| Standard label: | Liability for Future Policy Benefit Activity [Table] |
| Name: | us-gaap:LiabilityForFuturePolicyBenefitActivityTable |
| Documentation: | Disclosure of information about activity for liability for future policy benefit. Includes, but is not limited to, beginning and ending balance, issuance, interest income (expense), net premium collected, benefit payment, derecognition, experience adjustment, change in cash flow assumption, and change in discount rate assumption. |
| 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:LiabilityForFuturePolicyBenefitActivityTable |
| Label | Role | Language |
| Liability for Future Policy Benefit Activity [Table] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 55 29E | http://www.xbrl.org/2003/role/exampleRef | 944 |
| FASB Accounting Standards Codification 944 40 50 6 (a) | http://www.xbrl.org/2003/role/disclosureRef | 944 |