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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
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