cm:Concept: us-gaap:LifeSettlementContractsInvestmentMethodPremiumsToBePaidInRollingYearFour
| Life Settlement Contracts, Investment Method, Premiums to be Paid in Rolling Year Four |
| us-gaap:LifeSettlementContractsInvestmentMethodPremiumsToBePaidInRollingYearFour |
| Amount of life insurance premiums to keep the life settlement contracts accounted for under the investment method in force anticipated to be paid in the fourth 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:LifeSettlementContractsInvestmentMethodPremiumsToBePaidInRollingYearFour |