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Corporate Income Taxes - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($) | Oct. 31, 2025 EUR (€)
Disclosure Of Income Taxes [Line Items] |  |  |
Temporary differences, unused tax losses and unused tax credits for which no deferred tax asset is recognized | $ 10 | $ 18 |
Unrecognized losses | 10 |  |
Deferred tax asset tax benefits relate to tax losses incurred in Canadian or foreign operations | 56 | 73 |
Amount of taxable temporary differences associated with investments in subsidiaries, associates and interests in joint ventures for which deferred tax liabilities have not been recognized | $ 59,000 | $ 57,000 |
Average effective tax rate | 26.20% | 20.50% |
Threshold limit of revenue payment of global minimum tax | € |  |  | € 750
Global minimum tax rate | 15.00% |  |
2014 to 2018 taxation year [member] | Subsidiaries [member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Subsidiary amount for tax assessment notice served | $ 637 |  |
2011 to 2020 taxation year [member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Reassessed tax by Canada Revenue Agency | 1,808 |  |
2018 to 2020 taxation year [member] | Subsidiaries [member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Subsidiary amount for tax assessment notice served | $ 4 |  |
Top of range [member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Average effective tax rate | 0.80% |  |

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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Total for all associates [member]; Total for all subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_f&doctype=Standard -URIDate 2024-03-27 + Details
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