Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective income tax rate
U.S. federal income tax rate	$ (53)	$ (110)	$ (8)
Foreign tax rate variances	1	9	(2)
State taxes, net of federal benefit	0	(2)	(1)
Tax credits	(9)	(10)	(9)
Change in Valuation Allowances	79	62	51
Non-Controlling Interest	3	21	1
Earnings of equity investments	13	7	0
Withholding taxes	5	4	4
Goodwill impairment	0	13	0
Change in U.S. tax rate	0	35	0
Other, net	3	2	1
Total income tax expense	$ 42	$ 30	$ 38