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Customer Financing (Credit Risk Profile By Internally Assigned Ratings) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended3 Months Ended9 Months Ended9 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
Air Tran [Member]
Sep. 30, 2011
Air Tran [Member]
Sep. 30, 2011
BBB Credit Rating [Member]
Sep. 30, 2011
BB Credit Rating [Member]
Sep. 30, 2011
B Credit Rating [Member]
Dec. 31, 2010
B Credit Rating [Member]
Sep. 30, 2011
CCC Credit Rating [Member]
Dec. 31, 2010
CCC Credit Rating [Member]
Sep. 30, 2011
Other Credit Rating [Member]
Dec. 31, 2010
Other Credit Rating [Member]
Total carrying value of financing receivables$ 2,710 $ 2,752  $ 121$ 1,298$ 107$ 207$ 1,088$ 2,432$ 96$ 113
Percentage of internal credit default rates applied for receivables      12.70%  48.60%   
Reduction in allowance for losses on receivables$ (220)$ 24 $ 154$ 196