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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net increase to other comprehensive income or loss upon the translation $ (18) $ (339) $ 79 $ (650)
Changes in derivative financial instruments, net of tax 60 (19) 191 7
Changes in derivative financial instruments, tax $ 20 $ (5) $ 72 $ 8