Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (loss) before income tax benefit:
Domestic	$ 325	$ 626	$ 668
Foreign	656	693	790
Income before income tax expense	981	1,319	1,458
Current:
Federal	118	100	256
State	11	6	14
Foreign	37	31	49
Total Current	166	137	319
Deferred
Federal	26	134	12
State	(18)	(12)	(11)
Foreign	(58)	39	(11)
Total Deferred	(50)	161	(10)
Add back benefit credited to additional paid-in capital:
Excess tax benefit associated with stock options	30	11	0
Income tax expense	$ 146	$ 309	$ 309