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Post-Employment Benefits - Summary of Defined Benefit Obligation (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Pension plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | $ 8,260 | $ 7,942
Other post employment benefit plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 420 | 419
Canada plan [member] | Pension plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 7,592 | 7,291
Canada plan [member] | Pension plan [member] | Active members [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 3,757 | 3,558
Canada plan [member] | Pension plan [member] | Deferred members [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 510 | 490
Canada plan [member] | Pension plan [member] | Retired members [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 3,325 | 3,243
Canada plan [member] | Other post employment benefit plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 391 | 389
Canada plan [member] | Other post employment benefit plans [member] | Active members [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | 79 | 74
Canada plan [member] | Other post employment benefit plans [member] | Retired members [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation | $ 312 | $ 315

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Details
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Data Type: | na
Balance Type: |
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- Details
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- Details
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- Details
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- Details
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- Details
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