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cm:Concept: us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Standard label: Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax
Name: us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Documentation: Amount, after tax, of accumulated other comprehensive (income) loss for 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: As Of (instant)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

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Labels
Label Role Language
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax http://www.xbrl.org/2003/role/label en-US
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after 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 14A http://fasb.org/us-gaap/role/ref/legacyRef 220
FASB Accounting Standards Codification 220 10 45 10A (i-k) http://fasb.org/us-gaap/role/ref/legacyRef 220

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