Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense (benefit):
U.S. federal	$ 45	$ (14)	$ 785
U.S. state and local	13	(6)	15
Non-U.S.	23	84	24
Total current income tax expense	81	64	824
Deferred income tax expense (benefit):
U.S. federal	11	(28)	58
U.S. state and local	0	1	1
Non-U.S.	2	(8)	(5)
Total deferred income tax (benefit) expense	13	(35)	54
Total income tax expense	$ 94	$ 29	$ 878