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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net increase to other comprehensive income or loss upon the translation $ (46) $ 107 $ 97 $ (311)
Changes in derivative financial instruments, net of tax 29 92 131 26
Changes in derivative financial instruments, tax $ 12 $ 34 $ 52 $ 13