| Standard label: | Market Risk Benefit, Net Amount at Risk |
| Name: | us-gaap:MarketRiskBenefitNetAmountAtRisk |
| Documentation: | Amount of guaranteed benefit in excess of current account balance of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. |
| 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:MarketRiskBenefitNetAmountAtRisk |
| Label | Role | Language |
| Market Risk Benefit, Net Amount at Risk | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 7B (b) | http://www.xbrl.org/2003/role/disclosureRef | 944 |