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Variable Interest Entities - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary)
Dec. 31, 2014
Aircraft
Mainline
  
Variable Interest Entity [Line Items]  
Aircraft under operating lease, fixed purchase options 60ual_NumberOfAircraftUnderOperatingLeaseAgreementsWithFixedPricePurchaseOptions
/ us-gaap_ProductOrServiceAxis
= us-gaap_MainlineMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Regional Carrier
  
Variable Interest Entity [Line Items]  
Aircraft under operating lease 239ual_NumberOfAircraftUnderOperatingLeaseAgreementsWithPurchaseOptionsAtPricesPotentiallyBelowFairValue
/ us-gaap_ProductOrServiceAxis
= us-gaap_RegionalCarrierMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember