| Standard label: | Separate Account, Mortgage Backed Security [Member] |
| Name: | us-gaap:SeparateAccountMortgageBackedSecurityMember |
| Documentation: | Security collateralized by real estate mortgage loan, in which separate account asset is invested. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:SeparateAccountMortgageBackedSecurityMember |
| Label | Role | Language |
| Separate Account, Mortgage Backed Security [Member] | 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/2009/role/commonPracticeRef | 944 |