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Income Taxes - Components of Provision for Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 700 $ 484 $ 421
State 48 37 34
Foreign 371 768 448
Total current income tax provision 1,119 1,289 903
Deferred:      
Federal (151) (28) (260)
State   (3) (8)
Foreign 54 (321) 103
Total deferred income tax provision (97) (352) (165)
Total income tax provision $ 1,022 $ 937 $ 738