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Commitments, Guarantees and Pledged Assets - Additional Information (Detail) - CAD ($) | Oct. 31, 2025 | Oct. 31, 2024
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Underwriting commitments [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Underwriting commitments | $ 1,045,000,000 | $ 464,000,000
Securities lending [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Securities lending transactions with third parties | 95,000,000,000 | 70,000,000,000
Private equity funds 1 [member] | Top of range [member] | Investment commitments [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
Commitments | 553,000,000 | 528,000,000
Credit risk [member] | Securities lending [member] | Joint ventures [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
credit related commitments | 9,000,000,000 | 7,600,000,000
Credit risk [member] | Securities lending [member] | Joint ventures [member] | Bank of new york mellon [member] |  |
Disclosure of commitments and contingencies [Line Items] |  |
credit related commitments | $ 104,400,000,000 | $ 77,600,000,000

X
- Definition Credit related commitments. + References No definition available. + Details
Name: | cm_CreditRelatedCommitments
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disclosure of commitments and contingencies [Line Items] + References No definition available. + Details
Name: | cm_DisclosureOfCommitmentsAndContingenciesLineItems
Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indemnities to customer of joint ventures. + References No definition available. + Details
Name: | cm_IndemnitiesToCustomerOfJointVentures
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment commitments. + References No definition available. + Details
Name: | cm_InvestmentCommitments
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Underwriting commitments 1 + References No definition available. + Details
Name: | cm_UnderwritingCommitments1
Namespace Prefix: | cm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | cm_TypeOfOtherContractualObligationsAxis=cm_UnderwritingCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis=ifrs-full_SecuritiesLendingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=cm_PrivateEquityFunds1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cm_TypeOfOtherContractualObligationsAxis=cm_InvestmentCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointVenturesAxis=ifrs-full_JointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cm_BankOfNewYorkMellonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |