| Standard label: | Market Risk Benefit [Table] |
| Name: | us-gaap:MarketRiskBenefitTable |
| Documentation: | Disclosure of information about 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: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:MarketRiskBenefitTable |
| Label | Role | Language |
| Market Risk Benefit [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 7B (a) | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 40 55 29G | http://www.xbrl.org/2003/role/exampleRef | 944 |