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Investments in Associates - Summary of Significant Investments in Associates (Parenthetical) (Detail) - CAD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 27, 2024 | Oct. 31, 2025 | Oct. 31, 2024
Disclosure of associates [line items] |  |  |
Undistributed retained earnings |  | $ 76 | $ 74
Investments in associates based on quoted Stock Exchange price on Shanghai |  | 617 | $ 570
KeyCorp [Member] |  |  |
Disclosure of associates [line items] |  |  |
Investments in associates based on quoted new york stock exchange price |  | 4,018 |
Dividends received from associates recognised as reduction of investment |  | $ 140 |
Proportion of ownership interest in associate | 14.90% |  |
Additional Proportion of Investment Acquired in Associates | 10.00% |  |

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