cm:Concept: us-gaap:FinancialGuaranteeInsuranceContractsRiskManagementActivitiesPoliciesForPlacementInGrouping
| Financial Guarantee Insurance Contracts, Risk Management Activities, Policies for Placement in Grouping |
| us-gaap:FinancialGuaranteeInsuranceContractsRiskManagementActivitiesPoliciesForPlacementInGrouping |
| This element represents a description of the entity's policies for placing a deteriorating insured financial obligation related to a financial guarantee insurance contract in a particular risk-management tracking group or category and the policies for the on-going monitoring of each grouping or category. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:FinancialGuaranteeInsuranceContractsRiskManagementActivitiesPoliciesForPlacementInGrouping |