cm:Concept: us-gaap:CashSurrenderValueDuePolicyholdersDescription
| Cash Surrender Value Due Policyholders, Description |
| us-gaap:CashSurrenderValueDuePolicyholdersDescription |
| Description of the entity's obligations under long-duration contracts with respect to the amount it must pay to policyholders upon their terminating, or surrendering, their insurance contracts. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:CashSurrenderValueDuePolicyholdersDescription |