cm:Member: us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorizationDomain
| Investments in and Advances to Affiliates Categorization [Domain] |
| us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorizationDomain |
| Used to categorize investments in and advances of affiliate. Lists the categories for (1) Investments in majority owned subsidiaries, segregating subsidiaries consolidated; (2) other controlled companies; and (3) other affiliates. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorizationDomain |