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Financial instruments - Summary of Variable Prepaid Forward Transactions (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 09, 2023
Aug. 04, 2023
Aug. 03, 2023
Jun. 15, 2023
May 11, 2023
Nov. 30, 2024
Nov. 30, 2023
Nov. 09, 2023
Derivatives, Fair Value [Line Items]                
Prepayment amount           $ 0 $ 424  
Derivatives not designated as hedges:                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares)               20.0
Prepayment amount               $ 2,991
Derivatives not designated as hedges: | Fourth quarter, fiscal 2025                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares)         4.6      
Prepayment amount         $ 644      
Derivatives not designated as hedges: | Third quarter, fiscal 2025                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares)       2.2        
Prepayment amount       $ 325        
Derivatives not designated as hedges: | First quarter, fiscal 2026                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares)     5.3          
Prepayment amount     $ 801          
Derivatives not designated as hedges: | Third quarter, fiscal 2026                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares)   5.3            
Prepayment amount   $ 797            
Derivatives not designated as hedges: | Fourth quarter, fiscal 2026                
Derivatives, Fair Value [Line Items]                
Shares pledged and maximum shares subject to forward sale (in shares) 2.7              
Prepayment amount $ 424