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Income Taxes (Deferred Tax Assets for Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Net operating losses | $ 449 |
Tax credits | 30 |
Deferred Tax Assets Loss And Tax Credit Carry Forward | 479 | $ 652
Tax Years 2018 Through 2022 [Member] |  |
Net operating losses | 121 |
Deferred Tax Assets Loss And Tax Credit Carry Forward | 121 |
Tax Years 2023 Through 2027 [Member] |  |
Net operating losses | 60 |
Deferred Tax Assets Loss And Tax Credit Carry Forward | 60 |
Tax Years 2028 Through 2037 [Member] |  |
Net operating losses | 25 |
Tax credits | 25 |
Deferred Tax Assets Loss And Tax Credit Carry Forward | 50 |
Indefinite [Member] |  |
Net operating losses | 243 |
Tax credits | 5 |
Deferred Tax Assets Loss And Tax Credit Carry Forward | $ 248 |

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