cm:Concept: us-gaap:StatutoryDividendPaymentRestrictionsDisclosure
| Statutory Dividend Payment Restrictions Disclosure |
| us-gaap:StatutoryDividendPaymentRestrictionsDisclosure |
| Disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities, amounts not available for future dividend payments, and amount of dividends paid. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:StatutoryDividendPaymentRestrictionsDisclosure |