Income Taxes 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 60	$ 53	$ 24
Increases:
Current year tax positions	4	5	4
Tax positions related to prior years	37	4	26
Effects of foreign currency translation	1	0	0
Decreases:
Settlements with tax authorities	(3)	0	0
Lapse of statute of limitations	(1)	(2)	(1)
Balance, December 31	$ 98	$ 60	$ 53