Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Income Tax Expense Benefit Continuing Operations [Abstract]
U.S. federal	$ (14)	$ 785	$ (4)
U.S. state and local	(6)	15	(6)
Non-U.S.	84	24	11
Total current income tax expense	64	824	1
Deferred income tax (benefit) expense:
U.S. federal	(28)	58	10
U.S. state and local	1	1	1
Non-U.S.	(8)	(5)	3
Total deferred income tax (benefit) expense	(35)	54	14
Total income tax expense	$ 29	$ 878	$ 15