| Standard label: | Policyholder Account Balance, Net Amount at Risk |
| Name: | us-gaap:PolicyholderAccountBalanceNetAmountAtRisk |
| Documentation: | Amount of guaranteed benefit in excess of current account balance of policyholder account balance. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PolicyholderAccountBalanceNetAmountAtRisk |
| Label | Role | Language |
| Policyholder Account Balance, Net Amount at Risk | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 7A (b)(2) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 40 55 29F | http://www.xbrl.org/2003/role/exampleRef | 944 |