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IFRS 7 Disclosure - Market Risk - Structural Balance Sheet Interest Rate Sensitivity (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Hundred basis point increase [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity $ (1,736) $ (1,483)
Pre tax earnings sensitivity over the next twelve month 357 367
Hundred basis point increase [member] | Canada [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity (986)  
Pre tax earnings sensitivity over the next twelve month 104  
Hundred basis point increase [member] | United States [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity (750)  
Pre tax earnings sensitivity over the next twelve month 252  
Hundred basis point decrease [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity 1,063 660
Pre tax earnings sensitivity over the next twelve month (322) $ (210)
Hundred basis point decrease [member] | Canada [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity 983  
Pre tax earnings sensitivity over the next twelve month (26)  
Hundred basis point decrease [member] | United States [member]    
Market Risk [Line Items]    
Pre tax economic value sensitivity 80  
Pre tax earnings sensitivity over the next twelve month $ (296)