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Post-Employment Benefits - Summary of Financial Position Related to Defined Benefit Pensions and Other Post Employment Plans (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of net defined benefit liability (asset) [line items] |  |
Net actuarial gains (losses) on plan assets | $ 847 | $ 1,538
Pension plan [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit asset (liability) | 1,715 | 1,384
Valuation allowance | (74) | (47)
Net defined benefit asset (liability), net of valuation allowance | 1,641 | 1,337
Pension plan [member] | Present value of defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Balance at beginning of year | 7,942 | 7,060
Current service cost | 227 | 190
Interest cost on defined benefit obligation | 386 | 396
Employee contributions | 3 | 4
Benefits paid | (382) | (365)
Settlement Payments |  | (79)
Foreign exchange rate changes and other | 4 | 5
Net actuarial (gains) losses on defined benefit obligation | 80 | 731
Balance at end of year | 8,260 | 7,942
Pension plan [member] | Plan assets [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Balance at beginning of year | 9,326 | 8,091
Interest income on plan assets | 462 | 459
Net actuarial gains (losses) on plan assets | 385 | 1,079
Employer contributions | 181 | 146
Employee contributions | 3 | 4
Benefits paid | (382) | (365)
Settlement Payments |  | (79)
Plan administration costs | (7) | (8)
Increase/(decrease) due to plan settlements |  | (10)
Foreign exchange rate changes and other | 7 | 9
Balance at end of year | 9,975 | 9,326
Other post employment benefit plans [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit asset (liability) | (420) | (419)
Net defined benefit asset (liability), net of valuation allowance | (420) | (419)
Other post employment benefit plans [member] | Present value of defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Balance at beginning of year | 419 | 422
Current service cost | 5 | 5
Interest cost on defined benefit obligation | 20 | 24
Benefits paid | (30) | (32)
Net actuarial (gains) losses on defined benefit obligation | 6 |
Balance at end of year | 420 | 419
Other post employment benefit plans [member] | Plan assets [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Employer contributions | 30 | 32
Benefits paid | $ (30) | $ (32)

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- Definition Actuarial gains (losses) arising from changes in demographic, financial and experience assumptions, net defined benefit liability (asset) + References No definition available. + Details
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- Definition Gains losses arising from settlement payment net defined benefit liability asset. + References No definition available. + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + 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 The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [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 e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141&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 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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- 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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