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Income Taxes, Net Operating Losses (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
State |
Operating Loss Carryforwards [Line Items] |
State NOL carryforwards | $ 1,845
Deferred tax asset for State NOL carryforwards | $ 70
State | Minimum |
Operating Loss Carryforwards [Line Items] |
Expiration of NOL carryforwards | Dec. 31, 2017
State | Maximum |
Operating Loss Carryforwards [Line Items] |
Expiration of NOL carryforwards | Dec. 31, 2036
Federal |
Operating Loss Carryforwards [Line Items] |
Deferred tax asset for Federal NOL carryforward | $ 18
Federal | Minimum |
Operating Loss Carryforwards [Line Items] |
Expiration of NOL carryforwards | Dec. 31, 2018
Federal | Maximum |
Operating Loss Carryforwards [Line Items] |
Expiration of NOL carryforwards | Dec. 31, 2036

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