| Standard label: | Gain (Loss) Recognized on Assets Transferred to Separate Account |
| Name: | us-gaap:GainLossRecognizedOnAssetsTransferredToSeparateAccount |
| Documentation: | Amount of net gains or losses recognized during the reporting period on assets that were transferred into separate accounts. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GainLossRecognizedOnAssetsTransferredToSeparateAccount |
| Label | Role | Language |
| Gain (Loss) Recognized on Assets Transferred to Separate Account | http://www.xbrl.org/2003/role/label | en-US |
| Gain (Loss) Recognized on Assets Transferred to Separate Account, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 80 50 1 (f) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |