cm:Table: us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationTable
| Schedule of Insured Financial Obligations with Credit Deterioration [Table] |
| us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationTable |
| This element represents the schedule of insured financial obligations with credit deterioration related to the claim liability on financial guarantee insurance contracts as of the end of each annual and interim reporting period detailing, at a minimum, the following for each surveillance category or grouping used to track and monitor the entity's insured financial obligations: (1) number of issued and outstanding financial guarantee insurance contracts; (2) remaining weighted average contract period; (3) insured contractual payments outstanding, segregating principal and interest; (4) gross claim liability; (5) gross potential recoveries; (6) net discount of both the claim liability and potential recoveries; (7) net claim liability; (8) reinsurance recoverable; and (9) unearned premium revenue. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationTable |