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Share Capital - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2025
shares
Mar. 24, 2025
CAD ($)
shares
Nov. 05, 2024
USD ($)
Sep. 06, 2024
$ / shares
shares
Apr. 30, 2025
CAD ($)
shares
Jan. 31, 2025
CAD ($)
$ / shares
shares
Apr. 30, 2025
CAD ($)
shares
Apr. 30, 2025
CAD ($)
Oct. 31, 2023
Mar. 24, 2025
$ / shares
Oct. 31, 2024
Nov. 01, 2023
Disclosure of objectives, policies and processes for managing capital [line items]                        
Regulatory capital requirements, domestic Stability Buffer                       3.00%
Minimum leverage ratio 3.50%       3.50%   3.50% 3.50%        
Domestic systemically important bank buffer 0.50%       0.50%   0.50% 0.50%        
Minimum TLAC ratio 32.20%       32.20%   32.20% 32.20%     30.30%  
Minimum TLAC leverage ratio 9.10%       9.10%   9.10% 9.10%     8.70%  
Higher Buffer Rate [member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Regulatory capital requirements, domestic Stability Buffer 3.50%       3.50%   3.50% 3.50%        
Basel III requirement [member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Canada Domestic systemically important bank CET1 surcharge                 1.00%      
Minimum TLAC ratio 21.50%       21.50%   21.50% 21.50%        
Minimum TLAC leverage ratio 7.25%       7.25%   7.25% 7.25%        
Bottom of range [member] | Basel III requirement [member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
CET1 ratio         11.50%              
Tier 1 capital ratio         13.00%              
Total capital ratio         15.00%              
Minimum TLAC ratio 3.50%       3.50%   3.50% 3.50%        
Six Point Three Six Nine Percent Of Limited Recourse Capital Notes Series Six [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Borrowings, interest rate adjustment   3.65%                    
Floating interest rate [member] | Six Point Three Six Nine Percent Of Limited Recourse Capital Notes Series Six [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Borrowings, interest rate basis   Starting on April 28, 2030, and every five years thereafter until April 28, 2080, the interest rate will be reset to be equal to the then current five-year Government of Canada yield plus 3.65% per annum.                    
Floating interest rate [member] | Six Point Nine Fifty Percent Limited Recourse Capital Notes Series Five [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Borrowings, interest rate basis     Starting on January 28, 2030, and every five years thereafter until January 28, 2080, the interest rate will be reset to the then current five-year U.S. Treasury Rate plus 2.833% per annum.                  
Borrowings, interest rate adjustment     2.833%                  
Non Cumulative Rate Reset Series Sixty One Class Preferred Shares [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Dividend in addition to government of Canada bond yield   3.65%                    
Proceeds from issue of preference shares | $   $ 150                    
Par value per share | $ / shares                   $ 1,000    
Number of shares issued | shares   150,000                    
Ordinary shares [member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Purchase of common shares for cancellation, Number of shares | shares         6,000,000   9,500,000          
Reduction of issued capital | $         $ 109   $ 172          
Non Cumulative Rate Reset Series Forty One Class Preferred Shares [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Number Of Shares Redeemed | shares           12,000,000            
Redemption price per share | $ / shares           $ 0.25            
Reduction of issued capital | $           $ 300            
Normal Course Issuer Bid [Member] | XTSE [Member] | Ordinary shares [member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Purchase of common shares for cancellation, Number of shares | shares       6,000,000                
Threshold Date On Or Before Which Share Repurchase Shall Be Completed       Sep. 09, 2025                
Share repurchase, average price per share | $ / shares       $ 81.53                
Stock repurchased and cancelled during the period shares | shares 14,500,000           9,500,000          
Share Repurchase Eligible Subject To Purchase Of Common Shares Threshold Minimum | shares       20,000,000                
Reduction of issued capital | $         $ 490   $ 810 $ 1,229        
January 28, 2030 [member] | Six Point Three Six Nine Percent Of Limited Recourse Capital Notes Series Six [Member] | Limited Recourse Capital Notes Series [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Borrowings maturity   April 28, 2085                    
Borrowings, interest rate   6.369%                    
Notional amount | $   $ 450                    
January 28, 2030 [member] | Six Point Nine Fifty Percent Limited Recourse Capital Notes Series Five [Member] | Limited Recourse Capital Notes Series [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Borrowings maturity     January 28, 2085                  
Borrowings, interest rate     6.95%                  
Notional amount | $     $ 500                  
Restatement [Member] | Non Cumulative Rate Reset Series Sixty One Class Preferred Shares [Member]                        
Disclosure of objectives, policies and processes for managing capital [line items]                        
Dividend Payable Rate Percentage   6.369%