cm:Member: us-gaap:VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
| Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] |
| us-gaap:VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |
| Aggregated disclosures of similar Variable Interest Entities (VIE) which are not included in the consolidated financial statements of the entity because the entity does not have a controlling financial interest (not the primary beneficiary). Such disclosures may include how similar entities are aggregated, if separate reporting would not provide more useful information. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |