cm:Concept: us-gaap:LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate
| Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |
| us-gaap:LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate |
| Original weighted-average discount rate at contract issue date used to measure liability for future policy benefit. |
| cm:Concept |
| Percent (num:percentItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate |