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Multi-Employer Plans (Detail) (Multiemployer Plans, Pension, IAM National Pension Plan, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Multiemployer Plans [Line Items]      
EIN/ Pension Plan Number 51-6031295 - 002    
Pension Protection Act Zone Status (2014 and 2013) Green [1]    
FIP/RP Status Pending/Implemented No    
United's Contributions   $ 368us-gaap_MultiemployerPlansPlanContributions  
Surcharge Imposed No    
United Airlines, Inc.
     
Multiemployer Plans [Line Items]      
United's Contributions $ 39us-gaap_MultiemployerPlansPlanContributions
/ dei_LegalEntityAxis
= ual_UnitedAirLinesIncMember
/ us-gaap_MultiemployerPlanNameAxis
= ual_InternationalAssociationOfMachinistsNationalPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
$ 38us-gaap_MultiemployerPlansPlanContributions
/ dei_LegalEntityAxis
= ual_UnitedAirLinesIncMember
/ us-gaap_MultiemployerPlanNameAxis
= ual_InternationalAssociationOfMachinistsNationalPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
$ 36us-gaap_MultiemployerPlansPlanContributions
/ dei_LegalEntityAxis
= ual_UnitedAirLinesIncMember
/ us-gaap_MultiemployerPlanNameAxis
= ual_InternationalAssociationOfMachinistsNationalPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
[1] Plans in the green zone are at least 80 percent funded.