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cm:Concept: us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
Standard label: Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax
Name: us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
Documentation: Amount, before tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income 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:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax

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Labels
Label Role Language
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax http://www.xbrl.org/2003/role/label en-US
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (i-k) 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

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