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Related-Party Transactions - Additional Information (Detail) - CAD ($) | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of transactions between related parties [line items] |  |
Description of related party transactions | In the ordinary course of business, we provide banking services and enter into transactions with related parties on terms similar to those offered to unrelated parties. Related parties include key management personnel(1), their close family members, and entities that they or their close family members control or jointly control. |
Related parties include close family members control or jointly control | $ 26,000,000 | $ 35,000,000
Letters of credit and guarantees | 0 | 0
Undrawn credit commitments | 15,000,000 | 30,000,000
Provision for credit losses outstanding balances | 0 | 0
Secured Borrowing [member] |  |
Disclosure of transactions between related parties [line items] |  |
Related parties include close family members control or jointly control | 23,000,000 | 33,000,000
Unsecured Borrowing [member] |  |
Disclosure of transactions between related parties [line items] |  |
Related parties include close family members control or jointly control | $ 3,000,000 | $ 2,000,000

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- Definition The amount of related-party commitments made by the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_i&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The description of related party transactions. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 18 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_18&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 amount of expense recognised during the period in respect of bad or doubtful debts due from related parties. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 18 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_18_d&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_h&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | na
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- Definition The amount of transfers under finance agreements from the entity in related party transactions, including loans and equity contributions in cash or in kind. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_g&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |