cm:Concept: us-gaap:LifeSettlementContractsInvestmentMethodFaceValueMaturingInRollingYearThree
| Life Settlement Contracts, Investment Method, Face Value, Maturing in Rolling Year Three |
| us-gaap:LifeSettlementContractsInvestmentMethodFaceValueMaturingInRollingYearThree |
| Face value of the life insurance policies underlying the life settlement contracts accounted for under the investment method maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:LifeSettlementContractsInvestmentMethodFaceValueMaturingInRollingYearThree |