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cm:Concept: us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation
Standard label: Coal Industry Retiree Health Benefit Act of 1992, Estimated Amount of Obligation
Name: us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation
Documentation: Amount of obligation for medical and death benefits to be provided under Coal Industry Retiree Health Benefit Act of 1992.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: As Of (instant)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation

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Labels
Label Role Language
Coal Industry Retiree Health Benefit Act of 1992, Estimated Amount of Obligation http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 930 715 50 1 http://fasb.org/us-gaap/role/ref/legacyRef 930