| Standard label: | AOCI, Liability for Future Policy Benefit, Parent [Member] |
| Name: | us-gaap:AociLiabilityForFuturePolicyBenefitParentMember |
| Documentation: | Accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in liability for future policy benefit from change in discount rate, attributable to parent. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AociLiabilityForFuturePolicyBenefitParentMember |
| Label | Role | Language |
| AOCI, Liability for Future Policy Benefit, Parent [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 14A | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 220 10 45 10A (m) | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 810 10 50 1A (c )(3) | http://www.xbrl.org/2003/role/disclosureRef | 810 |