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Insurance (Summary of Insurance Service Result) (Details) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Amounts Arising From Insurance Contracts [Line Items]    
Insurance revenue $ 7,737 $ 6,952
Insurance service expenses 6,089 6,647
Insurance service result before reinsurance contracts held 1,648 305
Net income (expense) from reinsurance contracts held (172) 524
Insurance service result $ 1,476 $ 829