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Structured Entities and Derecognition of Financial Assets - Schedule of Unconsolidated Entity Balance Sheet Amounts and Maximum Exposure to Loss (Parenthetical) (Detail) - Multi seller conduits [member] - CAD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Disclosure of information about consolidated structured entities [line items]
Commitment to fund purchases of additional assets	$ 8,400	$ 6,200
Direct investments	$ 592	$ 276

X

- Definition

Commitment to fund purchases of additional assets through backstop liquidity facilities provided to multi-seller conduits.

+ References

No definition available.

+ Details

Name:	cm_CommitmentToFundPurchasesOfAdditionalAssets
Namespace Prefix:	cm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Direct investments in multi seller conduits.

+ References

No definition available.

+ Details

Name:	cm_DirectInvestmentsInMultiSellerConduits
Namespace Prefix:	cm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Details

Name:	ifrs-full_UnconsolidatedStructuredEntitiesAxis=cm_MultiSellerConduitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: