| Standard label: | Financial Guarantee Insurance Contracts, Premium Receivable |
| Name: | us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivable |
| Documentation: | Amount of the premium receivable for financial guarantee insurance contracts reported in the statement of financial position. This element primarily would consist of those financial guarantee insurance contracts which premiums are to be collected over the contract period, but may, on occasion, include premiums which are to be collected in full at inception, but which straddle a financial reporting period. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivable |
| Label | Role | Language |
| Financial Guarantee Insurance Contracts, Premium Receivable | http://www.xbrl.org/2003/role/label | en-US |
| Financial Guarantee Insurance Contracts, Premium Receivable, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Financial Guarantee Insurance Contracts, Premium Receivable, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 310 50 3 (c)(1),(5) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |