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Post-Employment Benefits - Summary of Defined Benefit Plan Expense (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] |  |  |  |  |
Current service cost | $ 56 | $ 57 | $ 47 | $ 170 | $ 142
Net interest (income) expense | (17) | (20) | (16) | (57) | (47)
Interest expense on effect of asset ceiling |  | 1 | 1 | 2 | 1
Plan administration costs | 1 | 2 | 2 | 5 | 6
Net defined benefit plan expense recognized in net income | 40 | 40 | 34 | 120 | 102
Other post employment benefit plans [member] |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Current service cost | 2 | 1 | 1 | 4 | 3
Net interest (income) expense | 5 | 5 | 6 | 15 | 18
Net defined benefit plan expense recognized in net income | $ 7 | $ 6 | $ 7 | $ 19 | $ 21

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- Definition Interest expense on asset ceiling. + References No definition available. + Details
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- Definition Net defined benefit plan expense recognized in net income. + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [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 a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + Details
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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 increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; 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 b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [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 g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_g&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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