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Structured Entities and Derecognition of Financial Assets - Schedule of Carrying Amount and Fair Value of Transferred Financial Assets that did not Qualify for Derecognition and Associated Financial Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Canada mortgage and housing corporation [member] | Mortgage backed securities [member] |  |
Disclosure of transferred financial assets that are not derecognised in their entirety [line items] |  |
Certain cash in transit balances related to securitization process | $ 470 | $ 410

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- Definition Certain cash in transit balances relate to securitization process. + References No definition available. + Details
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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_DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CounterpartiesAxis=cm_CanadaMortgageAndHousingCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_FinancialAssetsWhichDoNotQualifyForDerecognitionAxis=cm_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |