| Standard label: | Financial Guarantee Insurance Contracts, Claim Liability, Significant Components of Change, Effect of Change in Discount Rate |
| Name: | us-gaap:FinancialGuaranteeInsuranceContractsClaimLiabilitySignificantComponentsOfChangeEffectOfChangeInDiscountRate |
| Documentation: | This element represents the amount of change in the claim liability related to financial guarantee insurance contracts arising from a change in the rate used to discount the claim liability. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FinancialGuaranteeInsuranceContractsClaimLiabilitySignificantComponentsOfChangeEffectOfChangeInDiscountRate |
| Label | Role | Language |
| Financial Guarantee Insurance Contracts, Claim Liability, Significant Components of Change, Effect of Change in Discount Rate | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 9 (a)(3) | http://www.xbrl.org/2003/role/disclosureRef | 944 |