cm:Concept: us-gaap:DescriptionOfRegulatoryCapitalRequirementsUnderInsuranceRegulations
| Description of Regulatory Capital Requirements under Insurance Regulations |
| us-gaap:DescriptionOfRegulatoryCapitalRequirementsUnderInsuranceRegulations |
| For insurance companies, a description of the minimum regulatory capital requirements imposed by state insurance regulators, and restrictions on dividend payments. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DescriptionOfRegulatoryCapitalRequirementsUnderInsuranceRegulations |