Income Taxes - Schedule of Components of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
U.S.	$ (55)	$ 365	$ 159
Foreign	225	601	452
Total current	170	966	611
Deferred:
U.S.	(762)	(52)	(54)
Foreign	(47)	(18)	55
Total deferred	(809)	(70)	1
Provision for income taxes	$ (639)	$ 896	$ 612