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Insurance - Summary of Insurance Investment Results (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Insurance Investment Results [Abstract]    
Investment return $ 1,122 $ 2,320
Insurance finance (expense) from insurance and reinsurance contracts held (955) (2,098)
Movement in investment contract liabilities (43) (117)
Insurance investment results $ 124 $ 105