Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (1,087)
Ending balance	(1,224)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Net translation on investments in foreign operations	20	$ 3
Net hedges of investments in foreign operations	109	(18)
Total tax impact	129	(15)
Foreign Currency Translation Adjustment Gains (Losses) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,087)	(1,060)
Net translation losses of investments in foreign operations	(483)	64
Net gains (losses) related to hedges of investments in foreign operations	346	(57)
Net change in accumulated other comprehensive loss	(137)	7
Ending balance	$ (1,224)	$ (1,053)