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Derivatives Balance Sheet Location (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Derivatives, Fair Value [Line Items]      
Debt Instrument, Fair Value Disclosure $ 730 $ 390  
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Fair Value, Net     $ 2