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Post-Employment Benefits - Summary of Weighted Average Principal Assumptions Used to Determine Defined Benefit Obligation (Parenthetical) (Detail) | Oct. 31, 2025 | Oct. 31, 2024
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Canada plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Percentage of weighted average salary growth rate | 2.50% | 2.50%

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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cm_DomesticDefinedBenefitPlans1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |