Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 52	$ 59	$ 193
State	92	39	47
Non-U.S.	342	257	248
Total current expense	486	355	488
Deferred:
Federal	(39)	38	95
State	40	10	31
Non-U.S.	(169)	12	2
Total deferred (benefit) expense	(168)	60	128
Total income tax expense	$ 318	$ 415	$ 616