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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance $ 14,160
Accumulated other comprehensive income (loss), Ending balance 13,976
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (1,104)
Accumulated other comprehensive income (loss) before reclassifications (225)
Amounts reclassified from accumulated other comprehensive income (loss) 6
Accumulated other comprehensive income (loss), Ending balance (1,323)
Derivative Financial Instruments, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance 7
Accumulated other comprehensive income (loss) before reclassifications 3
Amounts reclassified from accumulated other comprehensive income (loss) (2)
Accumulated other comprehensive income (loss), Ending balance 8
Defined Benefit Plans, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (13)
Accumulated other comprehensive income (loss), Ending balance (13)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (1,110)
Accumulated other comprehensive income (loss) before reclassifications (222)
Amounts reclassified from accumulated other comprehensive income (loss) 4
Accumulated other comprehensive income (loss), Ending balance $ (1,328)