r241", "r270", "r314" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementBasisAxis": { "auth_ref": [ "r269", "r277" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementFrequencyAxis": { "auth_ref": [ "r269", "r270", "r272", "r273", "r278" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "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": [ "r275" ], "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": "FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurements" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueInputsLevel1Member": { "auth_ref": [ "r219", "r220", "r241", "r270", "r315" ], "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]", "verboseLabel": "Level 1" } } }, "localname": "FairValueInputsLevel1Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r219", "r220", "r241", "r270", "r316" ], "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]", "verboseLabel": "Level 2" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueInputsLevel3Member": { "auth_ref": [ "r219", "r220", "r241", "r270", "r317" ], "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]", "verboseLabel": "Level 3" } } }, "localname": "FairValueInputsLevel3Member", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsRecurringMember": { "auth_ref": [ "r275", "r278" ], "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": "Measured on a Recurring Basis" } } }, "localname": "FairValueMeasurementsRecurringMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueOfFinancialInstrumentsPolicy": { "auth_ref": [ "r100", "r279", "r282" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for determining the fair value of financial instruments.", "label": "Fair Value of Financial Instruments, Policy [Policy Text Block]", "terseLabel": "Fair Value of Financial Instruments" } } }, "localname": "FairValueOfFinancialInstrumentsPolicy", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinanceLeaseInterestExpense": { "auth_ref": [ "r296", "r301", "r310" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": 4.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of interest expense on finance lease liability.", "label": "Finance Lease, Interest Expense", "terseLabel": "Interest on finance lease liabilities" } } }, "localname": "FinanceLeaseInterestExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseInterestPaymentOnLiability": { "auth_ref": [ "r298", "r304" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of interest paid on finance lease liability.", "label": "Finance Lease, Interest Payment on Liability", "terseLabel": "Operating cash flows for finance leases" } } }, "localname": "FinanceLeaseInterestPaymentOnLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSupplementalCashFlowInformationRelatedToLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Finance Lease, Liability, Payment, Due [Abstract]", "terseLabel": "Finance Leases" } } }, "localname": "FinanceLeaseLiabilitiesPaymentsDueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FinanceLeaseLiability": { "auth_ref": [ "r295", "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease.", "label": "Finance Lease, Liability", "totalLabel": "Present value of minimum lease payments" } } }, "localname": "FinanceLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityCurrent": { "auth_ref": [ "r295" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_FinanceLeaseLiability", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.", "label": "Finance Lease, Liability, Current", "negatedLabel": "Less: current maturities of lease obligations", "terseLabel": "Current maturities of finance leases" } } }, "localname": "FinanceLeaseLiabilityCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock": { "auth_ref": [ "r309" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position.", "label": "Finance Lease, Liability, Maturity [Table Text Block]", "terseLabel": "Summary of Scheduled Future Minimum Lease Payments under Finance Leases" } } }, "localname": "FinanceLeaseLiabilityMaturityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FinanceLeaseLiabilityNoncurrent": { "auth_ref": [ "r295" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_FinanceLeaseLiability", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.", "label": "Finance Lease, Liability, Noncurrent", "terseLabel": "Long-term obligations under finance leases", "verboseLabel": "Long-term lease obligations" } } }, "localname": "FinanceLeaseLiabilityNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDue": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease.", "label": "Finance Lease, Liability, Payment, Due", "totalLabel": "Minimum lease payments" } } }, "localname": "FinanceLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 6.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year.", "label": "Finance Lease, Liability, Payments, Due after Year Five", "terseLabel": "After 2023" } } }, "localname": "FinanceLeaseLiabilityPaymentsDueAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 5.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year.", "label": "Finance Lease, Liability, Payments, Due Year Five", "terseLabel": "2023" } } }, "localname": "FinanceLeaseLiabilityPaymentsDueYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 4.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.", "label": "Finance Lease, Liability, Payments, Due Year Four", "terseLabel": "2022" } } }, "localname": "FinanceLeaseLiabilityPaymentsDueYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 3.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.", "label": "Finance Lease, Liability, Payments, Due Year Three", "terseLabel": "2021" } } }, "localname": "FinanceLeaseLiabilityPaymentsDueYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 2.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.", "label": "Finance Lease, Liability, Payments, Due Year Two", "terseLabel": "2020" } } }, "localname": "FinanceLeaseLiabilityPaymentsDueYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 1.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.", "label": "Finance Lease, Liability, Payments, Remainder of Fiscal Year", "terseLabel": "Last six months of 2019" } } }, "localname": "FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.", "label": "Finance Lease, Liability, Undiscounted Excess Amount", "terseLabel": "Imputed interest" } } }, "localname": "FinanceLeaseLiabilityUndiscountedExcessAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeasePrincipalPayments": { "auth_ref": [ "r297", "r304" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 4.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow for principal payment on finance lease.", "label": "Finance Lease, Principal Payments", "negatedLabel": "Principal payments under finance leases", "terseLabel": "Financing cash flows for finance leases" } } }, "localname": "FinanceLeasePrincipalPayments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesSupplementalCashFlowInformationRelatedToLeasesDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseRightOfUseAssetAmortization": { "auth_ref": [ "r296", "r301", "r310" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": 3.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense attributable to right-of-use asset from finance lease.", "label": "Finance Lease, Right-of-Use Asset, Amortization", "terseLabel": "Amortization of finance lease assets" } } }, "localname": "FinanceLeaseRightOfUseAssetAmortization", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent": { "auth_ref": [ "r307", "r310" ], "lang": { "en-US": { "role": { "documentation": "Weighted average discount rate for finance lease calculated at point in time.", "label": "Finance Lease, Weighted Average Discount Rate, Percent", "terseLabel": "Weighted-average discount rate - finance leases" } } }, "localname": "FinanceLeaseWeightedAverageDiscountRatePercent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1": { "auth_ref": [ "r306", "r310" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Finance Lease, Weighted Average Remaining Lease Term", "terseLabel": "Weighted-average remaining lease term - finance leases" } } }, "localname": "FinanceLeaseWeightedAverageRemainingLeaseTerm1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "durationItemType" }, "us-gaap_FinancialInstrumentAxis": { "auth_ref": [ "r145", "r146", "r147", "r148", "r150", "r152", "r153", "r154", "r155" ], "lang": { "en-US": { "role": { "documentation": "Information by type of financial instrument.", "label": "Financial Instrument [Axis]", "terseLabel": "Financial Instrument [Axis]" } } }, "localname": "FinancialInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization": { "auth_ref": [ "r163" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite-Lived Intangible Assets, Accumulated Amortization", "terseLabel": "Accumulated amortization on intangibles" } } }, "localname": "FiniteLivedIntangibleAssetsAccumulatedAmortization", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r159", "r160", "r163", "r164", "r319" ], "lang": { "en-US": { "role": { "documentation": "Information by major type or class of finite-lived intangible assets.", "label": "Finite-Lived Intangible Assets by Major Class [Axis]", "terseLabel": "Finite-Lived Intangible Assets by Major Class [Axis]" } } }, "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r159", "r162" ], "lang": { "en-US": { "role": { "documentation": "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.", "label": "Finite-Lived Intangible Assets, Major Class Name [Domain]", "terseLabel": "Finite-Lived Intangible Assets, Major Class Name [Domain]" } } }, "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FixedIncomeSecuritiesMember": { "auth_ref": [ "r219", "r241" ], "lang": { "en-US": { "role": { "documentation": "Investment that provides a return in the form of fixed periodic payments and eventual return of principal at maturity.", "label": "Fixed Income Securities [Member]", "terseLabel": "Other Fixed-Income Securities", "verboseLabel": "Other fixed-income securities" } } }, "localname": "FixedIncomeSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FlightEquipmentGross": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The gross amount of long-lived, depreciable flight assets used in the entity's principle business operations, including owned aircraft and on capital lease, as well as capitalized improvements.", "label": "Flight Equipment, Gross", "terseLabel": "Flight equipment", "verboseLabel": "Flight equipment, owned and finance leases" } } }, "localname": "FlightEquipmentGross", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FuelCosts": { "auth_ref": [ "r73" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 2.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.", "label": "Fuel Costs", "terseLabel": "Aircraft fuel" } } }, "localname": "FuelCosts", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainLossOnTerminationOfLease": { "auth_ref": [ "r293" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) on termination of lease before expiration of lease term.", "label": "Gain (Loss) on Termination of Lease", "negatedTerseLabel": "Early lease termination charge" } } }, "localname": "GainLossOnTerminationOfLease", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_Goodwill": { "auth_ref": [ "r156", "r157" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_OtherAssetsNoncurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill", "terseLabel": "Goodwill" } } }, "localname": "Goodwill", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_GuaranteeObligationsCurrentCarryingValue": { "auth_ref": [ "r186" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.", "label": "Guarantor Obligations, Current Carrying Value", "terseLabel": "Liability for the fair value of guarantees" } } }, "localname": "GuaranteeObligationsCurrentCarryingValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GuaranteeObligationsMaximumExposure": { "auth_ref": [ "r185" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.", "label": "Guarantor Obligations, Maximum Exposure, Undiscounted", "terseLabel": "Aggregate principal amount of guarantee" } } }, "localname": "GuaranteeObligationsMaximumExposure", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill": { "auth_ref": [ "r93", "r165" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.", "label": "Impairment of Intangible Assets (Excluding Goodwill)", "terseLabel": "Write off of intangible asset" } } }, "localname": "ImpairmentOfIntangibleAssetsExcludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": { "auth_ref": [ "r68", "r109", "r320", "r330", "r348" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 1.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.", "label": "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest", "totalLabel": "Income before income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "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_IncomeTaxDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Income Tax Disclosure [Abstract]" } } }, "localname": "IncomeTaxDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxDisclosureTextBlock": { "auth_ref": [ "r265" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.", "label": "Income Tax Disclosure [Text Block]", "terseLabel": "INCOME TAXES" } } }, "localname": "IncomeTaxDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/IncomeTaxes" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxExpenseBenefit": { "auth_ref": [ "r101", "r131", "r264" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 2.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Income Tax Expense (Benefit)", "terseLabel": "Income tax expense" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "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.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements": { "auth_ref": [ "r119", "r123" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails": { "order": 2.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.", "label": "Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements", "terseLabel": "Effect of employee stock awards (in shares)" } } }, "localname": "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_IntangibleAssetsNetExcludingGoodwill": { "auth_ref": [ "r158", "r161" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_OtherAssetsNoncurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.", "label": "Intangible Assets, Net (Excluding Goodwill)", "terseLabel": "Intangibles, less accumulated amortization (2019 \u2014 $1,410; 2018 \u2014 $1,380)" } } }, "localname": "IntangibleAssetsNetExcludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestCostsCapitalizedAdjustment": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 2.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.", "label": "Interest Costs Capitalized Adjustment", "terseLabel": "Interest capitalized" } } }, "localname": "InterestCostsCapitalizedAdjustment", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpense": { "auth_ref": [ "r67", "r130", "r287", "r290", "r333" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 1.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "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", "negatedLabel": "Interest expense" } } }, "localname": "InterestExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentIncomeInterest": { "auth_ref": [ "r76", "r129" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 3.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.", "label": "Investment Income, Interest", "terseLabel": "Interest income" } } }, "localname": "InvestmentIncomeInterest", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentTypeAxis": { "auth_ref": [ "r353", "r354", "r355", "r356" ], "lang": { "en-US": { "role": { "documentation": "Information by type of investments.", "label": "Investment Type [Axis]", "terseLabel": "Investment Type [Axis]" } } }, "localname": "InvestmentTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InvestmentTypeCategorizationMember": { "auth_ref": [ "r353", "r354", "r355", "r356" ], "lang": { "en-US": { "role": { "documentation": "Asset obtained to generate income or appreciate in value.", "label": "Investments [Domain]", "terseLabel": "Investments [Domain]" } } }, "localname": "InvestmentTypeCategorizationMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InvestmentsAndOtherNoncurrentAssets": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "us-gaap_OtherAssetsNoncurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investments, and noncurrent assets classified as other.", "label": "Investments and Other Noncurrent Assets", "terseLabel": "Investments in affiliates and other, net" } } }, "localname": "InvestmentsAndOtherNoncurrentAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentsFairValueDisclosure": { "auth_ref": [ "r269" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.", "label": "Investments, Fair Value Disclosure", "terseLabel": "Short-term investments" } } }, "localname": "InvestmentsFairValueDisclosure", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LaborAndRelatedExpense": { "auth_ref": [ "r71" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 1.0, "parentTag": "us-gaap_CostsAndExpenses", "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", "terseLabel": "Salaries and related costs" } } }, "localname": "LaborAndRelatedExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LandingFeesAndOtherRentals": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 4.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Direct costs incurred at airports in which the entity conducts flight operations. The costs primarily consist of fees paid to the airport authority for takeoff and landing, gate space and facilities, allocations of common space such as security and other terminal costs and fuel storage facilities.", "label": "Landing Fees and Other Rentals", "terseLabel": "Landing fees and other rent" } } }, "localname": "LandingFeesAndOtherRentals", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LatinAmericaDestinationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Latin America destinations determined principally based on geographic region as defined by the U.S. Department of Transportation.", "label": "Latin America Destination [Member]", "terseLabel": "Latin America" } } }, "localname": "LatinAmericaDestinationMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LeaseCost": { "auth_ref": [ "r308", "r310" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of lease cost recognized by lessee for lease contract.", "label": "Lease, Cost", "totalLabel": "Total lease cost" } } }, "localname": "LeaseCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LeaseCostTableTextBlock": { "auth_ref": [ "r308" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.", "label": "Lease, Cost [Table Text Block]", "terseLabel": "Components of Lease Cost" } } }, "localname": "LeaseCostTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LeasesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Leases [Abstract]" } } }, "localname": "LeasesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Lessee, Lease, Description [Line Items]", "terseLabel": "Lessee, Lease, Description [Line Items]" } } }, "localname": "LesseeLeaseDescriptionLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeLeaseDescriptionTable": { "auth_ref": [ "r300" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about lessee's leases.", "label": "Lessee, Lease, Description [Table]", "terseLabel": "Lessee, Lease, Description [Table]" } } }, "localname": "LesseeLeaseDescriptionTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails", "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock": { "auth_ref": [ "r309" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.", "label": "Lessee, Operating Lease, Liability, Maturity [Table Text Block]", "terseLabel": "Summary of Scheduled Future Minimum Lease Payments under Operating Leases" } } }, "localname": "LesseeOperatingLeaseLiabilityMaturityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease.", "label": "Lessee, Operating Lease, Liability, Payments, Due", "totalLabel": "Minimum lease payments" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 6.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due after Year Five", "terseLabel": "After 2023" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 5.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Five", "terseLabel": "2023" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 4.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Four", "terseLabel": "2022" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 3.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Three", "terseLabel": "2021" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Due Year Two", "terseLabel": "2020" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.", "label": "Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year", "terseLabel": "Last six months of 2019" } } }, "localname": "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": { "auth_ref": [ "r309" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 1.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.", "label": "Lessee, Operating Lease, Liability, Undiscounted Excess Amount", "terseLabel": "Imputed interest" } } }, "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r23", "r324", "r342" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "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 stockholders' equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities and Equity [Abstract]", "terseLabel": "LIABILITIES AND STOCKHOLDERS' EQUITY" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesCurrent": { "auth_ref": [ "r36" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.", "label": "Liabilities, Current", "totalLabel": "Total current liabilities" } } }, "localname": "LiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities, Current [Abstract]", "terseLabel": "Current liabilities:" } } }, "localname": "LiabilitiesCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity": { "auth_ref": [ "r33" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).", "label": "Line of Credit Facility, Remaining Borrowing Capacity", "terseLabel": "Available under revolving credit facility" } } }, "localname": "LineOfCreditFacilityRemainingBorrowingCapacity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock": { "auth_ref": [ "r138" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.", "label": "Loans, Notes, Trade and Other Receivables Disclosure [Text Block]", "terseLabel": "BRW TERM LOAN" } } }, "localname": "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoan" ], "xbrltype": "textBlockItemType" }, "us-gaap_LongTermDebt": { "auth_ref": [ "r14", "r190", "r323", "r340" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long-term Debt", "terseLabel": "Long-term debt", "totalLabel": "Long-term debt", "verboseLabel": "Debt" } } }, "localname": "LongTermDebt", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails", "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtCurrent": { "auth_ref": [ "r34" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long-term Debt, Current Maturities", "terseLabel": "Current maturities of long-term debt" } } }, "localname": "LongTermDebtCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtFairValue": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The fair value amount of long-term debt 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.", "label": "Long-term Debt, Fair Value", "terseLabel": "Long-term debt" } } }, "localname": "LongTermDebtFairValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive": { "auth_ref": [ "r107", "r187" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 6.0, "parentTag": "us-gaap_LongTermDebt", "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 fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal after Year Five", "terseLabel": "After 2023" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive": { "auth_ref": [ "r107", "r187" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 5.0, "parentTag": "us-gaap_LongTermDebt", "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 fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal in Year Five", "terseLabel": "2023" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour": { "auth_ref": [ "r107", "r187" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 4.0, "parentTag": "us-gaap_LongTermDebt", "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 fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal in Year Four", "terseLabel": "2022" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree": { "auth_ref": [ "r107", "r187" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 3.0, "parentTag": "us-gaap_LongTermDebt", "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 fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal in Year Three", "terseLabel": "2021" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo": { "auth_ref": [ "r107", "r187" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 2.0, "parentTag": "us-gaap_LongTermDebt", "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 fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal in Year Two", "terseLabel": "2020" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear": { "auth_ref": [ "r107" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails": { "order": 1.0, "parentTag": "us-gaap_LongTermDebt", "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 remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year", "terseLabel": "Last six months of 2019" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtContractualPrincipalPaymentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtNoncurrent": { "auth_ref": [ "r38" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long-term Debt, Excluding Current Maturities", "terseLabel": "Long-term debt" } } }, "localname": "LongTermDebtNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtTextBlock": { "auth_ref": [ "r191" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for long-term debt.", "label": "Long-term Debt [Text Block]", "terseLabel": "DEBT" } } }, "localname": "LongTermDebtTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/Debt" ], "xbrltype": "textBlockItemType" }, "us-gaap_LongTermPurchaseCommitmentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Long-term Purchase Commitment [Line Items]", "terseLabel": "Long-term Purchase Commitment [Line Items]" } } }, "localname": "LongTermPurchaseCommitmentLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongTermPurchaseCommitmentTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule setting forth key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount.", "label": "Long-term Purchase Commitment [Table]", "terseLabel": "Long-term Purchase Commitment [Table]" } } }, "localname": "LongTermPurchaseCommitmentTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongTermPurchaseCommitmentTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount.", "label": "Long-term Purchase Commitment [Table Text Block]", "terseLabel": "Firm Commitments and Options to Purchase Aircraft and Summary of Commitments" } } }, "localname": "LongTermPurchaseCommitmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_LongtermDebtTypeAxis": { "auth_ref": [ "r38" ], "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.