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Income Taxes Deferred Tax Asset Expiration Periods (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 178 | $ 175
Expires from 2018 - 2037 [Member] | Domestic Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 3,400 |
Expires from 2018 - 2037 [Member] | State and Local Jurisdiction [Member] | Domestic Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 3,200 |
Expires from 2029 - 2036 [Member] | Foreign Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 134 |
Does Not Expire [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 8 |
Expires 2018 - 2027 [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards | 147 |
Majority expire from 2018 - 2023 [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 21 |

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