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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]        
Net increase to other comprehensive income or loss upon the translation $ 114 $ (121) $ 63 $ (238)
Changes in derivative financial instruments, net of tax (25) (22) (11) (70)
Changes in derivative financial instruments, tax $ (10) $ (8) $ (4) $ (27)