Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,895	$ 2,587
Net change in accumulated other comprehensive income (loss)	(9)	(137)
Ending Balance	3,026	2,591
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	2	129
Foreign Currency Translation Adjustment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,099)	(1,087)
Net change in accumulated other comprehensive income (loss)	(9)	(137)
Ending Balance	(1,108)	(1,224)
Net Translation On Investments In Foreign Operations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net change in accumulated other comprehensive income (loss)	(15)	(483)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	0	20
Net Hedges Of Investments In Foreign Operations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net change in accumulated other comprehensive income (loss)	6	346
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ 2	$ 109