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Income Taxes Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 7 |
Deferred Tax Assets, Operating Loss Carryforwards | 1,249 | $ 935
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 260 | 178
Deferred Tax Assets, Valuation Allowance | 178 | 171
Tax Adjustments, Settlements, and Unusual Provisions | (8) |
Deferred Tax Assets, Capital Loss Carryforwards | 17 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Increase (Decrease) |  | (137)
Proceeds from Income Tax Refunds | 145 |
Capital Loss Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 17 |
Foreign Currency Gain (Loss) [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (6) |
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (4) |
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |
Valuation Allowance [Line Items] |  |
Deferred Tax Assets, Valuation Allowance | $ 140 | $ 133

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