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Basis of Presentation - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Nov. 01, 2022
Basis of presentation [line items]        
Contractual service margin $ 1,210 $ 1,370   $ 1,550
Other assets 42,884 42,387    
Liabilities 1,388,702 1,325,361    
Assets $ 1,476,802 $ 1,409,647    
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | Indian Accounting Standard Forty [Member]        
Basis of presentation [line items]        
Other assets       132
Stockholders equity after tax       $ 132
Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application [member] | IFRS 9 [member]        
Basis of presentation [line items]        
Liabilities     $ 52,500  
Assets     $ 52,500  
Bottom of range [member]        
Basis of presentation [line items]        
Proportion of voting rights held in associate 20.00%      
Top of range [member]        
Basis of presentation [line items]        
Proportion of voting rights held in associate 50.00%      
Useful lives of Intangible assets other than goodwill 15 years