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Financial instruments - variable prepaid forward transactions (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Aug. 04, 2023
Aug. 03, 2023
Jun. 15, 2023
May 11, 2023
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Derivatives, Fair Value [Line Items]              
Proceeds from variable prepaid forward         $ 2,568 $ 0 $ 0
Derivatives not designated as hedges:              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)         17,300    
Proceeds from variable prepaid forward         $ 2,568    
Derivatives not designated as hedges: | Variable Prepaid Forward Due Fourth Quarter Fiscal 2025              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)       4,600      
Proceeds from variable prepaid forward       $ 644      
Derivatives not designated as hedges: | Variable Prepaid Forward Due Third Quarter Fiscal 2025              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)     2,200        
Proceeds from variable prepaid forward     $ 325        
Derivatives not designated as hedges: | Variable Prepaid Forward Due First Quarter Fiscal 2026              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)   5,300          
Proceeds from variable prepaid forward   $ 801          
Derivatives not designated as hedges: | Variable Prepaid Forward Due Third Quarter Fiscal 2026              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares) 5,300            
Proceeds from variable prepaid forward $ 797