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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Multiemployer Plans [Line Items]      
EIN/ Pension Plan Number 51-6031295 - 002    
Pension Protection Act Zone Status (2012 and 2011) Green [1]    
FIP/RP Status Pending/Implemented No    
United's Contributions $ 350    
Surcharge Imposed No    
United Air Lines Inc
     
Multiemployer Plans [Line Items]      
United's Contributions $ 36 $ 34 $ 34
[1] Plans in the green zone are at least 80 percent funded.