Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S.	$ 8	$ (5)
Non-U.S.	109	87	$ 123
Total	117	82	123
Deferred:
U.S.		6	3
Non-U.S.	(9)	(18)	(7)
Total	(9)	(12)	(4)
Total:
U.S.	8	1	3
Non-U.S.	100	69	116
Provision for income taxes	108	70	119
Total	$ 108	$ 70	$ 119