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Summary of Collateral Covenants and Cross Default Provisions (Parenthetical) (Detail) (USD $)
In Billions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Credit Agreement  
Debt Instrument [Line Items]  
Unrestricted liquidity required for credit agreement 3ual_DebtCovenantRequiredLiquidity
/ us-gaap_DebtInstrumentAxis
= ual_CreditAgreementMember
Minimum ratio of appraised value of collateral for Credit Agreement 1.67ual_MinimumRatioOfAppraisedValueOfCollateralForCreditAgreement
/ us-gaap_DebtInstrumentAxis
= ual_CreditAgreementMember
United Air Lines 6% Notes Due 2026  
Debt Instrument [Line Items]  
Debt instrument stated interest rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ual_UnitedAirLinesSixPercentNotesDueTwentyTwentySixMember
Debt instrument maturity year 2026
United Air Lines 6% Notes Due 2028  
Debt Instrument [Line Items]  
Debt instrument stated interest rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ual_UnitedAirLinesSixPercentNotesDueTwentyTwentyEightMember
Debt instrument maturity year 2028
6.375% Senior Notes due 2018  
Debt Instrument [Line Items]  
Debt instrument stated interest rate 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ual_SixPointThreeSevenFivePercentSeniorNotesDueTwentyEighteenMember
Debt instrument maturity year 2018
Senior Notes 6% Due 2020  
Debt Instrument [Line Items]  
Debt instrument stated interest rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ual_SeniorNotesSixPercentDueTwentyTwentyMember
Debt instrument maturity year 2020