Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Non-U.S.	$ 31	$ 7	$ 22
Deferred
U.S. federal	0	(9)	(4)
State	0	2	0
Non-U.S.	1	1	24
Total income tax expense	$ 32	$ 1	$ 42