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Asset-Backed Securitization Programs (Securitization Activity) (Details) - Asset-Backed Securitization Programs - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Trade Accounts Receivable Securitization and Sale Program [Line Items]    
Trade accounts receivable sold $ 1,173 $ 1,162
Cash proceeds received 1,171 1,156
Pre-tax losses on sale of receivables $ 2 $ 6