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Subordinated Debt - Summary of Maturities of Subordinated Debt and Repayment (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
Oct. 31, 2025
USD ($)
Oct. 31, 2024
CAD ($)
Subordinated Liabilities [Line Items]      
Face value $ 21,343,075   $ 25,192,367
Total 8,500   8,377
Subordinated debt [member]      
Subordinated Liabilities [Line Items]      
Total 8,500   8,377
Subordinated debt [member] | Debentures Series 20 [member]      
Subordinated Liabilities [Line Items]      
Face value $ 150    
Maturity date December 2025 to 2040    
Interest rate (%) 8.25% 8.25%  
Redeemable at our option beginning in Not redeemable    
Total $ 147   147
Subordinated debt [member] | 3.803% Subordinated Notes due 2032 [member]      
Subordinated Liabilities [Line Items]      
Face value   $ 1,250  
Maturity date December 2032    
Interest rate (%) 3.803% 3.803%  
Subordinated Borrowings Reset Spread Rate 1.43%    
Redeemable at our option beginning in December 2027    
Total $ 1,656   1,602
Subordinated debt [member] | Series J Medium-Term Notes, Second Tranche [member]      
Subordinated Liabilities [Line Items]      
Face value $ 1,250    
Maturity date June 2030    
Interest rate (%) 2.077% 2.077%  
Redeemable at our option beginning in June 2025    
Total     1,237
Subordinated debt [member] | Series K Medium-Term Notes, First Tranche [member]      
Subordinated Liabilities [Line Items]      
Face value $ 1,000    
Maturity date July 2031    
Interest rate (%) 1.928% 1.928%  
Redeemable at our option beginning in July 2026    
Total $ 959   992
Subordinated debt [member] | 3.088% Subordinated Notes due 2037 [member]      
Subordinated Liabilities [Line Items]      
Face value   $ 1,250  
Maturity date January 2037    
Interest rate (%) 3.088% 3.088%  
Subordinated Borrowings Reset Spread Rate 1.40%    
Redeemable at our option beginning in January 2032    
Total $ 1,551   1,466
Subordinated debt [member] | Series L Medium-Term Notes, First Tranche [member]      
Subordinated Liabilities [Line Items]      
Face value $ 750    
Maturity date October 2032    
Interest rate (%) 6.534% 6.534%  
Subordinated Borrowings Reset Spread Rate 2.70%    
Redeemable at our option beginning in October 2027    
Total $ 749   732
Subordinated debt [member] | Series M Medium-Term Notes, First Tranche [member]      
Subordinated Liabilities [Line Items]      
Face value $ 1,150    
Maturity date September 2033    
Interest rate (%) 6.034% 6.034%  
Subordinated Borrowings Reset Spread Rate 2.02%    
Redeemable at our option beginning in September 2028    
Total $ 1,190   1,202
Subordinated debt [member] | Series M Medium-Term Notes, Second Tranche [member]      
Subordinated Liabilities [Line Items]      
Face value $ 1,000    
Maturity date July 2034    
Interest rate (%) 4.976% 4.976%  
Subordinated Borrowings Reset Spread Rate 1.63%    
Redeemable at our option beginning in July 2029    
Total $ 999   $ 999
Subordinated debt [member] | Series N MediumTerm Notes, First Tranche [Member]      
Subordinated Liabilities [Line Items]      
Face value $ 1,250    
Maturity date March 2035    
Interest rate (%) 4.077% 4.077%  
Subordinated Borrowings Reset Spread Rate 1.54%    
Redeemable at our option beginning in March 2030    
Total $ 1,249