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Debt And Advanced Purchase Of Miles (Details) (USD $)
9 Months Ended9 Months Ended3 Months Ended9 Months Ended9 Months Ended
Sep. 30, 2011
Jul. 31, 2011
Dec. 31, 2010
Sep. 30, 2011
Continental Airlines Inc [Member]
Sep. 30, 2011
United Airlines Inc [Member]
Dec. 31, 2010
United Airlines Inc [Member]
Mar. 31, 2011
UAL 5% Senior Convertible Notes [Member]
Jun. 30, 2011
UAL 4.5% Senior Limited Subordination Convertible Notes [Member]
Sep. 30, 2011
Contingent Senior Unsecured Notes PBGC [Member]
Sep. 30, 2011
Contingent Senior Unsecured Notes PBGC [Member]
Jun. 30, 2011
Contingent Senior Unsecured Notes PBGC [Member]
Sep. 30, 2011
Continental 6.750% Senior Secured Notes [Member]
Short-term Debt [Line Items]            
Repurchase of senior notes      $ 150,000,000$ 570,000,000    
Interest rate on notes8.00%         8.00%6.75%
Due date of debt instruments      20212021    
Expiration date of debt instruments         February 14, 2012 2015
Interest rate of senior notes      5.00%4.50%    
Balance of note payable after decrease in long-term debt   210,000,000        
Increase in advanced purchase of miles270,000,000  270,000,000        
Increase in other assets60,000,000  60,000,000        
Principal amount of note       726,000,000    
Outstanding principal amount classified as long-term debt       156,000,000    
UAL's obligation to issue notes to the PBGC, principal        62,500,00062,500,00062,500,000 
Net present value of the non-cash obligation, recorded as a liability49,000,000   49,000,000   49,000,000   
Advanced purchase of miles$ 1,711,000,000$ 165,000,000$ 1,159,000,000 $ 1,442,000,000$ 1,159,000,000