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Asset-Backed Securitization Programs (Securitization Activity) (Details) - Asset-Backed Securitization Programs - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Trade Accounts Receivable Securitization and Sale Program [Line Items]        
Trade accounts receivable sold $ 1,140 $ 1,095 $ 2,313 $ 2,257
Cash proceeds received 1,137 1,089 2,308 2,245
Pre-tax losses on sale of receivables $ 3 $ 6 $ 5 $ 12