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Segmented and geographic information - Breakdown of revenue from reporting segments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of operating segments [line items]    
Revenue $ 29,133 $ 25,606
Canadian Personal and Business Banking [member]    
Disclosure of operating segments [line items]    
Revenue 12,031 10,942
Canadian Commercial Banking and Wealth Management [member]    
Disclosure of operating segments [line items]    
Revenue 6,902 6,018
Canadian Commercial Banking and Wealth Management [member] | Commercial banking [member]    
Disclosure of operating segments [line items]    
Revenue 2,710 2,465
Canadian Commercial Banking and Wealth Management [member] | Wealth management [member]    
Disclosure of operating segments [line items]    
Revenue 4,192 3,553
U.S. Commercial Banking and Wealth Management [member]    
Disclosure of operating segments [line items]    
Revenue 3,216 2,820
U.S. Commercial Banking and Wealth Management [member] | Commercial banking [member]    
Disclosure of operating segments [line items]    
Revenue 2,224 1,971
U.S. Commercial Banking and Wealth Management [member] | Wealth management [member]    
Disclosure of operating segments [line items]    
Revenue 992 849
Capital Markets [member]    
Disclosure of operating segments [line items]    
Revenue 6,148 4,800
Capital Markets [member] | Global Markets [member]    
Disclosure of operating segments [line items]    
Revenue 3,996 3,055
Capital Markets [member] | Corporate and investment banking [member]    
Disclosure of operating segments [line items]    
Revenue 2,152 1,745
Corporate and Other [member]    
Disclosure of operating segments [line items]    
Revenue 836 1,026
Corporate and Other [member] | International banking [member]    
Disclosure of operating segments [line items]    
Revenue 905 980
Corporate and Other [member] | Other [member]    
Disclosure of operating segments [line items]    
Revenue $ (69) $ 46