| Standard label: | Financial Guarantee Insurance Contracts, Claim Liability, Weighted Average Risk Free Discount Rate |
| Name: | us-gaap:FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate |
| Documentation: | This element represents the weighted average risk free rate used to discount the claim liability related to financial guarantee insurance contracts. |
| 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:FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate |
| Label | Role | Language |
| Financial Guarantee Insurance Contracts, Claim Liability, Weighted Average Risk Free Discount Rate | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 9 (a)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |