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Post-Employment Benefits - Summary of Defined Benefit Assets (Liability) Net of Valuation Allowance Included in Other Assets and Other Liabilities (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability $ (457) $ (460)
Other assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit asset 1,678 1,378
Pension plan [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset (liability), net of valuation allowance 1,641 1,337
Pension plan [member] | Other assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit asset 1,678 1,378
Pension plan [member] | Other Liabilities [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (37) (41)
Other post employment benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit asset (liability), net of valuation allowance (420) (419)
Other post employment benefit plans [member] | Other Liabilities [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability $ (420) $ (419)