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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net increase to other comprehensive income or loss upon the translation $ (115) $ 64 $ (65)
Currency translation gains reclassified from accumulated other comprehensive income (loss) 25    
Changes in derivative financial instruments, net of tax 37 (99) 63
Changes in derivative financial instruments, tax $ 18 $ 39 $ 25