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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net increase to other comprehensive income or loss upon the translation $ 272 $ (97) $ (764)
Changes in derivative financial instruments, net of tax 46 166 23
Changes in derivative financial instruments, tax $ 13 $ 65 $ 14