Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,732	$ 2,396	$ 2,587	$ 2,196
Net change in accumulated other comprehensive loss	10	(24)	(68)	(39)
Ending Balance	2,768	2,482	2,768	2,482
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Net translation on investments in foreign operations	(1)	(1)	19	2
Net hedges of investments in foreign operations	(19)	15	22	9
Total tax impact	(20)	14	41	11
Foreign Currency Translation Adjustment Gains (Losses) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,165)	(1,075)	(1,087)	(1,060)
Net translation gains (losses) of investments in foreign operations	69	(74)	(139)	(68)
Net gains (losses) related to hedges of investments in foreign operations	(59)	50	71	29
Net change in accumulated other comprehensive loss	10	(24)	(68)	(39)
Ending Balance	$ (1,155)	$ (1,099)	$ (1,155)	$ (1,099)