Income Taxes - Income (Loss) Before Income Taxes and Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income before income tax expense:
Domestic	$ 228	$ 355	$ 325
Foreign	878	766	656
Income before income tax expense	1,106	1,121	981
Current:
Federal	(15)	169	146
State	16	31	12
Foreign	150	40	38
Total current	151	240	196
Deferred:
Federal	40	1	26
State	(13)	(21)	(18)
Foreign	(38)	9	(58)
Total deferred	(11)	(11)	(50)
Income tax expense	$ 140	229	146
Add back benefit credited to additional paid-in capital:
Excess tax benefit associated with stock options		$ 65	$ 30