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Derivative Financial Instruments and Hedging Activities (Foreign Currency Risk Management) (Details) - Forward contracts - USD ($) $ in Millions | Aug. 31, 2021 | Aug. 31, 2020
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Cash flow hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 3,600 | $ 2,900
Forward foreign exchange contracts |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 1,500 | $ 355

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