cm:Level3TextBlock: us-gaap:ScheduleOfLifeSettlementContractsInvestmentMethodTextBlock
| Schedule of Life Settlement Contracts, Investment Method [Table Text Block] |
| us-gaap:ScheduleOfLifeSettlementContractsInvestmentMethodTextBlock |
| Tabular disclosure of life settlement contracts based on the remaining life expectancy for each of the first five succeeding years from the date of the statement of financial position and thereafter, as well as in the aggregate including: (a) the number of life settlement contracts, (b) the carrying value of the life settlement contracts, and (c) the face value (death benefits) of the life insurance policies underlying the contracts, and (d) the life insurance premiums anticipated to be paid for each of the five succeeding fiscal years to keep the life settlement contracts in force as of the date of the most recent statement of financial position presented. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfLifeSettlementContractsInvestmentMethodTextBlock |
| LifeSettlementContractsInvestmentMethod |