| Standard label: | Financial Guarantee Insurance Contracts, Premium Received over Contract Period, Premium Receivable, Weighted Average Risk Free Discount Rate |
| Name: | us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageRiskFreeDiscountRate |
| Documentation: | This element represents the weighted average risk free rate used to discount the premiums expected to be collected for financial guarantee insurance contracts where the premium is to be received over the contract period. |
| Object type: | cm:Concept |
| Data type: | Percent (num:percentItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageRiskFreeDiscountRate |
| Label | Role | Language |
| Financial Guarantee Insurance Contracts, Premium Received over Contract Period, Premium Receivable, Weighted Average Risk Free Discount Rate | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 310 50 3 (a)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |