cm:Table: us-gaap:ScheduleOfSubsidiaryOrEquityMethodInvesteeTable
| Schedule of Subsidiary or Equity Method Investee [Table] |
| us-gaap:ScheduleOfSubsidiaryOrEquityMethodInvesteeTable |
| Schedule of subsidiary's sales of previously unissued stock made to investors outside the consolidated group. This includes stock issued in a business combination in exchange for shares of an acquired entity. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ScheduleOfSubsidiaryOrEquityMethodInvesteeTable |