Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax expense
U.S. federal	$ 0	$ 0	$ (1)
U.S. state and local	1	(4)	0
Non-U.S.	83	73	98
Total current	84	69	97
Deferred income tax expense
U.S. federal	133	(16)	(1)
U.S. state and local	75	31	13
Non-U.S.	31	27	(4)
Total deferred	239	42	8
Total income tax provision	$ 323	$ 111	$ 105