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Trade Accounts Receivable Sale Programs (Trade Accounts Receivable Sale Programs Amounts Recognized) (Details) - Trade Accounts Receivable Sale Programs - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Trade Accounts Receivable Securitization and Sale Program [Line Items]      
Trade accounts receivable sold $ 4,654 $ 8,457 $ 6,751
Cash proceeds received 4,651 8,440 6,723
Pre-tax losses on sale of receivables $ 3 $ 17 $ 28