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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning balance $ (1,452) $ (1,553) $ (834)
Accumulated other comprehensive income (loss) before reclassifications 338 (30) (914)
Amounts reclassified from accumulated other comprehensive income (loss) 4 131 195
Accumulated other comprehensive income (loss), Ending balance (1,110) (1,452) (1,553)
Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning balance (1,376) (1,279) (515)
Accumulated other comprehensive income (loss) before reclassifications 272 (97) (764)
Accumulated other comprehensive income (loss), Ending balance (1,104) (1,376) (1,279)
Derivative Financial Instruments, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning balance (39) (205) (228)
Accumulated other comprehensive income (loss) before reclassifications 41 32 (176)
Amounts reclassified from accumulated other comprehensive income (loss) 5 134 199
Accumulated other comprehensive income (loss), Ending balance 7 (39) (205)
Defined Benefit Plans, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), Beginning balance (37) (69) (91)
Accumulated other comprehensive income (loss) before reclassifications 25 35 26
Amounts reclassified from accumulated other comprehensive income (loss) (1) (3) (4)
Accumulated other comprehensive income (loss), Ending balance $ (13) $ (37) $ (69)