XML 239 R176.htm IDEA: XBRL DOCUMENT
v3.25.3

Post-Employment Benefits - Summary of Weighted Average Duration of Defined Benefit Obligation (Detail) - Canada plan [member] | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Pension plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Weighted-average duration, in years | 12 years 8 months 12 days | 12 years 10 months 24 days
Other post employment benefit plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Weighted-average duration, in years | 10 years 2 months 12 days | 10 years 3 months 18 days

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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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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_WeightedAverageDurationOfDefinedBenefitObligation2019
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cm_DefinedBenefitPlansByNameAxis=cm_PensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | cm_DefinedBenefitPlansByNameAxis=cm_OtherPostEmploymentBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |