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Income Taxes Level 4 Current and Deferred Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Income (loss) from continuing operations before income taxes, domestic $ 878 $ 2,017 $ 1,736
Income (loss) from continuing operations before income taxes, foreign 74 (39) (37)
Current - U.S. Federal income tax expense (benefit) 12 (55) (62)
Current - International income tax expense (benefit) 0 3 2
Total current income tax expense (benefit) 12 (52) (60)
Deferred - U.S. Federal income tax expense (benefit) excluding NOL carryforward 101 (357) (410)
Deferred Foreign Income Tax Expense (Benefit) (3) 0 0
Deferred Income Tax Expense (Benefit) (104) 357 410
Income Tax Expense (Benefit) $ (92) $ 305 $ 350