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Income Taxes NOL & Tax Credit Carryforwards and Undistributed Foreign Earnings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | $ 1,073 |
Deferred Tax Assets, Tax Credit Carryforwards | 64 | $ 108
Deferred Tax Assets, Valuation Allowance | 1,178 | 1,008
Undistributed Earnings of Foreign Subsidiaries [Abstract] |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings | 59 | 69
Foreign Tax Authority | Valuation Allowance, Operating Loss Carryforwards |  |
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract] |  |
Deferred Tax Assets, Valuation Allowance | 1,042 |
Foreign Tax Authority | Valuation Allowance, Tax Credit Carryforward |  |
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract] |  |
Deferred Tax Assets, Valuation Allowance | $ 62 | $ 49
Foreign Tax Authority | Minimum |  |
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Abstract] |  |
Operating Loss Carryforwards, Expiration Dates, Period | 1 year |

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