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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net increase to other comprehensive income or loss upon the translation $ (223) $ 76 $ (187) $ 166
Changes in derivative financial instruments, net of tax (14) 23 (1) 28
Changes in derivative financial instruments, tax $ 5 $ 6 $ 0 $ 7