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Derivative Financial Instruments and Hedging Activities (Cash Flow Hedges) (Details) - Cash flow hedging - Forward contracts - USD ($)
Feb. 28, 2021
Aug. 31, 2020
Derivative [Line Items]    
Aggregate notional amount $ 3,200,000,000 $ 2,900,000,000
Interest rate swaps | Debt obligations    
Derivative [Line Items]    
Aggregate notional amount $ 250,000,000.0