Income Taxes - Summary of the Components of Our Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax expense:
Federal	$ 38	$ 48	$ 93
State	2	8	14
Foreign	11	22	6
Current income tax expense	51	78	113
Deferred income tax (benefit) expense:
Federal	(12)	(29)	(12)
State	(3)	(2)	(1)
Foreign	(5)	(6)	(4)
Deferred income tax (benefit) expense:	(20)	(37)	(17)
Provision for income taxes	$ 31	$ 41	$ 96