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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]    
Net increase to Other Comprehensive Income or Loss upon the translation $ (117) $ 65
Changes in derivative financial instruments, net of tax (48) 63
Changes in derivative financial instruments, tax $ 19 $ 25