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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]    
Net increase to other comprehensive income or loss upon the translation $ (51) $ (117)
Changes in derivative financial instruments, net of tax 14 (48)
Changes in derivative financial instruments, tax $ 6 $ (19)