cm:Concept: us-gaap:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterYearFive
| Life Settlement Contracts, Fair Value Method, Number of Contracts, Maturing after Year Five |
| us-gaap:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterYearFive |
| Number of life settlement contracts accounted for under the fair value method maturing after the fifth fiscal year following the latest fiscal year. Excludes 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:LifeSettlementContractsFairValueMethodNumberOfContractsMaturingAfterYearFive |