Asset-Backed Securitization Programs (Securitization Activity) (Details) - Asset-Backed Securitization Programs - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 28, 2021	Nov. 30, 2018	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Trade accounts receivable sold		$ 650	$ 4,222	$ 4,333	$ 4,057
Cash proceeds received		488	4,202	4,314	4,031
Proceeds due from bank			10	0	0
Pre-tax losses on sale of receivables			$ 10	$ 19	$ 26
Payment for previously transferred receivables	$ 99
Net Cash Received In Securitization Transactions		$ 14