| Standard label: | Liability for Future Policy Benefit, Weighted-Average Duration |
| Name: | us-gaap:LiabilityForFuturePolicyBenefitWeightedAverageDuration |
| Documentation: | Weighted-average duration of liability for future policy benefit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. |
| Object type: | cm:Concept |
| Data type: | xbrli:durationItemType |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LiabilityForFuturePolicyBenefitWeightedAverageDuration |
| Label | Role | Language |
| Liability for Future Policy Benefit, Weighted-Average Duration | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 6 (b)(5) | http://www.xbrl.org/2003/role/disclosureRef | 944 |