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Related Party Transactions (Summary of Compensation of Key Management Personnel and Directors) (Details) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [abstract]    
Short-term employee benefits $ 52 $ 30
Post-employment benefits 3 1
Share-based payments 54 23
Total $ 109 $ 54