cm:Concept: us-gaap:LiabilityForPolicyholderContractDepositsGeneralAssumptions
| Liability for Policyholder Contract Deposits, General Assumptions |
| us-gaap:LiabilityForPolicyholderContractDepositsGeneralAssumptions |
| General assumptions associated with the liability for estimated reserve for cumulative deposits plus credited interest and fund performance, less withdrawals, expenses and cost of insurance charges, as applicable. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LiabilityForPolicyholderContractDepositsGeneralAssumptions |