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IFRS 7 - Disclosure - Liquidity Risk - Summary of Credit Related Commitments (Parenthetical) (Detail) - CAD ($) $ in Billions	Apr. 30, 2025	Oct. 31, 2024
Personal, home equity, and credit card lines [member]
Disclosure of commitments [line items]
Capital commitment	$ 195.7	$ 189.6

X

- Definition

Line items abstract of disclosure of commitments.

+ References

No definition available.

+ Details

Name:	cm_DisclosureOfCommitmentsLineItems
Namespace Prefix:	cm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CapitalCommitments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	cm_TypeOfCommitmentAxis=cm_PersonalHomeEquityAndCreditCardLinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: