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Earnings Per Share (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
UAL 6% Senior Convertible Notes [Member]
   
Interest rate of senior notes   6.00%
Expiration date   2031
Principal amount of senior notes $ 633 $ 633
Redeemed rate of senior note   100.00%
UAL 4.5% Senior Limited Subordination Convertible Notes [Member]
   
Interest rate of senior notes   4.50%
Expiration date   2021
Principal amount of senior notes 726 726
Repurchase of senior notes $ 570