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Derivative and Other Financial Instruments - Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivatives designated as net investment hedges | Designated as Hedging Instrument | Foreign exchange |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of gain/(loss) recognized in AOCI | $ (43) | $ 40 | $ (4) | $ 47

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