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IFRS 7 - Disclosure - Credit Risk - Summary of Exposure to Credit Risk (Parenthetical) (Detail) | Oct. 31, 2025
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Disclosure of credit risk exposure [line items] |
Weighted average risk rate of credit | 100.00%
Weighted average risk rate of non financial institutions | 1250.00%
Weighted average risk rate of settlement risk below threshold limit | 250.00%

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- Definition Weighted average risk rate of credit. + References No definition available. + Details
Name: | cm_WeightedAverageRiskRateOfCredit
Namespace Prefix: | cm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted average risk rate of non financial institutions. + References No definition available. + Details
Name: | cm_WeightedAverageRiskRateOfNonFinancialInstitutions
Namespace Prefix: | cm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted average risk rate of settlement risk below threshold limit. + References No definition available. + Details
Name: | cm_WeightedAverageRiskRateOfSettlementRiskBelowThresholdLimit
Namespace Prefix: | cm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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_DisclosureOfCreditRiskExposureLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration