| Standard label: | Separate Account, Short-term Investment [Member] |
| Name: | us-gaap:SeparateAccountShortTermInvestmentMember |
| Documentation: | Investment held with maturity or intent to sell or dispose of within one year or normal operating cycle, if longer, 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:SeparateAccountShortTermInvestmentMember |
| Label | Role | Language |
| Separate Account, Short-term Investment [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 |