| Standard label: | Property, Liability and Casualty Insurance Product Line [Member] |
| Name: | us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember |
| Documentation: | Contract providing insurance coverage against property-related loss. Includes, but is not limited to, damage, theft, or legal liability for personal injury. |
| 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:PropertyLiabilityAndCasualtyInsuranceSegmentMember |
| Label | Role | Language |
| Property, Liability and Casualty Insurance Product Line [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 235 S99 2 | http://www.xbrl.org/2003/role/disclosureRef | 944 |
| FASB Accounting Standards Codification 944 40 55 9C (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |