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Securities - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Apr. 30, 2025 | Apr. 30, 2024
Disclosure of financial assets [line items] |  |  |  |  |
Fair value of equity securities designated at FVOCI that were disposed | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Net realized cumulative after-tax gains reclassifed from AOCI to retained earnings | 0 | 0 | 0 | 0 | 1
Dividend income recognized on equity securities | 0 | 2 | 0 | 2 | 1
Dividend income recognized on equity securities designated at FVOCI that were disposed | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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