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New accounting pronouncements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2018
Nov. 30, 2017
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 expenses $ 6,280 $ 5,910        
Other income (expense) $ 26 $ (134)        
Cumulative effect of new accounting principle in period of adoption     $ (88)      
Accounting Standards Update 2017-07            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Selling, general and administrative expenses     (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 in period of adoption     $ (88)      
Retained earnings | Accounting Standards Update 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle in period of adoption           $ 98