| Standard label: | Loss Contingency Accrual, Insurance-related Assessment, Discount Rate |
| Name: | us-gaap:LossContingencyAccrualInsuranceRelatedAssessmentDiscountRate |
| Documentation: | The rate applied as of the balance sheet date to reduce the undiscounted amount of a guarantee fund and other insurance-related assessments to present value. |
| Object type: | cm:Concept |
| Data type: | Percent (num:percentItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LossContingencyAccrualInsuranceRelatedAssessmentDiscountRate |
| Label | Role | Language |
| Loss Contingency Accrual, Insurance-related Assessment, Discount Rate | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 405 30 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 405 |