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Operating Segments - Schedule of Operating Segments (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Other smaller operating segments and corporate adjustments [member] |  |
Disclosure of operating segments [line items] |  |
Tax-exempt income |  | $ 55
Net income from investments in associated corporations | $ 436 | 77
Canadian banking [member] |  |
Disclosure of operating segments [line items] |  |
Net income from investments in associated corporations | 19 | (9)
International banking [member] |  |
Disclosure of operating segments [line items] |  |
Net income from investments in associated corporations | 152 | $ 130
Global banking and markets [member] |  |
Disclosure of operating segments [line items] |  |
Net income from investments in associated corporations | $ 1 |

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