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Summary of major accounting policies - impaired assets (Details) - Selling, general and administrative expense - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Impairment charges   $ 234 $ 305
Cost Transformation Program      
Restructuring Cost and Reserve [Line Items]      
Impairment charges $ 57