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Derivative and Other Financial Instruments - Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |  |  |
Amount of gain/(loss) recognized in AOCI |  |  | $ 601 | $ (198)
Derivatives designated as net investment hedges | Other Comprehensive Income |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) On Derivative Used In Net Investment Hedge, Pretax | $ 40 | $ 61 | 81 | 61
Loss on net investment hedge settlements, net of tax | 40 | 61 | 81 | 61
Derivatives designated as net investment hedges | Designated as Hedging Instrument | Foreign exchange |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of gain/(loss) recognized in AOCI | $ 16 | $ (43) | $ 42 | $ (4)

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