| Standard label: | Fair Value, Separate Account Investment [Table] |
| Name: | us-gaap:ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentTable |
| Documentation: | Disclosure of information about fair value of asset supporting separate account. |
| Object type: | cm:Table |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentTable |
| Label | Role | Language |
| Fair Value, Separate Account Investment [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 80 50 1 (e) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| FASB Accounting Standards Codification 944 80 55 17 | http://www.xbrl.org/2003/role/exampleRef | 944 |