| Standard label: | Loss Contingency, Discounted Amount of Insurance-related Assessment Liability, Realization Period for Associated Asset Offsets |
| Name: | us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiabilityRealizationPeriodForAssociatedAssetOffsets |
| Documentation: | The period of time over which the assets related to premium tax offsets and policy surcharges are expected to be realized. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiabilityRealizationPeriodForAssociatedAssetOffsets |
| Label | Role | Language |
| Loss Contingency, Discounted Amount of Insurance-related Assessment Liability, Realization Period for Associated Asset Offsets | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 405 30 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 405 |