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Post-Employment Benefits - Summary of Defined Benefit Assets (Liability) Net of Valuation Allowance Included in Other Assets and Other Liabilities (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability | $ (457) | $ (460)
Other assets [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit asset | 1,678 | 1,378
Pension plan [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit asset (liability), net of valuation allowance | 1,641 | 1,337
Pension plan [member] | Other assets [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit asset | 1,678 | 1,378
Pension plan [member] | Other Liabilities [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability | (37) | (41)
Other post employment benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit asset (liability), net of valuation allowance | (420) | (419)
Other post employment benefit plans [member] | Other Liabilities [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Defined benefit liability | $ (420) | $ (419)

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- Definition 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. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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