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Employee Compensation - Pension and Other Employee Future Benefits - Summary of Changes in Estimated Financial Positions of Defined Benefit Pension Plans and Other Employee Future Benefit Plans (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of defined benefit plans [line items] |  |  |
Fair value of plan assets at beginning of year |  | $ 9,156 |
Actuarial (gains) losses due to: |  |  |
Fair value of plan assets at end of year |  | 9,456 | $ 9,156
Pension Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation at beginning of year |  | 8,365 |
Fair value of plan assets at beginning of year |  | 9,431 |
Current service cost |  | 177 | 153
Actuarial (gains) losses due to: |  |  |
Changes in demographic assumptions |  | (6) |
Changes in financial assumptions |  | (45) | (851)
Plan member experience |  | (71) | (31)
Foreign exchange and other |  | (1) | (3)
Defined benefit obligation at end of year |  | 8,582 | 8,365
Fair value of plan assets at end of year |  | 9,708 | 9,431
Net surplus (deficit), net of the effect of the asset ceiling |  | 1,126 | 1,063
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 126 | 91
Pension Plans [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation at beginning of year |  | 8,365 | 7,513
Transfer of defined benefit obligation |  | 3 |
Settlements | [1] |  | (147)
Current service cost |  | 177 | 153
Interest cost |  | 399 | 418
Impact of plan amendments |  | (19) |
Employer contributions |  | 21 | 20
Benefits paid |  | (500) | (481)
Actuarial (gains) losses due to: |  |  |
Changes in demographic assumptions |  | 6 |
Changes in financial assumptions |  | 45 | 851
Plan member experience |  | 71 | 31
Foreign exchange and other |  | 14 | 7
Defined benefit obligation at end of year |  | 8,582 | 8,365
Wholly or partially funded defined benefit obligation |  | 8,437 | 8,205
Unfunded defined benefit obligation |  | 145 | 160
Pension Plans [member] | Plan assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Fair value of plan assets at beginning of year |  | 9,431 | 8,559
Interest income |  | 450 | 479
Settlements | [1] |  | (147)
Return on plan assets (excluding interest income) |  | 246 | 979
Employer contributions |  | 55 | 25
Employee contributions |  | 21 | 20
Benefits paid |  | (500) | (481)
Actuarial (gains) losses due to: |  |  |
Administrative expenses |  | (8) | (12)
Foreign exchange and other |  | 13 | 9
Fair value of plan assets at end of year |  | 9,708 | 9,431
Net surplus (deficit), net of the effect of the asset ceiling |  | 1,126 | 1,063
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 246 | 979
Pension Plans [member] | Effect of asset ceiling [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | 0 | (3)
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 3 | (3)
Pension Plans [member] | Other assets [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | 1,316 | 1,252
Pension Plans [member] | Other liabilities [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | (190) | (189)
Other employee future benefit plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation at beginning of year |  | 954 |
Fair value of plan assets at beginning of year |  | 245 |
Current service cost |  | 6 | 5
Actuarial (gains) losses due to: |  |  |
Changes in demographic assumptions |  | 22 | 15
Changes in financial assumptions |  | 3 | (74)
Plan member experience |  | (5) | 6
Defined benefit obligation at end of year |  | 950 | 954
Fair value of plan assets at end of year |  | 248 | 245
Net surplus (deficit), net of the effect of the asset ceiling |  | (776) | (819)
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 64 | (159)
Other employee future benefit plans [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation at beginning of year |  | 954 | 880
Transfer of defined benefit obligation |  | (3) |
Current service cost |  | 6 | 5
Interest cost |  | 45 | 49
Impact of plan amendments |  |  | 15
Employer contributions |  | 6 | 6
Benefits paid |  | (62) | (59)
Actuarial (gains) losses due to: |  |  |
Changes in demographic assumptions |  | (22) | (12)
Changes in financial assumptions |  | (2) | 81
Plan member experience |  | 27 | (11)
Foreign exchange and other |  | 1 |
Defined benefit obligation at end of year |  | 950 | 954
Wholly or partially funded defined benefit obligation |  | 87 | 91
Unfunded defined benefit obligation |  | 863 | 863
Other employee future benefit plans [member] | Plan assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Fair value of plan assets at beginning of year |  | 245 | 138
Interest income |  | 13 | 12
Impact of plan amendments |  |  | 100
Return on plan assets (excluding interest income) |  | 1 | 1
Employer contributions |  | 43 | 45
Employee contributions |  | 6 | 6
Benefits paid |  | (62) | (59)
Actuarial (gains) losses due to: |  |  |
Foreign exchange and other |  | 2 | 2
Fair value of plan assets at end of year |  | 248 | 245
Net surplus (deficit), net of the effect of the asset ceiling |  | (776) | (819)
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 1 | 1
Other employee future benefit plans [member] | Effect of asset ceiling [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | (74) | (110)
Actuarial gains (losses) recognized in other comprehensive income for the year |  | 43 | (107)
Other employee future benefit plans [member] | Other assets [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | 87 | 44
Other employee future benefit plans [member] | Other liabilities [member] |  |  |
Actuarial (gains) losses due to: |  |  |
Net surplus (deficit), net of the effect of the asset ceiling |  | $ (863) | $ (863)
[1] | We completed a buyout of our UK pension plan in the fourth quarter of 2024, whereby we transferred our defined benefit obligations and an equal amount of plan assets to a third-party insurer, who has assumed responsibility for administering payments to plan members. We do not have any further involvement in the plan. There was no pre-tax impact from this transfer. Deferred tax assets and liabilities related to the pension plan were reduced to $nil.

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [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 -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [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 -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [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 -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 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 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 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 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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