cm:Concept: us-gaap:DefinedBenefitPlanBenefitObligationPrescriptionDrugSubsidyReceipt
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt |
us-gaap:DefinedBenefitPlanBenefitObligationPrescriptionDrugSubsidyReceipt |
Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan. |
cm:Concept |
Monetary (xbrli:monetaryItemType) |
For Period (duration) |
Debit |
false |
us-gaap:DefinedBenefitPlanBenefitObligationPrescriptionDrugSubsidyReceipt |