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Investments in Associates - Additional Information (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Disclosure of associates [line items]
Terminal growth rate	4.50%	4.50%
Cash flows discounted rate	10.00%	10.00%
Bank of Xian Co Ltd [member]
Disclosure of associates [line items]
Impairment loss recognized in profit or loss	$ 0	$ 343
Term of cash flow forecast	5 years
Terminal growth rate	2.00%	2.00%
Cash flows discounted rate	11.00%	12.00%
Impairment loss after tax		$ 309

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The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
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The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

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The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

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