Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 3,026	$ 2,591	$ 2,895	$ 2,587
Net change in accumulated other comprehensive income (loss)	2	59	(7)	(78)
Ending Balance	3,164	2,732	3,164	2,732
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(8)	(68)	(6)	61
Foreign Currency Translation Adjustment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,108)	(1,224)	(1,099)	(1,087)
Net change in accumulated other comprehensive income (loss)	2	59	(7)	(78)
Ending Balance	(1,106)	(1,165)	(1,106)	(1,165)
Net translation on investments in foreign operations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net change in accumulated other comprehensive income (loss)	29	275	14	(208)
Net hedges of investments in foreign operations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Net change in accumulated other comprehensive income (loss)	(27)	(216)	(21)	130
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(8)	(68)	(6)	41
Net translation on investments in foreign operations
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ 0	$ 0	$ 0	$ 20