cm:Table: us-gaap:LiabilitiesForGuaranteesOnLongDurationContractsTable
| Liabilities for Guarantees on Long-Duration Contracts [Table] |
| us-gaap:LiabilitiesForGuaranteesOnLongDurationContractsTable |
| A table reflecting the guaranteed minimum benefits by product type due contract holders under annuity and life products having traditional and nontraditional terms. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:LiabilitiesForGuaranteesOnLongDurationContractsTable |