| Standard label: | OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax |
| Name: | us-gaap:OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax |
| Documentation: | Amount, after tax and reclassification adjustment, of unrealized gain (loss) from (increase) decrease in liability for future policy benefit from change in discount rate. |
| 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:OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax |
| Label | Role | Language |
| OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax | http://www.xbrl.org/2003/role/label | en-US |
| OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 10A (m) | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 220 10 45 11 | http://www.xbrl.org/2003/role/disclosureRef | 220 |