Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income before income tax expense:
Domestic	$ 355	$ 325	$ 626
Foreign	766	656	693
Income before income tax expense	1,121	981	1,319
Current:
Federal	169	146	110
State	31	12	7
Foreign	40	38	31
Total Current	240	196	148
Deferred
Federal	1	26	134
State	(21)	(18)	(12)
Foreign	9	(58)	39
Total Deferred	(11)	(50)	161
Income tax expense	229	146	309
Add back benefit credited to additional paid-in capital:
Excess tax benefit associated with stock options	$ 65	$ 30	$ 11