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New accounting pronouncements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Sep. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Selling, general and administrative expense $ 6,235 $ 6,235 $ 18,834 $ 18,466        
Other income (expense) $ 182 $ 0 $ 227 $ (122)        
Cumulative effect of new accounting principle               $ (88)
Accounting standards update 2017-07                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Selling, general and administrative expense         $ (125) $ (73) $ 69  
Other income (expense)         $ 125 $ 73 $ (69)  
Retained earnings                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cumulative effect of new accounting principle               (88)
Retained earnings | Accounting standards update 2014-09                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Cumulative effect of new accounting principle               $ 98