cm:Concept: us-gaap:SeparateAccountsOfContractHoldersNote
| Separate Accounts of Contract Holders Note |
| us-gaap:SeparateAccountsOfContractHoldersNote |
| Disclose the general nature of the contracts reported in separate accounts of contract holders, the nature and terms of minimum guarantees, the fair value of each major category of investment comprising the separate accounts, and the amount of gains and losses recognized on assets transferred to separate accounts. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SeparateAccountsOfContractHoldersNote |