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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 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 14,151
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 36
Accumulated other comprehensive income (loss), Ending balance (1,068)
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 16
Amounts reclassified from accumulated other comprehensive income (loss) (3)
Accumulated other comprehensive income (loss), Ending balance 20
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 52
Amounts reclassified from accumulated other comprehensive income (loss) (3)
Accumulated other comprehensive income (loss), Ending balance $ (1,061)