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Derivative and Other Financial Instruments - Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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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

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