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IFRS 7 - Disclosure - Market Risk - Additional Information (Detail) | 6 Months Ended
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Apr. 30, 2025
Market risk [member] | Value at Risk [member] |
Disclosure of Risk Management [line items] |
Statistical technique percentage of confidence level to measure potential overnight loss | 99.00%

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- Definition Line items represent concepts included in a table. These are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | cm_DisclosureOfRiskManagementLineItems
Namespace Prefix: | cm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Statistical Technique Percentage of Confidence Level to Measure Potential Overnight Loss + References No definition available. + Details
Name: | cm_StatisticalTechniquePercentageOfConfidenceLevelToMeasurePotentialOvernightLoss
Namespace Prefix: | cm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_MeasurementAxis=cm_ValueAtRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |