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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance $ 7,846
Ending Balance 5,533
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (1,403)
Accumulated other comprehensive income (loss) before reclassifications (171)
Amounts reclassified from accumulated other comprehensive income (loss) 0
Ending Balance (1,574)
Derivative Financial Instruments, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (4)
Accumulated other comprehensive income (loss) before reclassifications (33)
Amounts reclassified from accumulated other comprehensive income (loss) 14
Ending Balance (23)
Defined Benefit Plans, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (16)
Accumulated other comprehensive income (loss) before reclassifications 0
Amounts reclassified from accumulated other comprehensive income (loss) 0
Ending Balance (16)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning Balance (1,423)
Accumulated other comprehensive income (loss) before reclassifications (204)
Amounts reclassified from accumulated other comprehensive income (loss) 14
Ending Balance $ (1,613)