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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 13,889 $ 14,160 $ 14,003
Ending Balance 7,846 13,889 14,160
Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,396) (1,104) (1,376)
Accumulated other comprehensive income (loss) before reclassifications (7) (298) 272
Amounts reclassified from accumulated other comprehensive income (loss)   6  
Ending Balance (1,403) (1,396) (1,104)
Derivative Financial Instruments, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (14) 7 (39)
Accumulated other comprehensive income (loss) before reclassifications (2) (19) 41
Amounts reclassified from accumulated other comprehensive income (loss) 12 (2) 5
Ending Balance (4) (14) 7
Defined Benefit Plans, Net of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (27) (13) (37)
Accumulated other comprehensive income (loss) before reclassifications 12 (13) 25
Amounts reclassified from accumulated other comprehensive income (loss) (1) (1) (1)
Ending Balance (16) (27) (13)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1,437) (1,110) (1,452)
Accumulated other comprehensive income (loss) before reclassifications 3 (330) 338
Amounts reclassified from accumulated other comprehensive income (loss) 11 3 4
Ending Balance $ (1,423) $ (1,437) $ (1,110)