Income Taxes Level 4 Income (loss) Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income (loss) from continuing operations before income taxes, domestic	$ 2,017	$ 1,736	$ 1,473
Income (loss) from continuing operations before income taxes, foreign	(39)	(37)	(2)
Current - U.S. Federal income tax expense (benefit)	(55)	(62)	219
Current - International income tax expense (benefit)	3	2	0
Total current income tax expense (benefit)	(52)	(60)	219
Deferred - U.S. Federal income tax expense (benefit) excluding NOL carryforward	357	410	27
Income Tax Expense (Benefit)	$ 305	$ 350	$ 246