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Employee Compensation - Pension and Other Employee Future Benefits - Summary of Cash payments in connection with employee future benefit plans (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Pension Plans [member]    
Disclosure of defined benefit plans and defined contribution plans [Line Items]    
Net contributions (refund) $ 4 $ (25)
Contributions to defined contribution plans 306 290
Benefits paid directly to pensioners 51 50
Cash payments made for employee future benefit plans 361 315
Other employee future benefit plans [member]    
Disclosure of defined benefit plans and defined contribution plans [Line Items]    
Net contributions (refund) 0  
Contributions to defined contribution plans 0  
Benefits paid directly to pensioners 47 45
Cash payments made for employee future benefit plans $ 47 $ 45