cm:Concept: us-gaap:LiabilityForFuturePolicyBenefitNoChangeInExpenseAssumptionPolicyElection
| Liability for Future Policy Benefit, No Change in Expense Assumption, Policy Election [true false] |
| us-gaap:LiabilityForFuturePolicyBenefitNoChangeInExpenseAssumptionPolicyElection |
| Indicates (true false) whether accounting policy was elected not to update expense assumption used in measuring liability for future policy benefit. Assumption includes, but is not limited to, estimate for termination or settlement cost and cost after premium-paying period of insurance contract. |
| cm:Concept |
| Yes/No (xbrli:booleanItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:LiabilityForFuturePolicyBenefitNoChangeInExpenseAssumptionPolicyElection |