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Investment Securities - Disclosure of Carrying Value of Banks Investment Securities Per Measurement Category (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure of financial assets [line items] |  |
Investment securities | $ 149,948 | $ 152,832
Debt Investments [member] | Financial assets measured at fair value through other comprehensive income, category [member] |  |
Disclosure of financial assets [line items] |  |
Investment securities | 123,732 | 118,226
Debt Investments [member] | Financial assets at amortised cost, category [member] |  |
Disclosure of financial assets [line items] |  |
Investment securities | 23,722 | 29,412
Debt Investments [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Investment securities | 23 | 28
Equity securities [member] | Investments in equity instruments designated at fair value through other comprehensive income [member] |  |
Disclosure of financial assets [line items] |  |
Investment securities | 398 | 3,162
Equity securities [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Investment securities | $ 2,073 | $ 2,004

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