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Derivative and Other Financial Instruments - Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivatives designated as net investment hedges | Designated as Hedging Instrument | Foreign exchange    
Derivative [Line Items]    
Amount of gain/(loss) recognized in AOCI $ 61 $ 26