| Standard label: | Short-duration Insurance Contracts, Accident Year 2018 [Member] |
| Name: | us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member |
| Documentation: | Accident year 2018 in which covered event occurs under terms of short-duration insurance contract. |
| 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:ShortDurationInsuranceContractsAccidentYear2018Member |
| Label | Role | Language |
| Short-duration Insurance Contracts, Accident Year 2018 [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 4B | http://www.xbrl.org/2003/role/disclosureRef | 944 |