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Financial instruments - Summary of Variable Prepaid Forward Transactions (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Nov. 09, 2023
Aug. 04, 2023
Aug. 03, 2023
Jun. 15, 2023
May 11, 2023
Nov. 30, 2023
Nov. 30, 2022
Derivatives, Fair Value [Line Items]              
Proceeds from variable prepaid forward contracts           $ 424 $ 0
Not Designated as Hedging Instrument              
Derivatives, Fair Value [Line Items]              
Proceeds from variable prepaid forward contracts           $ 2,991  
Not Designated as Hedging Instrument | Variable Prepaid Forward Due Fourth Quarter Fiscal 2025              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)         4.6    
Proceeds from variable prepaid forward contracts         $ 644    
Not Designated as Hedging Instrument | Variable Prepaid Forward Due Third Quarter Fiscal 2025              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)       2.2      
Proceeds from variable prepaid forward contracts       $ 325      
Not Designated as Hedging Instrument | Variable Prepaid Forward Due First Quarter Fiscal 2026              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)     5.3        
Proceeds from variable prepaid forward contracts     $ 801        
Not Designated as Hedging Instrument | Variable Prepaid Forward Due Third Quarter Fiscal 2026              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares)   5.3          
Proceeds from variable prepaid forward contracts   $ 797          
Not Designated as Hedging Instrument | Variable Prepaid Forward Due Fourth Quarter Fiscal 2026              
Derivatives, Fair Value [Line Items]              
Pledged collateral (in shares) 2.7            
Proceeds from variable prepaid forward contracts $ 424