cm:Concept: us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiability
| Loss Contingency, Discounted Amount of Insurance-related Assessment Liability |
| us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiability |
| The present value of the liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiability |