Index Index

Coal Contract [Member]

NameCoalContractMember
Namespacehttp://fasb.org/us-gaap/2020-01-31
Prefixus-gaap
Data typenonnum:domainItemType
Period typeduration
Substitution Groupxbrli:item
BalanceNone
NillableTrue
AbstractTrue

Labels

TextLangRoleContainer role
Coal Contract [Member]en-UShttp://www.xbrl.org/2003/role/labelhttp://www.xbrl.org/2003/role/link
Derivative instrument whose primary underlying risk is tied to coal.en-UShttp://www.xbrl.org/2003/role/documentationhttp://www.xbrl.org/2003/role/link

Related Parent Concepts

NameRelation TypeRole
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/BalanceSheetOffsetting
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/BalanceSheetOffsettingOffsettingAssetsTable
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/BalanceSheetOffsettingOffsettingLiabilitiesTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivities
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivitiesDerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivitiesDerivativeTable
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivitiesFairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosuresFairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/TransfersAndServicing
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/TransfersAndServicingTransferOfFinancialAssetsAccountedForAsSalesTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThrift
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfFinancialAssetsAccountedForAsSalesTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesBrokersAndDealers
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesBrokersAndDealersTransferOfFinancialAssetsAccountedForAsSalesTable
us-gaap:DerivativeContractTypeDomain
parent-childhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany
us-gaap:DerivativeContractTypeDomain
domain-memberhttp://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable

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