Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective income tax rate
U.S. federal income tax rate	$ (108)	$ (109)	$ (53)
Foreign tax rate variances	(1)	(8)	1
State taxes, net of federal benefit	(7)	(6)	0
Tax credits	(6)	(7)	(9)
Change in Valuation Allowances	113	120	79
Non-Controlling Interest	0	2	3
Earnings of equity investments	14	15	13
Withholding taxes	3	4	5
Tax on divestiture	23	0	0
Convertible debt	0	(10)	0
Other, net	1	0	3
Total income tax expense	$ 32	$ 1	$ 42