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Schedule of Information Related to Amounts Recorded Related to Frequent Flyer Programs (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Cash Proceeds from Miles Sold $ 2,852 $ 3,121 $ 2,156
Other Revenue Recognized Upon Award of Miles to Third-Party Customers 816 [1] 566 [1] 331 [1]
Increase in Frequent Flyer Deferred Revenue for Miles Awarded 2,036 [2] 2,357 [2] 1,739 [2]
Net Increase in Advanced Purchase of Miles   $ 198 [3] $ 86 [3]
[1] This amount represents other revenue recognized during the period from the sale of miles to third parties, representing the marketing services component of the sale.
[2] This amount represents the increase to frequent flyer deferred revenue during the period.
[3] This amount represents the net increase in the advance purchase of miles obligation due to cash payments for the sale of miles in excess of miles awarded to customers.