cm:Member: us-gaap:AnnuitizationBenefitMember
| Annuitization Benefit [Member] |
| us-gaap:AnnuitizationBenefitMember |
| The benefit in long-duration contracts to provide a guaranteed annuity payment commencing with the annuitization date. The fixed periodic annuity payments may be determined using the higher of the current accumulated account value that exists at the date of annuitization or the guaranteed amount. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:AnnuitizationBenefitMember |