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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
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Disclosure of information about consolidated structured entities [line items] |  |
Commitment to fund purchases of additional assets | $ 8,400 | $ 6,200
Direct investments | $ 592 | $ 276

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- 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

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- 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

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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
Name: | ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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