Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S.	$ (5)		$ 9
Non-U.S.	87	$ 123	85
Total	82	123	94
Deferred:
U.S.	6	3	10
Non-U.S.	(18)	(7)	2
Total	(12)	(4)	12
Total:
U.S.	1	3	19
Non-U.S.	69	116	87
Total for continuing operations	70	119	106
Total	$ 70	$ 119	$ 106