| Standard label: | Additional Liability, Long-Duration Insurance, Period Increase (Decrease) |
| Name: | us-gaap:AdditionalLiabilityLongDurationInsurancePeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) in present value of total expected payment to policyholder in excess of present value of total expected assessment. Excludes benefit classified as market risk benefit or under provisions of Topic 815 on derivative and hedging. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AdditionalLiabilityLongDurationInsurancePeriodIncreaseDecrease |
| Label | Role | Language |
| Additional Liability, Long-Duration Insurance, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Additional Liability, Long-Duration Insurance, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 6 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |