| Standard label: | OCI, Liability for Future Policy Benefit, Gain (Loss), Reclassification Adjustment from AOCI, Tax |
| Name: | us-gaap:OciLiabilityForFuturePolicyBenefitGainLossReclassificationAdjustmentFromAociTax |
| Documentation: | Amount of tax expense (benefit) for reclassification adjustment from accumulated other comprehensive income (loss) (AOCI) for 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:OciLiabilityForFuturePolicyBenefitGainLossReclassificationAdjustmentFromAociTax |
| Label | Role | Language |
| OCI, Liability for Future Policy Benefit, Gain (Loss), Reclassification Adjustment from AOCI, Tax | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 12 | http://www.xbrl.org/2003/role/disclosureRef | 220 |