IFRS 7 - Disclosure - Market Risk - Additional Information (Detail)	3 Months Ended
Jul. 31, 2022
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%

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.

No definition available.

Name:	cm_DisclosureOfRiskManagementLineItems
Namespace Prefix:	cm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration