cm:Concept: us-gaap:RevenuePerformanceObligationDescriptionOfGoodOrService
| Revenue, Performance Obligation, Description of Good or Service |
| us-gaap:RevenuePerformanceObligationDescriptionOfGoodOrService |
| Description of good or service to be transferred in contract with customer. Includes, but is not limited to, arrangement for another party to transfer good or service to customer. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenuePerformanceObligationDescriptionOfGoodOrService |