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cm:Concept: us-gaap:OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Standard label: Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax
Name: us-gaap:OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Documentation: Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax

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Labels
Label Role Language
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (j) http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 45 11 http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 715 20 50 1 (i) http://fasb.org/us-gaap/role/ref/legacyRef 715

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Roll Up Relations
Part Of Roll Up:
us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax