| Standard label: | Financial Guarantee Insurance Contracts, Risk Management Activities, Mitigating Claim Liabilities, Accrued Liabilities |
| Name: | us-gaap:FinancialGuaranteeInsuranceContractsRiskManagementActivitiesMitigatingClaimLiabilitiesAccruedLiabilities |
| Documentation: | The amount of expense accrued as of the reporting date related to risk management activities (not including reinsurance) for the mitigating of claim liabilities related to financial guarantee insurance contracts. |
| 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:FinancialGuaranteeInsuranceContractsRiskManagementActivitiesMitigatingClaimLiabilitiesAccruedLiabilities |
| Label | Role | Language |
| Financial Guarantee Insurance Contracts, Risk Management Activities, Mitigating Claim Liabilities, Accrued Liabilities | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 9 (b)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |