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Subordinated Notes and Debentures (Summary of Subordinated Notes and Debentures) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Apr. 22, 2025
Oct. 31, 2024
Disclosure of detailed information about borrowings [line items]      
Subordinated notes and debentures $ 10,733   $ 11,473
9.150% subordinated notes due May 26, 2025 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date May 26, 2025    
Interest rate (%) 9.15%    
Subordinated notes and debentures $ 0   200
3.105% subordinated debentures due April 22, 2030 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date April 22, 2030    
Interest rate (%) 3.105% 3.105%  
Earliest par redemption date Apr. 22, 2025    
Subordinated notes and debentures $ 0   2,989
4.859% subordinated debentures due March 4, 2031 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date March 4, 2031    
Interest rate (%) 4.859%    
Reset spread (%) 3.49%    
Earliest par redemption date Mar. 04, 2026    
Subordinated notes and debentures $ 1,252   1,257
3.625% subordinated debentures due September 15, 2031 [member[      
Disclosure of detailed information about borrowings [line items]      
Maturity date September 15, 2031    
Interest rate (%) 3.625%    
Reset spread (%) 2.205%    
Earliest par redemption date Sep. 15, 2026    
Subordinated notes and debentures $ 1,997   2,045
3.060% subordinated debentures due January 26, 2032 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date January 26, 2032    
Interest rate (%) 3.06%    
Reset spread (%) 1.33%    
Earliest par redemption date Jan. 26, 2027    
Subordinated notes and debentures $ 1,715   1,637
5.177% subordinated debentures due April 9, 2034 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date April 9, 2034    
Interest rate (%) 5.177%    
Reset spread (%) 1.53%    
Earliest par redemption date Apr. 09, 2029    
Subordinated notes and debentures $ 1,820   1,803
5.146% subordinated debentures due Septemeber 10, 2034 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date September 10, 2034    
Interest rate (%) 5.146%    
Reset spread (%) 1.50%    
Earliest par redemption date Sep. 10, 2029    
Subordinated notes and debentures $ 1,396   1,359
1.601% subordinated debentures due October 30, 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date October 30, 2034    
Interest rate (%) 1.601%    
Reset spread (%) 1.032%    
Earliest par redemption date Oct. 30, 2029    
Subordinated notes and debentures $ 181   183
4.030% subordinated debentures due January 23, 2036 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date January 23, 2036    
Interest rate (%) 4.03%    
Reset spread (%) 1.50%    
Earliest par redemption date Jan. 23, 2031    
Subordinated notes and debentures $ 1,209   0
4.231% subordinated debentures due February 1, 2036 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date February 1, 2035    
Interest rate (%) 4.231%    
Reset spread (%) 1.54%    
Earliest par redemption date Feb. 01, 2030    
Subordinated notes and debentures $ 1,009   0
2.058% subordinated debentures due September 25, 2036 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date September 25, 2035    
Interest rate (%) 2.058%    
Reset spread (%) 0.97%    
Earliest par redemption date Sep. 25, 2030    
Subordinated notes and debentures $ 127   0
5.930% subordinated debentures due July 23, 2040 [member]      
Disclosure of detailed information about borrowings [line items]      
Maturity date July 23, 2040    
Interest rate (%) 5.93%    
Reset spread (%) 1.87%    
Earliest par redemption date Jul. 23, 2035    
Subordinated notes and debentures $ 27   $ 0