cm:Concept: us-gaap:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterRollingYearFive
| Life Settlement Contracts, Fair Value Method, Number of Contracts, Maturing after Rolling Year Five |
| us-gaap:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterRollingYearFive |
| Number of life settlement contracts accounted for under the fair value method maturing after the fifth 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 |
| Integer (xbrli:integerItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterRollingYearFive |