| Standard label: | Short-Duration Contracts, Discounted Liabilities, Amount |
| Name: | us-gaap:ShortDurationContractsDiscountedLiabilitiesAmount |
| Documentation: | The carrying amount as of the balance sheet date of loss reserves carried at present value. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ShortDurationContractsDiscountedLiabilitiesAmount |
| Label | Role | Language |
| Short-Duration Contracts, Discounted Liabilities, Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 20 S99 1 (SAB Topic 5.N.Q1) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |
| FASB Accounting Standards Codification 944 40 50 5 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |