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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance $ 13,889
Accumulated other comprehensive income (loss) before reclassifications 42
Amounts reclassified from accumulated other comprehensive income (loss) 3
Ending Balance 8,487
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (1,396)
Accumulated other comprehensive income (loss) before reclassifications 38
Amounts reclassified from accumulated other comprehensive income (loss) 0
Ending Balance (1,358)
Derivative Financial Instruments, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (14)
Accumulated other comprehensive income (loss) before reclassifications 4
Amounts reclassified from accumulated other comprehensive income (loss) 3
Ending Balance (7)
Defined Benefit Plans, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (27)
Accumulated other comprehensive income (loss) before reclassifications 0
Amounts reclassified from accumulated other comprehensive income (loss) 0
Ending Balance (27)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (1,437)
Ending Balance $ (1,392)