cm:Concept: us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation
Coal Industry Retiree Health Benefit Act of 1992, Estimated Amount of Obligation |
us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation |
Amount of obligation for medical and death benefits to be provided under Coal Industry Retiree Health Benefit Act of 1992. |
cm:Concept |
Monetary (xbrli:monetaryItemType) |
As Of (instant) |
Credit |
false |
us-gaap:CoalIndustryRetireeHealthBenefitActOf1992EstimatedAmountOfTotalObligation |