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IFRS 7 Disclosure - Credit and Counterparty Risk - Schedule of Total Credit Risk Exposures (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Repo style transactions [member]    
Disclosure of credit risk exposure [line items]    
Credit exposure $ 332,756 $ 270,482
Derivative and Repo Style Transactions [member]    
Disclosure of credit risk exposure [line items]    
Credit exposure exclusions at default based on Basel III classifications $ 8,137 $ 7,086
Other sector [member]    
Disclosure of credit risk exposure [line items]    
Credit exposure ratio 2.00% 2.00%