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IFRS 7 - Disclosure - Market Risk - Additional Information (Detail)	6 Months Ended
	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

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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

X

- Details

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

X

- Details

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