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Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 3 | $ 13
Gain (Loss) on Investments [Member] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 1 | $ 26 | $ 3 | $ 23

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