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Insurance - Summary of Sensitivities of Earning to Increase or Decreases in Policy-related Assumptions (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Gross carrying amount [member] | Actuarial assumption of mortality rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Mortality Rates (1% increase) CSM Gross $ (8) $ (17)
Mortality Rates (1% increase) Profit or Loss Gross 1 1
Gross carrying amount [member] | Actuarial Assumption of Lapse Rates [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Lapse Rates (10% increase) CSM Gross (45) (151)
Lapse Rates (10% increase) Profit or Loss Gross (82) (10)
Gross carrying amount [member] | Actuarial Assumption of Expenses [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Expenses (5% increase) CSM Gross (14) (15)
Expenses (5% increase) Profit or Loss Gross (1)  
Net amount [Member] | Actuarial assumption of mortality rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Mortality Rates (1% increase) CSM Net 15 10
Mortality Rates (1% increase) Profit or Loss Net 2 1
Net amount [Member] | Actuarial Assumption of Lapse Rates [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Lapse Rates (10% increase) CSM Net 38 (52)
Lapse Rates (10% increase) Profit or Loss Net (74) (4)
Net amount [Member] | Actuarial Assumption of Expenses [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Expenses (5% increase) CSM Net (14) $ (15)
Expenses (5% increase) Profit or Loss Net $ (1)