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Post-Employment Benefits - Summary of Net Remeasurement Gains (Losses) Recognized in OCI (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2025 | Apr. 30, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Pension plan [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Net actuarial gains (losses) on defined benefit obligations | $ 68 | $ 260 | $ (294) | $ 162 | $ (726)
Net actuarial gains (losses) on plan assets | 3 | (334) | 549 | (132) | 913
Changes in asset ceiling excluding interest income |  |  | (2) | 1 | (2)
Net remeasurement gains (losses) recognized in OCI | 71 | (74) | 253 | 31 | 185
Other post employment benefit plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Net actuarial gains (losses) on defined benefit obligations | 4 | 8 | (15) | 5 | (38)
Net remeasurement gains (losses) recognized in OCI | $ 4 | $ 8 | $ (15) | $ 5 | $ (38)

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- Definition Net actuarial gain (loss) on defined benefit obligation. + References No definition available. + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2024-03-27 + Details
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