cm:Member: us-gaap:FixedMaturitiesMember
| Fixed Maturities [Member] |
| us-gaap:FixedMaturitiesMember |
| This element provides types of investments that may be contained within the fixed maturity category which are securities having a stated final repayment date. Examples of items within this category may include bonds, including convertibles and bonds with warrants, and redeemable preferred stocks. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:FixedMaturitiesMember |