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Income Taxes Deferred Tax Assets, Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Tax Asset, Balance Sheet Location [Line Items] |  |
Deferred Tax Liabilities, Net | $ (90) | $ (37)
Long-term assets |  |
Deferred Tax Asset, Balance Sheet Location [Line Items] |  |
Deferred Tax Assets, Net | 143 | 185
Long-term liabilities |  |
Deferred Tax Asset, Balance Sheet Location [Line Items] |  |
Deferred Tax Liabilities, Net | $ (233) | $ (222)

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