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Multi-Employer Plans (Parenthetical) (Detail) (Minimum, Multiemployer Plans, Pension, IAM National Pension Plan)
Dec. 31, 2014
Minimum | Multiemployer Plans, Pension | IAM National Pension Plan
  
Multiemployer Plans [Line Items]  
Green zone funded percentage 80.00%ual_MultiEmployerPlansStatusFundedPercentage
/ us-gaap_MultiemployerPlanNameAxis
= ual_InternationalAssociationOfMachinistsNationalPensionPlanMember
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember