Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Total current provision	$ 303	$ 350	$ 177
Total deferred benefit	448	66	33
(Provision) Benefit for Income Taxes	$ 145	$ (284)	$ (144)