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Trade Accounts Receivable Securitization and Sale Programs (Sales Programs Activity) (Details) - Trade Accounts Receivable Sale Programs - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Trade Accounts Receivable Securitization and Sale Program [Line Items]      
Trade accounts receivable sold $ 6,751 $ 5,480 $ 2,968
Cash proceeds received 6,723 5,463 2,962
Pre-tax losses on sale of receivables $ 28 $ 17 $ 6