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Income Taxes, Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income tax expense (benefit) |  |  |
Current federal income tax expense (benefit) | $ 29 | $ 97 | $ (79)
Current state income tax expense | (2) | 5 | 9
Deferred federal income tax expense (benefit) | 1 | 48 | 45
Deferred state income tax expense (benefit) | 5 | 7 | 7
State - valuation allowance adjustment |  |  | 6
Total income tax expense (benefit) | $ 33 | $ 157 | $ (12)

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