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Operating and Geographic Segmentation - Additional Information (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
Professionals
Locations
Business
Oct. 31, 2024
CAD ($)
Disclosure of operating segments [line items]    
Number of operating groups | Business 4  
Taxable equivalent basis adjustment amount | $ $ 39 $ 58
Capital Markets [Member]    
Disclosure of operating segments [line items]    
Number of professionals in lines of business | Professionals 2,700  
Number of operating locations | Locations 38