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Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 2 | $ 19
Gain (Loss) on Investments [Member] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ (2) | $ 7 | $ 0 | $ 30

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