cm:Concept: us-gaap:DescriptionOfNatureOfDifferencesBetweenMeasurementsOfReportableSegmentsAssetsAndEntitysAssets
| Segment Reporting, Measurement Differences Between Segment and Consolidated Assets |
| us-gaap:DescriptionOfNatureOfDifferencesBetweenMeasurementsOfReportableSegmentsAssetsAndEntitysAssets |
| A description of the nature of any differences between the measurements of reportable segments' assets and the entity's consolidated assets (if not apparent from provided reconciliations). Those differences could include accounting policies and policies for allocation of jointly used assets that are necessary for an understanding of the reported segment information. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DescriptionOfNatureOfDifferencesBetweenMeasurementsOfReportableSegmentsAssetsAndEntitysAssets |