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Derivative Instruments - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Obligation to exercise the option $ 146 $ 67
Derivative instruments in a liability position 10,894 9,656
Derivative instruments in a liability position, collateral posted 9,117 8,882
Loan commitment derivatives with notional 6,219 $ 2,498
Credit risk [member]    
Disclosure of detailed information about financial instruments [line items]    
Obligation to exercise the option $ 0