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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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