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Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Foreign Currency Transaction Gain (Loss), before Tax     $ (6) $ 2
Gain (Loss) on Investments [Member]        
Foreign Currency Transaction Gain (Loss), before Tax $ 3 $ (2) $ (3) $ 0