cm:Table: us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable
| Revenue from External Customers by Products and Services [Table] |
| us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable |
| Tabular presentation of the description and amount of revenues from a product or service, or a group of similar products or similar services, reported from external customers during the period, if the information is not provided as part of the reportable operating segment information. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable |