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Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits balance | $ 34 | $ 34 | $ 52 | $ 56
Addition based on tax positions related to the current year | 0 | 0 | 2 |
Increase for tax positions of prior years | 6 | 0 | 0 |
Decrease for tax positions of prior years | 0 | (3) | (1) |
Decrease for statute of limitation expiration | $ (6) | $ (15) | $ (5) |

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