cm:Table: us-gaap:ReconciliationOfRevenueFromSegmentsToConsolidatedTable
| Reconciliation of Revenue from Segments to Consolidated [Table] |
| us-gaap:ReconciliationOfRevenueFromSegmentsToConsolidatedTable |
| Identification, description, and amounts of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ReconciliationOfRevenueFromSegmentsToConsolidatedTable |