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Financial instruments - variable prepaid forward transactions (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Nov. 09, 2023
Aug. 04, 2023
Aug. 03, 2023
Jun. 15, 2023
May 11, 2023
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Derivatives, Fair Value [Line Items]                
Proceeds from variable prepaid forwards           $ 424 $ 2,568 $ 0
Derivatives not designated as hedges:                
Derivatives, Fair Value [Line Items]                
Pledged collateral (in shares)           20,000 17,300  
Proceeds from variable prepaid forwards           $ 2,991    
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 forwards         $ 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 forwards       $ 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 forwards     $ 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 forwards   $ 797            
Derivatives not designated as hedges: | Variable Prepaid Forward Due Fourth Quarter Fiscal 2026                
Derivatives, Fair Value [Line Items]                
Pledged collateral (in shares) 2,700              
Proceeds from variable prepaid forwards $ 424