Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning	$ 12
Share of profit or loss attributable to redeemable noncontrolling interests	2	$ 3
Balance at end	39		$ 12
Payments to Acquire Additional Interest in Subsidiaries			14
Redeemable Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning	98	99	99
Impact of foreign exchange translation	2	19
Share of profit or loss attributable to redeemable noncontrolling interests	1	2
Redemption value adjustment for the current period	1	(6)
Measurement period adjustments		(1)
Exercises of redeemable noncontrolling interests		10
Balance at end	$ 102	$ 103	$ 98