cm:Concept: us-gaap:ClosedBlockTermsOfOperation
| Closed Block Terms of Operation |
| us-gaap:ClosedBlockTermsOfOperation |
| A general outline of the operations of an insurance entity's segregated group of participating or dividend-paying policies and contracts along with the assets backing them (known as a closed block) established as a way to protect the interests of preexisting policyholders from the competing interests of the entity's stockholders. Includes liabilities attributable to and assets allocated to the closed block, the use of cash flows from the closed block, and the operating rules established for the closed block. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ClosedBlockTermsOfOperation |