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Components of Deferred Tax Assets and Liabilities (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Frequent Flyer
 
Deferred Income Tax Assets And Liabilities [Line Items]  
Deferred tax assets adjustments $ 257
Employee Benefits
 
Deferred Income Tax Assets And Liabilities [Line Items]  
Deferred tax assets adjustments $ 187