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Equity (Summary of Classes of Share Capital - Preferred Shares Terms and Conditions) (Parenthetical) (Details)
shares in Millions
 12 Months Ended
Oct. 31, 2025
$ / shares
shares
Oct. 31, 2025
$ / shares
shares
Oct. 31, 2024
shares
Disclosure of classes of share capital [line items]      
Number of shares | shares 1,689 1,689 1,750
Preferred shares redemption period per cycle after the optional date 5 years 5 years  
Preferred shares period per cycle when floating preferred shares are eligible for conversion into fixed preferred shares 5 years 5 years  
Floating Rate Preferred Shares [Member] | Ninety Day Government Of Canada Treasury Bill Yield [Member]      
Disclosure of classes of share capital [line items]      
Dividend rate for quarterly period 90 days 90 days  
Rate reset preferred shares series 1 [Member]      
Disclosure of classes of share capital [line items]      
Annual yield 4.97% 4.97%  
Rate reset preferred shares series 26 [Member]      
Disclosure of classes of share capital [line items]      
Note issued price per share $ 1,000    
Rate reset preferred shares series 29 [Member]      
Disclosure of classes of share capital [line items]      
Note issued price per share $ 1,000    
Rate reset preferred shares series 30 [Member]      
Disclosure of classes of share capital [line items]      
Note issued price per share   $ 1,000  
Rate reset preferred shares series 18 [Member]      
Disclosure of classes of share capital [line items]      
Annual yield 5.747% 5.747%  
Rate Reset Preferred Shares [Member] | Floating Rate Preferred Shares [Member]      
Disclosure of classes of share capital [line items]      
Next redemption/conversion date, period 5 years 5 years  
NVCC Perpetual Subordinated Capital Notes [Member]      
Disclosure of classes of share capital [line items]      
Period after which the interest rate will be reset 5 years 5 years  
Issued capital [member] | Rate Reset Preferred Shares [Member] | Floating Rate Preferred Shares [Member] | Five Year Government Of Canada [Member]      
Disclosure of classes of share capital [line items]      
Next redemption/conversion date, period 5 years 5 years  
Issued capital [member] | Limited Recourse Capital Notes Series One [Member] | Five Year Government Of Canada [Member]      
Disclosure of classes of share capital [line items]      
Period after which the interest rate will be reset 5 years 5 years  
Issued capital [member] | Limited Recourse Capital Notes Series Two [Member] | Five Year Government Of Canada [Member]      
Disclosure of classes of share capital [line items]      
Period after which the interest rate will be reset 5 years 5 years  
Issued capital [member] | NVCC Series Three [Member] | Five Year US Treasury Yield [Member]      
Disclosure of classes of share capital [line items]      
Period after which the interest rate will be reset 5 years 5 years