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Subordinated Debt - Summary of Maturities of Subordinated Debt and Repayment (Parenthetical) (Detail)
$ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
Oct. 31, 2024
CAD ($)
Oct. 31, 2025
$ / shares
Mar. 05, 2025
CAD ($)
Subordinated Liabilities [Line Items]        
Repayments of subordinated liabilities $ 1,250 $ 1,000    
Subordinated liabilities 8,500 8,377    
Subordinated debt [member]        
Subordinated Liabilities [Line Items]        
Increase (Decrease) in Subordinated Long Term Debt (304) (400)    
Subordinated liabilities $ 8,500 8,377    
Bottom of range [member] | Subordinated debt [member]        
Subordinated Liabilities [Line Items]        
Common stock conversion price | $ / shares     $ 5  
3.803% Subordinated Notes due 2032 [member]        
Subordinated Liabilities [Line Items]        
Borrowings, interest rate basis 5-year mid-swap rate plus the reset premium noted.      
3.803% Subordinated Notes due 2032 [member] | Subordinated debt [member]        
Subordinated Liabilities [Line Items]        
Interest rate 3.803%      
Subordinated liabilities $ 1,656 1,602    
Series J Medium Term Notes Second Tranche [Member] | Subordinated debt [member]        
Subordinated Liabilities [Line Items]        
Interest rate 2.077%      
Repayments of subordinated liabilities $ 1,250      
Percentage of redemption of principal amount plus unpaid accrued interest 100.00%      
Subordinated liabilities   1,237    
Series M Medium-Term Notes, Second Tranche [member] | Subordinated debt [member]        
Subordinated Liabilities [Line Items]        
Interest rate 4.976%      
Subordinated liabilities $ 999 $ 999    
Series M Medium-Term Notes, Second Tranche [member] | Unsecured Subordinated Debt [Member]        
Subordinated Liabilities [Line Items]        
Subordinated debt earliest date of redemption at par value Mar. 05, 2030      
Subordinated liabilities       $ 1,250