Income Taxes - Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 18	$ (7)	$ (4)
State	4	1	2
Foreign	60	37	79
Deferred
Federal	12	23	(88)
State	1	(6)	(7)
Foreign	(3)	7	(30)
Total income tax expense (benefit)	$ 92	$ 55	$ (48)