cm:Level3TextBlock: us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock
| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock |
| Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock |
| SegmentReportingInformationBySegment |