Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Non-U.S.	$ 7	$ 22	$ 40
Deferred
U.S. federal	(9)	(4)	(1)
State	2	0	0
Non-U.S.	1	24	(9)
Total income tax expense	$ 1	$ 42	$ 30