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Income Taxes Level 4 Capital Loss Carryover (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 91 | $ 0
Deferred Tax Assets, Capital Loss Carryforwards | $ 32 | $ 0
Tax Year 2022 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2022 |

X
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