| Standard label: | OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments, after Tax |
| Name: | us-gaap:OciMarketRiskBenefitInstrumentSpecificCreditRiskGainLossBeforeAdjustmentsAfterTax |
| Documentation: | Amount, after tax and before adjustments, of unrealized gain (loss) from (increase) decrease in instrument-specific credit risk on 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: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OciMarketRiskBenefitInstrumentSpecificCreditRiskGainLossBeforeAdjustmentsAfterTax |
| Label | Role | Language |
| OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments, after Tax | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 10A (n) | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 220 10 45 11 | http://www.xbrl.org/2003/role/disclosureRef | 220 |