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Goodwill and Intangible Assets - Summary of Continuity of Goodwill By Group of CGUs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Goodwill [Line Items]    
Beginning balance $ 16,774 $ 16,728
Write-downs (102)  
Foreign exchange and other 125 46
Ending balance 16,797 16,774
Wealth management [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 260 260
Ending balance 260 260
Capital markets [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 529 528
Foreign exchange and other 3 1
Ending balance 532 529
Wealth and Asset Management [member] | Wealth management [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 258 258
Ending balance 258 258
Insurance products [member] | Wealth management [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 2 2
Ending balance 2 2
Canada [member] | Personal and Commercial Banking [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 330 330
Ending balance 330 330
United States [member] | U.S. Banking [member]    
Disclosure Of Goodwill [Line Items]    
Beginning balance 15,655 15,610
Write-downs (102)  
Foreign exchange and other 122 45
Ending balance $ 15,675 $ 15,655