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Income Taxes (Details 4) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | $ 111 | $ 189 |
Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate | 10 |  |
Continuing Operations [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Accrued interest and penalties | 12 | 14 |
Unrecognized Tax Benefits | 113 | $ 100 | $ 91
U.S. state [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | 100 |  |
Internal Revenue Service (IRS) [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Tax Credit Carryforward, Valuation Allowance | 300 |  |
Timing of Anticipated Impact [Domain] | Continuing Operations [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Unrecognized Tax Benefits | $ 22 |  |

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