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Financial instruments - disclosures - Schedule of Balance Sheet Exposure Credit Risk under Different Basel Approaches (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |
Bank acceptance assets | $ 10 | $ 6
Subject to credit risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Bank acceptance assets | $ 10 |

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- Definition The amount of bank acceptances recognised as assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BankAcceptanceAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfRisksAxis=cm_SubjectToCreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |