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
	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

X

- 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_DisclosureOfDefinedBenefitPlansLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

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