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongtermDebtTypeDomain": { "auth_ref": [ "r38", "r188" ], "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.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MainlineMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Significant, primary, generally longer routes of a carrier that it operates under its own brand, depart from or arrive to major cities or destinations, which are not defined by the entity as regional.", "label": "Mainline [Member]", "terseLabel": "Mainline Aircraft" } } }, "localname": "MainlineMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r91" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 3.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "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 financing activities" } } }, "localname": "NetCashProvidedByUsedInFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]", "terseLabel": "Cash Flows from Financing Activities:" } } }, "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r91" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 2.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "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 used in investing activities" } } }, "localname": "NetCashProvidedByUsedInInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]", "terseLabel": "Cash Flows from Investing Activities:" } } }, "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r91", "r92", "r94" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 1.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "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", "terseLabel": "Net cash provided by operating activities" } } }, "localname": "NetCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]", "terseLabel": "Cash Flows from Operating Activities:" } } }, "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r60", "r63", "r69", "r94", "r123", "r331", "r346" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited": { "order": 1.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.", "label": "Net Income (Loss) Attributable to Parent", "terseLabel": "Net income", "totalLabel": "Net income", "verboseLabel": "Net income" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": { "auth_ref": [ "r109", "r116" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.", "label": "Net Income (Loss) Available to Common Stockholders, Basic", "terseLabel": "Earnings available to common stockholders" } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersBasic", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" ], "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": [ "r114" ], "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 ACCOUNTING STANDARDS" } } }, "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandards" ], "xbrltype": "textBlockItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": { "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": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]", "terseLabel": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": { "auth_ref": [ "r108", "r110" ], "lang": { "en-US": { "role": { "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.", "label": "New Accounting Pronouncements or Change in Accounting Principle [Table]", "terseLabel": "New Accounting Pronouncements or Change in Accounting Principle [Table]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "stringItemType" }, "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": "Recently Issued Accounting Standards" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1": { "auth_ref": [ "r96", "r97", "r98" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.", "label": "Noncash or Part Noncash Acquisition, Fixed Assets Acquired", "terseLabel": "Property and equipment acquired through the issuance of debt" } } }, "localname": "NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NonoperatingIncomeExpense": { "auth_ref": [ "r77" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 2.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).", "label": "Nonoperating Income (Expense)", "totalLabel": "Total nonoperating expense, net" } } }, "localname": "NonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NonoperatingIncomeExpenseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Nonoperating Income (Expense) [Abstract]", "terseLabel": "Nonoperating income (expense):" } } }, "localname": "NonoperatingIncomeExpenseAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_NotesAndLoansReceivableNetNoncurrent": { "auth_ref": [ "r18" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "us-gaap_OtherAssetsNoncurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after allowance for credit loss, of financing receivable, classified as noncurrent.", "label": "Financing Receivable, after Allowance for Credit Loss, Noncurrent", "terseLabel": "Notes receivable, net" } } }, "localname": "NotesAndLoansReceivableNetNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_NotesReceivableNet": { "auth_ref": [ "r18", "r135", "r149" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.", "label": "Financing Receivable, after Allowance for Credit Loss", "terseLabel": "Carrying amount of loan receivable" } } }, "localname": "NotesReceivableNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Operating Expenses [Abstract]", "terseLabel": "Operating:" } } }, "localname": "OperatingExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingIncomeLoss": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 1.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net result for the period of deducting operating expenses from operating revenues.", "label": "Operating Income (Loss)", "totalLabel": "Operating income" } } }, "localname": "OperatingIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseCost": { "auth_ref": [ "r302", "r310" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": 1.0, "parentTag": "us-gaap_LeaseCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.", "label": "Operating Lease, Cost", "terseLabel": "Operating lease cost" } } }, "localname": "OperatingLeaseCost", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Lessee, Operating Lease, Liability, Payment, Due [Abstract]", "terseLabel": "Operating Leases" } } }, "localname": "OperatingLeaseLiabilitiesPaymentsDueAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingLeaseLiability": { "auth_ref": [ "r295" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetailsCalc2": { "order": 2.0, "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.", "label": "Operating Lease, Liability", "totalLabel": "Present value of minimum lease payments" } } }, "localname": "OperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiabilityCurrent": { "auth_ref": [ "r295" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 1.0, "parentTag": "us-gaap_OperatingLeaseLiability", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.", "label": "Operating Lease, Liability, Current", "negatedLabel": "Less: current maturities of lease obligations", "terseLabel": "Current maturities of operating leases" } } }, "localname": "OperatingLeaseLiabilityCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseLiabilityNoncurrent": { "auth_ref": [ "r295" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails": { "order": 2.0, "parentTag": "us-gaap_OperatingLeaseLiability", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.", "label": "Operating Lease, Liability, Noncurrent", "terseLabel": "Long-term obligations under operating leases", "verboseLabel": "Long-term lease obligations" } } }, "localname": "OperatingLeaseLiabilityNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/LeasesSummaryOfScheduledFutureMinimumLeasePaymentsUnderOperatingAndFinanceLeasesDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasePayments": { "auth_ref": [ "r299", "r304" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.", "label": "Operating Lease, Payments", "terseLabel": "Operating cash flows for operating leases" } } }, "localname": "OperatingLeasePayments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesSupplementalCashFlowInformationRelatedToLeasesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseRightOfUseAsset": { "auth_ref": [ "r294" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of lessee's right to use underlying asset under operating lease.", "label": "Operating Lease, Right-of-Use Asset", "terseLabel": "Operating lease right-of-use assets" } } }, "localname": "OperatingLeaseRightOfUseAsset", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": { "auth_ref": [ "r307", "r310" ], "lang": { "en-US": { "role": { "documentation": "Weighted average discount rate for operating lease calculated at point in time.", "label": "Operating Lease, Weighted Average Discount Rate, Percent", "terseLabel": "Weighted-average discount rate - operating leases" } } }, "localname": "OperatingLeaseWeightedAverageDiscountRatePercent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "percentItemType" }, "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": { "auth_ref": [ "r306", "r310" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Operating Lease, Weighted Average Remaining Lease Term", "terseLabel": "Weighted-average remaining lease term - operating leases" } } }, "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesAdditionalInformationRelatedToLeasesDetails" ], "xbrltype": "durationItemType" }, "us-gaap_OtherAssetImpairmentCharges": { "auth_ref": [ "r93", "r171" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.", "label": "Other Asset Impairment Charges", "terseLabel": "Other miscellaneous impairments" } } }, "localname": "OtherAssetImpairmentCharges", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssetsNoncurrent": { "auth_ref": [ "r31" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of noncurrent assets classified as other.", "label": "Other Assets, Noncurrent", "totalLabel": "Total other assets" } } }, "localname": "OtherAssetsNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssetsNoncurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Assets, Noncurrent [Abstract]", "terseLabel": "Other assets:" } } }, "localname": "OtherAssetsNoncurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax": { "auth_ref": [ "r57" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount before tax and reclassification adjustments of other comprehensive income (loss).", "label": "Other Comprehensive Income (Loss), before Reclassifications, before Tax", "terseLabel": "Changes in value" } } }, "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax": { "auth_ref": [ "r57", "r66" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax, before reclassification adjustments of other comprehensive income (loss).", "label": "Other Comprehensive Income (Loss), before Reclassifications, Net of Tax", "totalLabel": "Changes in value" } } }, "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax": { "auth_ref": [ "r55", "r263" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 2.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).", "label": "Other Comprehensive Income (Loss) before Reclassifications, Tax", "negatedLabel": "Changes in value" } } }, "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r61", "r64", "r66", "r192" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited": { "order": 2.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).", "label": "Other Comprehensive Income (Loss), Net of Tax", "terseLabel": "Other comprehensive income (loss)", "totalLabel": "Total other comprehensive income (loss), net of tax" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive Income (Loss), Net of Tax [Abstract]", "terseLabel": "Other comprehensive income (loss), net of tax:" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax": { "auth_ref": [ "r52", "r54" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited": { "order": 1.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.", "label": "Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax", "negatedLabel": "Employee benefit plans" } } }, "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherCostAndExpenseOperating": { "auth_ref": [ "r74" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 10.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.", "label": "Other Cost and Expense, Operating", "terseLabel": "Other operating expenses" } } }, "localname": "OtherCostAndExpenseOperating", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherIncomeAndExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Income and Expenses [Abstract]" } } }, "localname": "OtherIncomeAndExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherLiabilitiesCurrent": { "auth_ref": [ "r5", "r6", "r35" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 6.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.", "label": "Other Liabilities, Current", "terseLabel": "Other", "verboseLabel": "Other current liabilities" } } }, "localname": "OtherLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherLiabilitiesNoncurrent": { "auth_ref": [ "r39" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.", "label": "Other Liabilities, Noncurrent", "terseLabel": "Other", "verboseLabel": "Other long-term liabilities" } } }, "localname": "OtherLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNonoperatingIncomeExpense": { "auth_ref": [ "r78" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 4.0, "parentTag": "us-gaap_NonoperatingIncomeExpense", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (expense) related to nonoperating activities, classified as other.", "label": "Other Nonoperating Income (Expense)", "terseLabel": "Miscellaneous, net" } } }, "localname": "OtherNonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember": { "auth_ref": [ "r211", "r229", "r230", "r242" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.", "label": "Other Postretirement Benefits Plan [Member]", "verboseLabel": "Other Postretirement Benefits" } } }, "localname": "OtherPostretirementBenefitPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent": { "auth_ref": [ "r15", "r213", "r214", "r218" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "ual_OtherLiabilitiesAndDeferredCreditsNoncurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan, classified as noncurrent. Excludes pension plan.", "label": "Liability, Other Postretirement Defined Benefit Plan, Noncurrent", "terseLabel": "Postretirement benefit liability" } } }, "localname": "OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PacificDestinationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Pacific destinations determined principally based on geographic region as defined by the U.S. Department of Transportation.", "label": "Pacific Destination [Member]", "terseLabel": "Pacific" } } }, "localname": "PacificDestinationMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PassengerMember": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "Person traveling between destinations and not involved in operation of conveyance, including, but not limited to, train, bus, boat and automobile.", "label": "Passenger [Member]", "verboseLabel": "Passenger revenue" } } }, "localname": "PassengerMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_PaymentsForProceedsFromOtherInvestingActivities": { "auth_ref": [ "r80", "r84", "r106" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 6.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash (inflow) outflow from investing activities classified as other.", "label": "Payments for (Proceeds from) Other Investing Activities", "negatedLabel": "Other, net" } } }, "localname": "PaymentsForProceedsFromOtherInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForRepurchaseOfCommonStock": { "auth_ref": [ "r87" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 7.0, "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": "Repurchases of common stock" } } }, "localname": "PaymentsForRepurchaseOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDebtIssuanceCosts": { "auth_ref": [ "r89" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 6.0, "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", "negatedTerseLabel": "Capitalized financing costs" } } }, "localname": "PaymentsOfDebtIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates": { "auth_ref": [ "r82" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 4.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).", "label": "Payments to Acquire Interest in Subsidiaries and Affiliates", "negatedLabel": "Investment in affiliates" } } }, "localname": "PaymentsToAcquireInterestInSubsidiariesAndAffiliates", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireInvestments": { "auth_ref": [ "r84" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 2.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the purchase of all investments (debt, security, other) during the period.", "label": "Payments to Acquire Investments", "negatedLabel": "Purchases of short-term and other investments" } } }, "localname": "PaymentsToAcquireInvestments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireLoansReceivable": { "auth_ref": [ "r81" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 5.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for the purchase of loan receivable arising from the financing of goods and services.", "label": "Payments to Acquire Loans Receivable", "negatedTerseLabel": "Loans made to others" } } }, "localname": "PaymentsToAcquireLoansReceivable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireProductiveAssets": { "auth_ref": [ "r83" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 1.0, "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", "negatedLabel": "Capital expenditures" } } }, "localname": "PaymentsToAcquireProductiveAssets", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PensionPlansDefinedBenefitMember": { "auth_ref": [ "r210", "r229", "r230", "r242" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits.", "label": "Pension Plan [Member]", "terseLabel": "Pension Benefits", "verboseLabel": "Pension Benefits" } } }, "localname": "PensionPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails", "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PortionAtFairValueFairValueDisclosureMember": { "auth_ref": [ "r281" ], "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" } } }, "localname": "PortionAtFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsCarryingValuesAndEstimatedFairValuesOfFinancialInstrumentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PostemploymentBenefitsPeriodExpense": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 2.0, "parentTag": "us-gaap_RestructuringSettlementAndImpairmentProvisions", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Period expense related to postemployment benefits.", "label": "Postemployment Benefits, Period Expense", "terseLabel": "Severance and benefit costs" } } }, "localname": "PostemploymentBenefitsPeriodExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails", "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PreferredStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company.", "label": "Preferred Stock [Member]", "terseLabel": "Preferred Stock" } } }, "localname": "PreferredStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PreferredStockValue": { "auth_ref": [ "r16" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Preferred Stock, Value, Issued", "terseLabel": "Preferred stock" } } }, "localname": "PreferredStockValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": { "auth_ref": [ "r2", "r26", "r27" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.", "label": "Prepaid Expense and Other Assets, Current", "terseLabel": "Prepaid expenses and other" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfLongTermDebt": { "auth_ref": [ "r85" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 1.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.", "label": "Proceeds from Issuance of Long-term Debt", "terseLabel": "Proceeds from issuance of long-term debt", "verboseLabel": "Proceeds received from issuance of debt" } } }, "localname": "ProceedsFromIssuanceOfLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/DebtDetailsOfPassThroughTrustsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities": { "auth_ref": [ "r86", "r90", "r106" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 5.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from financing activities classified as other.", "label": "Proceeds from (Payments for) Other Financing Activities", "terseLabel": "Other, net" } } }, "localname": "ProceedsFromPaymentsForOtherFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments": { "auth_ref": [ "r80" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.", "label": "Proceeds from Sale, Maturity and Collection of Investments", "terseLabel": "Proceeds from sale of short-term and other investments" } } }, "localname": "ProceedsFromSaleMaturityAndCollectionsOfInvestments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProductAndServiceOtherMember": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "Article or substance produced by nature, labor or machinery and act of providing assistance, classified as other.", "label": "Product and Service, Other [Member]", "verboseLabel": "Other operating revenue" } } }, "localname": "ProductAndServiceOtherMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "domainItemType" }, "us-gaap_PropertyPlantAndEquipmentByTypeAxis": { "auth_ref": [ "r30", "r170" ], "lang": { "en-US": { "role": { "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.", "label": "Property, Plant and Equipment, Type [Axis]", "terseLabel": "Property, Plant and Equipment, Type [Axis]" } } }, "localname": "PropertyPlantAndEquipmentByTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentGross": { "auth_ref": [ "r29", "r168" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 1.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property, Plant and Equipment, Gross", "totalLabel": "Total operating property and equipment, at cost" } } }, "localname": "PropertyPlantAndEquipmentGross", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r8", "r9", "r170", "r344" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property, Plant and Equipment, Net", "totalLabel": "Total operating property and equipment, net" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentNetAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Property, Plant and Equipment, Net [Abstract]", "terseLabel": "Operating property and equipment:" } } }, "localname": "PropertyPlantAndEquipmentNetAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentOther": { "auth_ref": [ "r170" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentGross", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.", "label": "Property, Plant and Equipment, Other, Gross", "terseLabel": "Other property and equipment", "verboseLabel": "Other property and equipment, owned and finance leases" } } }, "localname": "PropertyPlantAndEquipmentOther", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentTypeDomain": { "auth_ref": [ "r8", "r168" ], "lang": { "en-US": { "role": { "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.", "label": "Property, Plant and Equipment, Type [Domain]", "terseLabel": "Property, Plant and Equipment, Type [Domain]" } } }, "localname": "PropertyPlantAndEquipmentTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock": { "auth_ref": [ "r41", "r105" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 7.0, "parentTag": "us-gaap_StockholdersEquity", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount due from owner or affiliate of reporting entity for issuance of shares. Includes, but is not limited to, amount due for award under share-based payment arrangement. Excludes amount due from officer or director.", "label": "Receivable from Shareholders or Affiliates for Issuance of Capital Stock", "negatedLabel": "Receivable from related parties" } } }, "localname": "ReceivableFromShareholdersOrAffiliatesForIssuanceOfCapitalStock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "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_ReceivablesFromStockholderMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Category of equity that is due from owners or affiliates of the reporting entity (including due from officers or directors) resulting from the sale of stock before the cash payment is received.", "label": "Receivables from Stockholder [Member]", "terseLabel": "Receivable from Related Parties, Net" } } }, "localname": "ReceivablesFromStockholderMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_ReceivablesNetCurrent": { "auth_ref": [ "r18", "r25", "r343", "r352" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.", "label": "Receivables, Net, Current", "terseLabel": "Receivables, less allowance for doubtful accounts (2019 \u2014 $9; 2018 \u2014 $8)", "verboseLabel": "Receivables, less allowance for doubtful accounts" } } }, "localname": "ReceivablesNetCurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax": { "auth_ref": [ "r57", "r59" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 1.0, "parentTag": "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before tax of reclassification adjustments of other comprehensive income (loss).", "label": "Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax", "terseLabel": "Amounts reclassified to earnings" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax": { "auth_ref": [ "r57", "r59", "r66" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss).", "label": "Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax", "totalLabel": "Amounts reclassified to earnings" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationFromAociCurrentPeriodTax": { "auth_ref": [ "r55", "r58", "r263" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": 2.0, "parentTag": "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).", "label": "Reclassification from AOCI, Current Period, Tax", "negatedTerseLabel": "Amounts reclassified to earnings" } } }, "localname": "ReclassificationFromAociCurrentPeriodTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RegionalCarrierMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Carrier either owned by, affiliated with, or under contractual arrangement with a primary \"mainline\" carrier, or its brand, that provides commuter or feeder services to such \"mainline\" carrier.", "label": "Regional Carrier [Member]", "terseLabel": "Regional Aircraft" } } }, "localname": "RegionalCarrierMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RepaymentsOfLongTermDebt": { "auth_ref": [ "r88" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited": { "order": 3.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.", "label": "Repayments of Long-term Debt", "negatedLabel": "Payments of long-term debt" } } }, "localname": "RepaymentsOfLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r1", "r7", "r95", "r99" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical": { "order": 3.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. 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": "Restricted Cash and Cash Equivalents, Current", "terseLabel": "Restricted cash (included in Prepaid expenses and other)" } } }, "localname": "RestrictedCashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedCashAndCashEquivalentsNoncurrent": { "auth_ref": [ "r4", "r10", "r95", "r99", "r357" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical": { "order": 2.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 3.0, "parentTag": "us-gaap_OtherAssetsNoncurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. 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": "Restricted Cash and Cash Equivalents, Noncurrent", "terseLabel": "Restricted cash" } } }, "localname": "RestrictedCashAndCashEquivalentsNoncurrent", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedStockUnitsRSUMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.", "label": "Restricted Stock Units (RSUs) [Member]", "terseLabel": "RSUs" } } }, "localname": "RestrictedStockUnitsRSUMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock": { "auth_ref": [ "r179" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.", "label": "Restructuring and Related Activities Disclosure [Text Block]", "terseLabel": "SPECIAL CHARGES AND MARK-TO-MARKET (MTM) ADJUSTMENTS" } } }, "localname": "RestructuringAndRelatedActivitiesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustments" ], "xbrltype": "textBlockItemType" }, "us-gaap_RestructuringAndRelatedCostExpectedCost1": { "auth_ref": [ "r172", "r173", "r177", "r178" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount expected to be recognized in earnings for the specified restructuring cost.", "label": "Restructuring and Related Cost, Expected Cost", "terseLabel": "Severance payment per participant (up to)" } } }, "localname": "RestructuringAndRelatedCostExpectedCost1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringCostAndReserveAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of restructuring cost.", "label": "Restructuring Type [Axis]", "terseLabel": "Restructuring Type [Axis]" } } }, "localname": "RestructuringCostAndReserveAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RestructuringCostAndReserveLineItems": { "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": "Restructuring Cost and Reserve [Line Items]", "terseLabel": "Restructuring Cost and Reserve [Line Items]" } } }, "localname": "RestructuringCostAndReserveLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RestructuringSettlementAndImpairmentProvisions": { "auth_ref": [ "r74" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails": { "order": 1.0, "parentTag": "ual_SpecialChargesAndLossesOnFinancialInstrumentsNonOperatingBeforeTax", "weight": 1.0 }, "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 9.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of restructuring charges, remediation cost, and asset impairment loss.", "label": "Restructuring, Settlement and Impairment Provisions", "terseLabel": "Special charges", "totalLabel": "Total operating special charges" } } }, "localname": "RestructuringSettlementAndImpairmentProvisions", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsComponentsOfSpecialChargesDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r20", "r197", "r341" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 4.0, "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)", "terseLabel": "Retained earnings" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails" ], "xbrltype": "monetaryItemType" }, "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]", "terseLabel": "Retained Earnings" } } }, "localname": "RetainedEarningsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_RetirementPlanTypeAxis": { "auth_ref": [ "r210", "r211", "r229", "r230", "r242" ], "lang": { "en-US": { "role": { "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Axis]", "terseLabel": "Retirement Plan Type [Axis]" } } }, "localname": "RetirementPlanTypeAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails", "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetirementPlanTypeDomain": { "auth_ref": [ "r210", "r211", "r229", "r230", "r242" ], "lang": { "en-US": { "role": { "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Domain]", "terseLabel": "Retirement Plan Type [Domain]" } } }, "localname": "RetirementPlanTypeDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails", "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RevenueFromContractWithCustomerAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Revenue from Contract with Customer [Abstract]" } } }, "localname": "RevenueFromContractWithCustomerAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "xbrltype": "stringItemType" }, "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax": { "auth_ref": [ "r203", "r204" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 2.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.", "label": "Revenue from Contract with Customer, Excluding Assessed Tax", "verboseLabel": "Operating revenue" } } }, "localname": "RevenueFromContractWithCustomerExcludingAssessedTax", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RevenueNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/RevenueOperatingRevenueByGeographicRegionDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RevenueFromContractWithCustomerTextBlock": { "auth_ref": [ "r208" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.", "label": "Revenue from Contract with Customer [Text Block]", "terseLabel": "REVENUE" } } }, "localname": "RevenueFromContractWithCustomerTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/Revenue" ], "xbrltype": "textBlockItemType" }, "us-gaap_RevenuesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Revenues [Abstract]", "terseLabel": "Operating revenue:" } } }, "localname": "RevenuesAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_RevolvingCreditFacilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.", "label": "Revolving Credit Facility [Member]", "terseLabel": "Revolving Credit Facility" } } }, "localname": "RevolvingCreditFacilityMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability": { "auth_ref": [ "r305", "r310" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in right-of-use asset obtained in exchange for finance lease liability.", "label": "Right-of-Use Asset Obtained in Exchange for Finance Lease Liability", "terseLabel": "Property and equipment acquired through finance leases" } } }, "localname": "RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": { "auth_ref": [ "r305", "r310" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.", "label": "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability", "terseLabel": "Right-of-use assets acquired through operating leases" } } }, "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable": { "auth_ref": [ "r43" ], "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.unitedcontinentalholdings.com/role/BrwTermLoanDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": { "auth_ref": [ "r57" ], "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 of Accumulated Other Comprehensive Income, Net of Tax" } } }, "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of supplemental cash flow information for the periods presented.", "label": "Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]", "terseLabel": "Supplemental Cash Flow Information Related to Leases" } } }, "localname": "ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock": { "auth_ref": [ "r251" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.", "label": "Share-based Payment Arrangement, Cost by Plan [Table Text Block]", "terseLabel": "Information Related to Share-Based Compensation" } } }, "localname": "ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable": { "auth_ref": [ "r229", "r230", "r231", "r232", "r241" ], "lang": { "en-US": { "role": { "documentation": "Disclosures about an individual defined benefit pension plan or an other postretirement defined benefit plan. It may be appropriate to group certain similar plans. Also includes schedule for fair value of plan assets by major categories of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).", "label": "Schedule of Defined Benefit Plans Disclosures [Table]", "terseLabel": "Schedule of Defined Benefit Plans Disclosures [Table]" } } }, "localname": "ScheduleOfDefinedBenefitPlansDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansComponentsOfNetPeriodicBenefitCostDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r123" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.", "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]", "terseLabel": "Computation of Basic and Diluted Earnings Per Share" } } }, "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": { "auth_ref": [ "r269", "r270" ], "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.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": { "auth_ref": [ "r187" ], "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]", "terseLabel": "Contractual Principal Payments under Long-Term Debt Agreements" } } }, "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": { "auth_ref": [ "r221" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.", "label": "Schedule of Net Benefit Costs [Table Text Block]", "terseLabel": "Components of Net Periodic Benefit Cost" } } }, "localname": "ScheduleOfNetBenefitCostsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": { "auth_ref": [ "r108", "r110", "r126", "r127", "r128" ], "lang": { "en-US": { "role": { "documentation": "Tabular 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": "Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]", "terseLabel": "Impact of the Adoption of the New Lease Standard" } } }, "localname": "ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTable": { "auth_ref": [ "r174", "r175", "r176" ], "lang": { "en-US": { "role": { "documentation": "Table presenting the description of the restructuring costs, such as the expected cost; the costs incurred during the period; the cumulative costs incurred as of the balance sheet date; the income statement caption within which the restructuring charges recognized for the period are included; and the amount of and periodic changes to an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost by type of restructuring.", "label": "Schedule of Restructuring and Related Costs [Table]", "terseLabel": "Schedule of Restructuring and Related Costs [Table]" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock": { "auth_ref": [ "r174", "r175", "r176" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets.", "label": "Restructuring and Related Costs [Table Text Block]", "terseLabel": "Components of Special Charges" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTextBlock", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": { "auth_ref": [ "r247", "r254" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about share-based payment arrangement.", "label": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]", "terseLabel": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]" } } }, "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SecuredDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity's assets.", "label": "Secured Debt [Member]", "terseLabel": "Secured Debt" } } }, "localname": "SecuredDebtMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SellingExpense": { "auth_ref": [ "r75" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited": { "order": 7.0, "parentTag": "us-gaap_CostsAndExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Expenses recognized in the period that are directly related to the selling and distribution of products or services.", "label": "Selling Expense", "terseLabel": "Distribution expenses" } } }, "localname": "SellingExpense", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_SeniorNotesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for (must receive) repayment prior to (relative to) junior and unsecured (general) creditors.", "label": "Senior Notes [Member]", "terseLabel": "Senior Notes" } } }, "localname": "SeniorNotesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/DebtNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": { "auth_ref": [ "r248" ], "lang": { "en-US": { "role": { "documentation": "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period", "terseLabel": "Vesting period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "durationItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": { "auth_ref": [ "r250" ], "lang": { "en-US": { "role": { "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period", "terseLabel": "Awards granted (in shares)" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": { "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": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]", "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": { "auth_ref": [ "r245", "r249" ], "lang": { "en-US": { "role": { "documentation": "Award under share-based payment arrangement.", "label": "Award Type [Domain]", "terseLabel": "Award Type [Domain]" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EmployeeBenefitPlansNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShareRepurchaseProgramAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by share repurchase program.", "label": "Share Repurchase Program [Axis]", "terseLabel": "Share Repurchase Program [Axis]" } } }, "localname": "ShareRepurchaseProgramAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareRepurchaseProgramDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of the share repurchase program.", "label": "Share Repurchase Program [Domain]", "terseLabel": "Share Repurchase Program [Domain]" } } }, "localname": "ShareRepurchaseProgramDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ShortTermInvestments": { "auth_ref": [ "r12", "r325", "r326", "r328", "r338" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 2.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.", "label": "Short-term Investments", "terseLabel": "Short-term investments" } } }, "localname": "ShortTermInvestments", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r42", "r192" ], "lang": { "en-US": { "role": { "documentation": "Information by component of equity.", "label": "Equity Components [Axis]", "terseLabel": "Equity Components [Axis]" } } }, "localname": "StatementEquityComponentsAxis", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "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.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "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.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnaudited", "http://www.unitedcontinentalholdings.com/role/CondensedStatementsOfConsolidatedCashFlowsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedComprehensiveIncomeUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedOperationsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation": { "auth_ref": [ "r16", "r17", "r192", "r197" ], "lang": { "en-US": { "role": { "documentation": "Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).", "label": "Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture", "terseLabel": "Net treasury stock issued for share-based awards (in shares)" } } }, "localname": "StockIssuedDuringPeriodSharesShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued": { "auth_ref": [ "r16", "r17", "r192", "r197", "r198" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.", "label": "Stock Issued During Period, Value, Treasury Stock Reissued", "terseLabel": "Net treasury stock issued for share-based awards" } } }, "localname": "StockIssuedDuringPeriodValueTreasuryStockReissued", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockRepurchaseProgramAuthorizedAmount1": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of stock repurchase plan authorized.", "label": "Stock Repurchase Program, Authorized Amount", "terseLabel": "Authorized amount under share repurchase program" } } }, "localname": "StockRepurchaseProgramAuthorizedAmount1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount remaining of a stock repurchase plan authorized.", "label": "Stock Repurchase Program, Remaining Authorized Repurchase Amount", "terseLabel": "Amount remaining under repurchase programs" } } }, "localname": "StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquity": { "auth_ref": [ "r17", "r21", "r22", "r137" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 7.0, "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": "Balance", "periodStartLabel": "Balance", "totalLabel": "Total stockholders' equity" } } }, "localname": "StockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsOfAccumulatedOtherComprehensiveIncomeNetOfTaxDetails", "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Stockholders' Equity Attributable to Parent [Abstract]", "terseLabel": "Stockholders' equity:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "stringItemType" }, "us-gaap_StockholdersEquityOther": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.", "label": "Stockholders' Equity, Other", "negatedLabel": "Other" } } }, "localname": "StockholdersEquityOther", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_SubleaseIncome": { "auth_ref": [ "r303", "r310" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails": { "order": 5.0, "parentTag": "us-gaap_LeaseCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of sublease income excluding finance and operating lease expense.", "label": "Sublease Income", "negatedTerseLabel": "Sublease income" } } }, "localname": "SubleaseIncome", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/LeasesComponentsOfLeaseCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_SubsequentEventMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.", "label": "Subsequent Event [Member]", "terseLabel": "Subsequent Event [Member]" } } }, "localname": "SubsequentEventMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SubsequentEventTypeAxis": { "auth_ref": [ "r312" ], "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.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_SubsequentEventTypeDomain": { "auth_ref": [ "r312" ], "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.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TangibleAssetImpairmentCharges": { "auth_ref": [ "r0", "r171" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.", "label": "Tangible Asset Impairment Charges", "terseLabel": "Impairment of assets removed from operations" } } }, "localname": "TangibleAssetImpairmentCharges", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": { "auth_ref": [ "r318" ], "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]" } } }, "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockMember": { "auth_ref": [ "r41", "r198" ], "lang": { "en-US": { "role": { "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.", "label": "Treasury Stock [Member]", "terseLabel": "Treasury Stock" } } }, "localname": "TreasuryStockMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockSharesAcquired": { "auth_ref": [ "r17", "r192", "r197" ], "lang": { "en-US": { "role": { "documentation": "Number of shares that have been repurchased during the period and are being held in treasury.", "label": "Treasury Stock, Shares, Acquired", "negatedLabel": "Repurchases of common stock (in shares)", "terseLabel": "Number of shares repurchased (in shares)" } } }, "localname": "TreasuryStockSharesAcquired", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockValue": { "auth_ref": [ "r41", "r198", "r199" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited": { "order": 5.0, "parentTag": "us-gaap_StockholdersEquity", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.", "label": "Treasury Stock, Value", "negatedLabel": "Stock held in treasury, at cost" } } }, "localname": "TreasuryStockValue", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/ConsolidatedBalanceSheetsUnaudited" ], "xbrltype": "monetaryItemType" }, "us-gaap_TreasuryStockValueAcquiredCostMethod": { "auth_ref": [ "r192", "r197", "r198" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.", "label": "Treasury Stock, Value, Acquired, Cost Method", "negatedTerseLabel": "Repurchases of common stock", "terseLabel": "Repurchases of common stock" } } }, "localname": "TreasuryStockValueAcquiredCostMethod", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareNarrativeDetails", "http://www.unitedcontinentalholdings.com/role/StatementsOfConsolidatedStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_TypeOfAdoptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.", "label": "Type of Adoption [Domain]", "terseLabel": "Type of Adoption [Domain]" } } }, "localname": "TypeOfAdoptionMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnBalanceSheetDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfCashFlowsDetails", "http://www.unitedcontinentalholdings.com/role/RecentlyIssuedAccountingStandardsImpactOfAdoptionOfNewLeaseStandardOnStatementOfConsolidatedOperationsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TypeOfRestructuringDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Identification of the types of restructuring costs.", "label": "Type of Restructuring [Domain]", "terseLabel": "Type of Restructuring [Domain]" } } }, "localname": "TypeOfRestructuringDomain", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_USGovernmentAgenciesDebtSecuritiesMember": { "auth_ref": [ "r219", "r327" ], "lang": { "en-US": { "role": { "documentation": "Debentures, notes, and other debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae). Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is 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).", "label": "US Government Agencies Debt Securities [Member]", "verboseLabel": "U.S. government and agency notes" } } }, "localname": "USGovernmentAgenciesDebtSecuritiesMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/FinancialInstrumentsAndFairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" ], "xbrltype": "domainItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 5.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due within Five Years", "terseLabel": "2023" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 4.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due within Four Years", "terseLabel": "2022" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 2.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due within Two Years", "terseLabel": "2020" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 3.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due within Three Years", "terseLabel": "2021" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).", "label": "Unrecorded Unconditional Purchase Obligation", "totalLabel": "Total commitments" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears": { "auth_ref": [ "r180" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 6.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due after Five Years", "terseLabel": "After 2023" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear": { "auth_ref": [], "calculation": { "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails": { "order": 1.0, "parentTag": "us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year", "terseLabel": "Last six months of 2019" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesSummaryOfCommitmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.", "label": "Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required", "terseLabel": "Number of aircraft committed to purchase", "verboseLabel": "Number of firm commitments" } } }, "localname": "UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesFirmCommitmentsAndOptionsToPurchaseAircraftDetails", "http://www.unitedcontinentalholdings.com/role/CommitmentsAndContingenciesNarrativeDetails" ], "xbrltype": "decimalItemType" }, "us-gaap_UseRightsMember": { "auth_ref": [ "r266" ], "lang": { "en-US": { "role": { "documentation": "Legal right to use or benefit from the use of natural resources or access. Examples include, but are not limited to, drilling rights, water rights, air rights, timber cutting rights and route authorities.", "label": "Use Rights [Member]", "terseLabel": "Use Rights" } } }, "localname": "UseRightsMember", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/SpecialChargesAndMarkToMarketMtmAdjustmentsNarrativeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": { "auth_ref": [ "r117", "r122" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "lang": { "en-US": { "role": { "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.", "label": "Weighted Average Number of Shares Outstanding, Diluted", "totalLabel": "Diluted weighted-average shares outstanding (in shares)" } } }, "localname": "WeightedAverageNumberOfDilutedSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": { "auth_ref": [ "r115", "r122" ], "calculation": { "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails": { "order": 1.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.", "label": "Weighted Average Number of Shares Outstanding, Basic", "terseLabel": "Basic weighted-average shares outstanding (in shares)" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingBasic", "nsuri": "http://fasb.org/us-gaap/2019-01-31", "presentation": [ "http://www.unitedcontinentalholdings.