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Related-Party Transactions - Summary of Compensation of Key Management Personnel (Detail) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Directors [member]    
Disclosure of transactions between related parties [line items]    
Short-term benefits $ 2 $ 2
Share-based benefits 2 2
Total compensation 4 4
Senior officers [member]    
Disclosure of transactions between related parties [line items]    
Short-term benefits 20 19
Post-employment benefits 2 2
Share-based benefits 35 32
Termination benefits 1 1
Total compensation $ 58 $ 54