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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) | $ 17 | $ 93 | $ (88)
Current state income tax expense | 1 | 8 | 11
Deferred federal income tax expense (benefit) | 20 | 61 | 43
Federal - valuation allowance adjustment |  |  | (11)
Deferred state income tax expense (benefit) | 2 | 10 | 2
State - valuation allowance adjustment |  |  | 38
Total income tax expense (benefit) | $ 40 | $ 172 | $ (5)

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