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Derivative and Other Financial Instruments - Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivatives designated as net investment hedges | Designated as Hedging Instrument | Foreign exchange        
Derivative [Line Items]        
Amount of gain/(loss) recognized in AOCI $ (7) $ 36 $ 7 $ 8