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetails" ], "xbrltype": "sharesItemType" } }, "unitCount": 11 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760" }, "r1": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765" }, "r10": { "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" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790" }, "r101": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(h))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r102": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(m)(1)(iii))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r103": { "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" }, "r104": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(2))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r105": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(k)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r106": { "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" }, "r107": { "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" }, "r108": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794" }, "r11": { "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" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794" }, "r114": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "250", "URI": "http://asc.fasb.org/topic&trid=2122394" }, "r115": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256" }, "r116": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1377-109256" }, "r117": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256" }, "r118": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256" }, "r119": { "Name": "Accounting Standards Codification", "Paragraph": "28A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256" }, "r12": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(2))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r120": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256" }, "r121": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256" }, "r122": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r123": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r124": { "Name": "Accounting Standards Codification", "Paragraph": "52", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258" }, "r125": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "260", "URI": "http://asc.fasb.org/topic&trid=2144383" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305" }, "r127": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305" }, "r128": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.10-01.(b)(6))", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699" }, "r129": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r13": { "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" }, "r130": { "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" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r132": { "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" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "40", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4647-111522" }, "r135": { "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" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524" }, "r137": { "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" }, "r138": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/subtopic&trid=2196772" }, "r139": { "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" }, "r14": { "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" }, "r140": { "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" }, "r141": { "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" }, "r142": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "321", "URI": "http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714" }, "r143": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "326", "URI": "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446" }, "r145": { "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" }, "r146": { "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" }, "r147": { "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" }, "r148": { "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" }, "r149": { "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" }, "r15": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(24))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r150": { "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" }, "r151": { "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" }, "r152": { "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" }, "r153": { "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" }, "r154": { "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" }, "r155": { "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" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266" }, "r157": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975" }, "r158": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r16": { "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" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "((a)(1),(b))", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r162": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r163": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275" }, "r166": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228" }, "r167": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r169": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r17": { "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" }, "r170": { "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" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230" }, "r172": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r173": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r174": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r175": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.3)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747" }, "r176": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.4)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r177": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(b)(1))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r178": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(d))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r179": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "420", "URI": "http://asc.fasb.org/topic&trid=2175745" }, "r18": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r180": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "440", "URI": "http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308" }, "r181": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r182": { "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" }, "r183": { "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" }, "r184": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r185": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248" }, "r186": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248" }, "r187": { "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" }, "r188": { "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" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(1)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870" }, "r19": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r190": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870" }, "r191": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r192": { "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" }, "r193": { "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" }, "r194": { "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" }, "r195": { "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" }, "r196": { "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" }, "r197": { "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" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656" }, "r2": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765" }, "r20": { "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" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044" }, "r202": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046" }, "r208": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "606", "URI": "http://asc.fasb.org/topic&trid=49130388" }, "r209": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "710", "URI": "http://asc.fasb.org/topic&trid=2127225" }, "r21": { "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" }, "r210": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r211": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r212": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "712", "URI": "http://asc.fasb.org/topic&trid=2197446" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919" }, "r214": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r218": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r219": { "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" }, "r22": { "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" }, "r220": { "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" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r225": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r227": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(7)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r228": { "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" }, "r229": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920" }, "r23": { "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" }, "r230": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920" }, "r231": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r237": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r238": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r239": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(7)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r24": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(4)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r240": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920" }, "r241": { "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" }, "r242": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "70", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942" }, "r243": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "715", "URI": "http://asc.fasb.org/topic&trid=2235017" }, "r244": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899" }, "r245": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r246": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r247": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901" }, "r248": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r249": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a),(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(4))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r250": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r251": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r252": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r253": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r254": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901" }, "r255": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 14.F)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809" }, "r256": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907" }, "r257": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907" }, "r258": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "718", "URI": "http://asc.fasb.org/topic&trid=2228938" }, "r259": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318" }, "r26": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(7))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r260": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319" }, "r261": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319" }, "r262": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319" }, "r263": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324" }, "r264": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324" }, "r265": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "740", "URI": "http://asc.fasb.org/topic&trid=2144680" }, "r266": { "Name": "Accounting Standards