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Supplemental information - Depreciation and Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Supplemental Cash Flow Elements [Abstract]    
Depreciation expense $ 360 $ 359
Intangible asset and other amortization 115 118
Total depreciation and amortization expense $ 475 $ 477