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Trade Accounts Receivable Securitization and Sale Programs - Trade Accounts Receivable Sale Programs Amounts Recognized (Details) - Trade Accounts Receivable Sale Programs - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Trade Accounts Receivable Securitization and Sale Program [Line Items]        
Trade accounts receivable sold $ 1,719 $ 1,640 $ 3,553 $ 2,734
Cash proceeds received 1,712 1,636 3,538 2,728
Pre-tax losses on sale of receivables $ 7 $ 4 $ 15 $ 6