cm:Concept: us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase |
us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase |
Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase. |
cm:Concept |
Monetary (xbrli:monetaryItemType) |
For Period (duration) |
Debit |
false |
us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase |