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Operating Segments - Summary of Bank's Financial Results by Geographic Region (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | $ (12) | $ (68)
United States [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | 362 |
Mexico [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | 9 | 11
Peru [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | 4 | 4
Chile [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | 7 | 6
Caribbean And Central America [Member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | 132 | 109
Other International [member] |  |
Disclosure of geographical areas [line items] |  |
Net income from investments in associated corporations | $ 106 | $ 136

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