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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 14,160 $ 14,003 $ 16,460
Ending Balance 13,889 14,160 14,003
Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,104) (1,376) (1,279)
Accumulated other comprehensive income (loss) before reclassifications (298) 272 (97)
Amounts reclassified from accumulated other comprehensive income (loss) 6    
Ending Balance (1,396) (1,104) (1,376)
Derivative Financial Instruments, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 7 (39) (205)
Accumulated other comprehensive income (loss) before reclassifications (19) 41 32
Amounts reclassified from accumulated other comprehensive income (loss) (2) 5 134
Ending Balance (14) 7 (39)
Defined Benefit Plans, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (13) (37) (69)
Accumulated other comprehensive income (loss) before reclassifications (13) 25 35
Amounts reclassified from accumulated other comprehensive income (loss) (1) (1) (3)
Ending Balance (27) (13) (37)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,110) (1,452) (1,553)
Accumulated other comprehensive income (loss) before reclassifications (330) 338 (30)
Amounts reclassified from accumulated other comprehensive income (loss) 3 4 131
Ending Balance $ (1,437) $ (1,110) $ (1,452)