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Trade Accounts Receivable Securitization and Sale Programs - Asset-Backed Securitization Programs Amounts Recognized (Details) - Asset-Backed Securitization Programs - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Trade Accounts Receivable Securitization and Sale Program [Line Items]        
Eligible trade accounts receivable sold $ 2,057 $ 2,156 $ 4,449 $ 4,499
Cash proceeds received 1,507 1,687 3,895 4,028
Pre-tax losses on sale of receivables 3 2 7 4
Deferred purchase price receivables as of February 28 $ 547 $ 467 $ 547 $ 467