Codification", "Paragraph": "31", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(i)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5419-128473" }, "r267": { "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" }, "r268": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959" }, "r269": { "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" }, "r27": { "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" }, "r270": { "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" }, "r271": { "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" }, "r272": { "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" }, "r273": { "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" }, "r274": { "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" }, "r275": { "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" }, "r276": { "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" }, "r277": { "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" }, "r278": { "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" }, "r279": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "60", "SubTopic": "10", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260" }, "r28": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.1)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r280": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740" }, "r281": { "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" }, "r282": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13279-108611" }, "r283": { "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" }, "r284": { "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" }, "r285": { "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" }, "r286": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906" }, "r287": { "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" }, "r288": { "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" }, "r289": { "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" }, "r29": { "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" }, "r290": { "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" }, "r291": { "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" }, "r292": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984" }, "r293": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "40", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888415&loc=SL77918607-209975" }, "r294": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977" }, "r295": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977" }, "r296": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977" }, "r297": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977" }, "r298": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6801-107765" }, "r30": { "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" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r303": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r304": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(1)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r305": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(2)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r306": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(3)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r307": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)(4)", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r308": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980" }, "r309": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980" }, "r31": { "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" }, "r310": { "Name": "Accounting Standards Codification", "Paragraph": "53", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "842", "URI": "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971" }, "r311": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "850", "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864" }, "r312": { "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" }, "r313": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "855", "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662" }, "r314": { "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" }, "r315": { "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" }, "r316": { "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" }, "r317": { "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" }, "r318": { "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" }, "r319": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "340", "Topic": "928", "URI": "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004" }, "r32": { "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" }, "r320": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "25", "SubTopic": "20", "Topic": "940", "URI": "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953" }, "r321": { "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" }, "r322": { "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" }, "r323": { "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" }, "r324": { "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" }, "r325": { "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" }, "r326": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(5))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r327": { "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" }, "r328": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(6))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r329": { "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" }, "r33": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(b),22(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r330": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(15))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r331": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(22))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r332": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260" }, "r333": { "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" }, "r334": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "405", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818" }, "r335": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Subparagraph": "e", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823" }, "r336": { "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" }, "r337": { "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" }, "r338": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(1)(g))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r339": { "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" }, "r34": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19,20)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r340": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(16))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r341": { "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" }, "r342": { "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" }, "r343": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(5))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910" }, "r344": { "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" }, "r345": { "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" }, "r346": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(18))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263" }, "r347": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(19))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263" }, "r348": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(8))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263" }, "r349": { "Name": "Accounting Standards Codification", "Paragraph": "4H", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438" }, "r35": { "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" }, "r350": { "Name": "Accounting Standards Codification", "Paragraph": "13H", "Publisher": "FASB", "Section": "55", "SubTopic": "40", "Subparagraph": "(a)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441" }, "r351": { "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" }, "r352": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.6-06(3))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996" }, "r353": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12(2)(i))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010" }, "r354": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-12C(1)(a))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010" }, "r355": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-13(1))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010" }, "r356": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "S99", "SubTopic": "320", "Subparagraph": "(SX 210.12-15(Column A))", "Topic": "946", "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010" }, "r357": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "210", "Topic": "954", "URI": "http://asc.fasb.org/extlink&oid=116631420&loc=SL116631458-115580" }, "r358": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b" }, "r359": { "Name": "Exchange Act", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "d1-1" }, "r36": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.21)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r360": { "Name": "Form 10-Q", "Number": "240", "Publisher": "SEC", "Section": "13", "Subsection": "a-13" }, "r361": { "Name": "Forms 10-K, 10-Q, 20-F", "Number": "240", "Publisher": "SEC", "Section": "13", "Subsection": "a-1-" }, "r362": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r363": { "Name": "Regulation S-K (SK)", "Number": "229", "Paragraph": "(a)", "Publisher": "SEC", "Section": "303", "Subparagraph": "(5)" }, "r364": { "Name": "Regulation S-T", "Number": "232", "Publisher": "SEC", "Section": "405" }, "r365": { "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "11", "Subsection": "03" }, "r366": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "(m)", "Publisher": "SEC", "Section": "4", "Subparagraph": "(1)(iii)", "Subsection": "08" }, "r37": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r38": { "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" }, "r39": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.24)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r4": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765" }, "r40": { "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" }, "r41": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29,30)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r42": { "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" }, "r43": { "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" }, "r44": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.9)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r45": { "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" }, "r46": { "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" }, "r47": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226024-175313" }, "r48": { "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" }, "r49": { "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" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6904-107765" }, "r50": { "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" }, "r51": { "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" }, "r52": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(i-k)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580" }, "r53": { "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" }, "r54": { "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" }, "r55": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580" }, "r57": { "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" }, "r58": { "Name": "Accounting Standards Codification", "Paragraph": "17A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580" }, "r59": { "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" }, "r6": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r61": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580" }, "r64": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581" }, "r67": { "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" }, "r68": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(10))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(20))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r7": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(21))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r71": { "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" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r73": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.2(a),(d))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r74": { "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" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.4)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r76": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.7(b))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r77": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.7)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r78": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.9)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227" }, "r79": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "220", "URI": "http://asc.fasb.org/topic&trid=2134417" }, "r8": { "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" }, "r80": { "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" }, "r81": { "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" }, "r82": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585" }, "r83": { "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" }, "r84": { "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" }, "r85": { "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" }, "r86": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585" }, "r87": { "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" }, "r88": { "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" }, "r89": { "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" }, "r9": { "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" }, "r90": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585" }, "r91": { "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" }, "r92": { "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" }, "r93": { "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" }, "r94": { "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" }, "r95": { "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" }, "r96": { "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" }, "r97": { "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" }, "r98": { "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" }, "r99": { "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" } }, "version": "2.1" }