Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense
U.S. federal	$ 13	$ 284	$ 67
U.S. state and local	(5)	14	5
Non-U.S.	51	63	66
Total current	59	361	138
Deferred income tax expense
U.S. federal	95	(87)	176
U.S. state and local	6	(5)	7
Non-U.S.	31	9	(4)
Total deferred	132	(83)	179
Total income tax provision	$ 191	$ 278	$ 317