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Income Taxes Deferred Tax Asset Expiration Periods (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 260 | $ 178
Deferred Tax Assets, Capital Loss Carryforwards | 17 |
Foreign Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 112 |
Tax Credit Carryforwards | 17 |
State and Local Jurisdiction [Member] | Domestic Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Operating Loss Carryforwards | 3,700 |
Indefinite Tax Period [Member] | Domestic Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Operating Loss Carryforwards | 1,400 |
Expires from 2019 - 2037 [Member] | Domestic Tax Authority [Member] |  |
Income Tax Examination [Line Items] |  |
Operating Loss Carryforwards | 3,400 |
General Business Tax Credit Carryforward [Member] |  |
Income Tax Examination [Line Items] |  |
Tax Credit Carryforwards | 241 |
Capital Loss Carryforward [Member] |  |
Income Tax Examination [Line Items] |  |
Operating Loss Carryforwards | $ 17 |

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