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%

Additional Proportion of Investment Acquired in Associates

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Dividends received from associates recognised as reduction of investment.

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Investments in associates based on quoted new york stock exchange price.

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Investments in associates based on quoted stock exchange price.

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Undistributed Retained Earnings in Foreign Associates

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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