cm:Level1TextBlock: us-gaap:ScheduleOfDividendPaymentRestrictionsTextBlock
| Dividend Payment Restrictions [Text Block] |
| us-gaap:ScheduleOfDividendPaymentRestrictionsTextBlock |
| The entire disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ScheduleOfDividendPaymentRestrictionsTextBlock |
| DividendPaymentRestrictions |