| Standard label: | Policyholder Account Balance, Period Increase (Decrease) |
| Name: | us-gaap:PolicyholderAccountBalancePeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) in liability for policyholder account balance. |
| 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:PolicyholderAccountBalancePeriodIncreaseDecrease |
| Label | Role | Language |
| Policyholder Account Balance, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Policyholder Account Balance, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 7A (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |