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Related Party Transactions (Narrative) (Details)
$ in Millions, $ in Millions
12 Months Ended
Oct. 31, 2025
CAD ($)
Oct. 31, 2024
CAD ($)
Oct. 31, 2025
USD ($)
Oct. 31, 2024
USD ($)
Key management personnel of entity or parent [member]        
Disclosure of transactions between related parties [line items]        
Amount receivable from related party $ 131 $ 14    
Charles Schwab Corporation [Member]        
Disclosure of transactions between related parties [line items]        
Amount receivable from related party 49 12    
Amount payable to related party 38 42    
Symcor [Member]        
Disclosure of transactions between related parties [line items]        
Cash paid to related party 89 88    
Amount payable to related party $ 7 6    
Description of ownership interest in related party one-third ownership      
Unsecured loan facility $ 100 100    
Insured Deposit Account Agreement [member] | Charles Schwab Corporation [Member]        
Disclosure of transactions between related parties [line items]        
Cash paid to related party   908    
Deposits under the Schwab IDA Agreement $ 106,000 $ 117,000 $ 76,000 $ 84