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Income Taxes, Balances (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Federal |  |
Income Tax [Line Items] |  |
Income taxes receivable |  | $ 33
Income taxes (payable) | $ (8) |
State |  |
Income Tax [Line Items] |  |
Income taxes receivable |  | $ 1

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