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Employee Benefits - Summary of Excess (deficit) of Fair Value of Assets Over Benefit Obligation for wholly Unfunded Plans and Wholly or Partly Funded Plans (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Pension plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Excess (deficit) of fair value of assets over total benefit obligation | $ 724 | $ 369
Effect of asset limitation and minimum funding requirement | (223) | (208)
Net asset (liability) at end of year | 501 | 161
Pension plans [member] | Unfunded plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Benefit obligation | 346 | 362
Pension plans [member] | Wholly Funded and Partly Funded Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Benefit obligation | 8,886 | 8,529
Fair value of assets | 9,956 | 9,260
Excess (deficit) of fair value of assets over total benefit obligation | 1,070 | 731
Other benefit plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Excess (deficit) of fair value of assets over total benefit obligation | (1,091) | (1,063)
Net asset (liability) at end of year | (1,091) | (1,063)
Other benefit plans [member] | Unfunded plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Benefit obligation | 890 | 930
Other benefit plans [member] | Wholly Funded and Partly Funded Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Benefit obligation | 264 | 217
Fair value of assets | 63 | 84
Excess (deficit) of fair value of assets over total benefit obligation | $ (201) | $ (133)

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + 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 fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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