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cm:Concept: us-gaap:DefinedBenefitPlanActualReturnOnPlanAssets
Standard label: Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Name: us-gaap:DefinedBenefitPlanActualReturnOnPlanAssets
Documentation: Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.
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:DefinedBenefitPlanActualReturnOnPlanAssets

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Labels
Label Role Language
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 715 20 50 1 (b)(1) http://www.xbrl.org/2003/role/disclosureRef 715
FASB Accounting Standards Codification 715 20 55 17 http://www.xbrl.org/2003/role/exampleRef 715

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