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Corporate Income Taxes - Changes to Net Deferred Taxes (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance |  | $ 1,545 | [1] | $ 2,095
Deferred tax benefit (expense) for the year recorded in income | [1] | 549 |  | (438)
Deferred tax benefit (expense) for the year recorded in equity |  | (224) |  | (41)
Disposed in divestitures |  | (35) |  |
Other |  | 4 |  | (71)
Ending balance | [1] | $ 1,839 |  | $ 1,545
[1] | For Consolidated Statement of Financial Position presentation, deferred tax assets and liabilities are assessed by legal entity. As a result, the net deferred tax assets of $1,839 (2024 – $1,545) are represented by deferred tax assets of $3,253 (2024 – $2,942), and deferred tax liabilities of $1,414 (2024 – $1,397) on the Consolidated Statement of Financial Position.

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in deferred tax liability (asset) resulting from the loss of control of a subsidiary. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81&doctype=Standard -URIDate 2024-03-27 + Details
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