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Equity - Summary of Classes of Preferred and Common Shares Outstanding (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 31, 2025
CAD ($)
$ / shares
shares
Oct. 31, 2025
$ / shares
Oct. 31, 2024
CAD ($)
$ / shares
shares
Oct. 31, 2024
$ / shares
Disclosure of classes of share capital [line items]        
Balance at beginning of year $ 84,286      
Balance at end of year $ 88,100   $ 84,286  
Class B Series 31 [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 12,000,000      
Balance at end of year (shares) | shares     12,000,000  
Balance at beginning of year $ 300      
Balance at end of year     $ 300  
Dividend declared per share | $ / shares       $ 0.96
Class B Series 33 [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 8,000,000      
Balance at end of year (shares) | shares     8,000,000  
Balance at beginning of year $ 200      
Balance at end of year     $ 200  
Dividend declared per share | $ / shares   $ 0.57   0.76
Class B Series 44 [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 16,000,000      
Balance at end of year (shares) | shares 16,000,000   16,000,000  
Balance at beginning of year $ 400      
Balance at end of year $ 400   $ 400  
Dividend declared per share | $ / shares   1.7   1.7
Class B Series 50 [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 500,000      
Balance at end of year (shares) | shares 500,000   500,000  
Balance at beginning of year $ 500      
Balance at end of year $ 500   $ 500  
Dividend declared per share | $ / shares   73.73   73.73
Class B Series 52 [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 650,000      
Balance at end of year (shares) | shares 650,000   650,000  
Balance at beginning of year $ 650      
Balance at end of year 650   $ 650  
Dividend declared per share | $ / shares   70.57   70.57
Preferred shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 2,050      
Balance at end of year 1,550   2,050  
Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 6,037      
Balance at end of year 7,406   6,037  
Preferred Shares and Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 8,087   6,958  
Balance at end of year $ 8,956   $ 8,087  
Common Shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year (shares) | shares 729,529,876   720,909,161  
Issued under the Shareholder Dividend Reinvestment and Share Purchase Plan (shares) | shares     7,790,724  
Issued under the Stock Option Plan and other stock-based compensation plans (shares) | shares 1,520,631   811,652  
Purchased for cancellation and treasury shares sold/purchased (shares) | shares (22,200,000)      
Treasury shares sold | shares 55,172   18,339  
Balance at end of year (shares) | shares 708,905,679   729,529,876  
Balance at beginning of year $ 23,921   $ 22,941  
Issued under the Shareholder Dividend Reinvestment and Share Purchase Plan     905  
Issued under the Stock Option Plan and other stock-based compensation plans 161   74  
Treasury shares sold 7   1  
Purchased for cancellation and treasury shares sold/purchased (730)      
Balance at end of year $ 23,359   $ 23,921  
Dividend declared per share | (per share) $ 6.44 $ 6.44 $ 6.12 $ 6.12
4.800% Additional Tier 1 Capital Notes (AT1 Notes) [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year $ 658      
Balance at end of year 658   $ 658  
4.300% LRCNs, Series 1 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 1,250      
Balance at end of year 1,250   1,250  
5.625% LRCNs, Series 2 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 750      
Balance at end of year 750   750  
7.325% LRCNs, Series 3 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 1,000      
Balance at end of year 1,000   1,000  
7.700% LRCNs, Series 4 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 1,356      
Balance at end of year 1,356   1,356  
7.300% LRCNs, Series 5 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of year 1,023      
Balance at end of year 1,023   $ 1,023  
6.875% LRCNs, Series 6 [member] | Other Equity Instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at end of year $ 1,369