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Income Taxes - Summary of Components of Deferred Income Tax Balances (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset $ 3,023 $ 3,404  
Benefit (expense) to Income statement (12) (153)  
Benefit (expense) to equity (312) (295)  
Translation and other 32 67  
Ending balance of net asset 2,731 3,023  
Comprising      
Deferred tax assets 2,732 3,024 $ 3,420
Deferred tax liabilities (1) (1) (16)
Net deferred tax assets (liabilities) 2,731 3,023 $ 3,404
Allowance for credit losses [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 1,343 893  
Benefit (expense) to Income statement (56) 449  
Benefit (expense) to equity 0    
Translation and other 5 1  
Ending balance of net asset 1,292 1,343  
Employee future benefits [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 282 264  
Benefit (expense) to Income statement 23 3  
Benefit (expense) to equity (6) 15  
Translation and other 0    
Ending balance of net asset 299 282  
Deferred compensation benefits [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 749 783  
Benefit (expense) to Income statement 308 (35)  
Benefit (expense) to equity 0    
Translation and other 2 1  
Ending balance of net asset 1,059 749  
Other comprehensive income [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 224 522  
Benefit (expense) to Income statement 0    
Benefit (expense) to equity (261) (298)  
Translation and other 0    
Ending balance of net asset (37) 224  
Premises and equipment [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset (480) (343)  
Benefit (expense) to Income statement (19) (136)  
Benefit (expense) to equity 0    
Translation and other 1 (1)  
Ending balance of net asset (498) (480)  
Pension benefits [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset (338) (395)  
Benefit (expense) to Income statement 13 73  
Benefit (expense) to equity (47) (16)  
Translation and other 2    
Ending balance of net asset (370) (338)  
Goodwill and intangible assets [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset (805) (913)  
Benefit (expense) to Income statement 36 107  
Benefit (expense) to equity 0    
Translation and other (6) 1  
Ending balance of net asset (775) (805)  
Securities [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 867 987  
Benefit (expense) to Income statement (294) (119)  
Benefit (expense) to equity 0    
Translation and other 5 (1)  
Ending balance of net asset 578 867  
Deferred Tax Asset Liability Other [member]      
Disclosure of components of deferred tax assets and liabilities [line items]      
Beginning balance of net asset 1,181 1,606  
Benefit (expense) to Income statement (23) (495)  
Benefit (expense) to equity 2 4  
Translation and other 23 66  
Ending balance of net asset $ 1,183 $ 1,181