cm:Concept: us-gaap:DeferredTaxLiabilityNotRecognizedEventsThatWouldCauseTemporaryDifferenceToBeTaxablePolicyholdersSurplus
| Deferred Tax Liability Not Recognized, Events that Would Cause Temporary Difference to be Taxable, Policyholders' Surplus |
| us-gaap:DeferredTaxLiabilityNotRecognizedEventsThatWouldCauseTemporaryDifferenceToBeTaxablePolicyholdersSurplus |
| Description of events that would cause the temporary difference for which a deferred tax liability has not been recognized, because of the exceptions to comprehensive recognition of deferred taxes related to a policyholders' surplus, to become taxable. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DeferredTaxLiabilityNotRecognizedEventsThatWouldCauseTemporaryDifferenceToBeTaxablePolicyholdersSurplus |