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Share Capital - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Nov. 05, 2024
USD ($)
Sep. 06, 2024
CAD ($)
shares
Sep. 06, 2024
$ / shares
shares
Jan. 31, 2025
CAD ($)
$ / shares
shares
Oct. 31, 2023
Oct. 31, 2024
Nov. 01, 2023
Disclosure of objectives, policies and processes for managing capital [line items]              
Reduction of issued capital       $ 63      
Regulatory capital requirements, domestic Stability Buffer             3.00%
Minimum leverage ratio       3.50%      
Domestic systemically important bank buffer       0.50%      
Minimum TLAC ratio       31.40%   30.30%  
Minimum TLAC leverage ratio       8.90%   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%      
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%      
Minimum TLAC leverage ratio       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%      
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%            
Ordinary shares [member]              
Disclosure of objectives, policies and processes for managing capital [line items]              
Purchase of common shares for cancellation, Number of shares | shares       3,500,000      
Reduction of issued capital       $ 63      
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   3,500,000          
Threshold Date On Or Before Which Share Repurchase Shall Be Completed   Sep. 09, 2025          
Shares Repurchased And Cancelled Average Price Per Share | $ / shares     $ 91.59        
Share Repurchase Eligible Subject To Purchase Of Common Shares Threshold Minimum | shares   20 20        
Reduction of issued capital   $ 320          
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