| Standard label: | Additional Liability, Long-Duration Insurance, Weighted-Average Duration |
| Name: | us-gaap:AdditionalLiabilityLongDurationInsuranceWeightedAverageDuration |
| Documentation: | Weighted-average duration of present value of total expected payment to policyholder in excess of present value of total expected assessment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. |
| 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:AdditionalLiabilityLongDurationInsuranceWeightedAverageDuration |
| Label | Role | Language |
| Additional Liability, Long-Duration Insurance, 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 |