cm:Concept: us-gaap:ClosedBlockDescription
| Closed Block, Description |
| us-gaap:ClosedBlockDescription |
| A general description of the insurance entity's segregated group of participating or dividend-paying policies and contracts along with the assets allocated to them (known as a closed block) established as a way to protect the interests of preexisting policyholders from the competing interests of the stockholders. The description might include the purpose of the closed block, the types of insurance policies included in the closed block, the nature of cash flows that increase and decrease the assets and liabilities of the closed block, an indication of the insurance entity's continuing responsibility to support the payment of contractual benefits, and the nature of expenses charged to the closed block. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ClosedBlockDescription |