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exposure to loss based upon the casualty value provisions3false0us-gaap_VariableInterestMaximumExposureToLossus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6truefalsefalse13600000001360000000falsetruefalsetruefalse7truefalsefalse666000000666000000falsetruefalsetruefalse8truefalsefalse622000000622000000falsetruefalsetruefalse9truefalsefalse622000000622000000falsetruefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryQuantifies the entity's maximum exposure to loss.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C6 -Subparagraph c falsefalseMaximum Exposure4false0fe_VariableInterestEntitiesDiscountedLeasePaymentsNetfefalsedebitinstantDiscounted Lease Payments, net.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:monetaryItemTypemonetaryDiscounted Lease Payments, net.No authoritative reference available.falsefalseDiscounted Lease Payments, net5false0fe_VariableInterestEntitiesNetExposurefefalsecreditinstantVariable Interest Entities Net Exposure.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:monetaryItemTypemonetaryVariable Interest Entities Net Exposure.No authoritative reference available.falsefalseVariable Interest Entities Net Exposure6true0fe_VariableInterestEntitiesTextualsAbstractfefalsenadurationVariable Interest Entities.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:stringItemTypestringVariable Interest Entities.falsefalseVariable Interest Entities (Textuals) [Abstract]7false0fe_BondableStrandedCostsOutstandingOfPreviouslyDivestedOysterCreekNuclearGeneratingStationfefalsecreditinstantBondable Stranded Costs Outstanding Of Previously Divested Oyster Creek Nuclear Generating Station.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse310000000310000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryBondable Stranded Costs Outstanding Of Previously Divested Oyster Creek Nuclear Generating Station.No authoritative reference available.falsefalseBondable stranded costs outstanding of previously divested Oyster Creek nuclear generating station8false0fe_VariableInterestEntitiesDistributionsToOwnersfefalsecreditdurationVariable interest entities distributions to owners.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-5000000-5000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryVariable interest entities distributions to owners.No authoritative reference available.falsefalseDistributions to owners9false0us-gaap_NetIncomeLossAttributableToNoncontrollingInterestus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-24000000-24000000falsefalsefalsefalsefalse2truefalsefalse-16000000-16000000falsefalsefalsefalsefalse3truefalsefalse-3000000-3000000falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 falsefalseNet losses of the noncontrolling interests10false0us-gaap_EquityMethodInvestmentsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11truefalsefalse125000000125000000falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment losses recognized.No authoritative reference available.falsefalseEquity investment joint venture by FEV11false0fe_VariableInterestEntitiesPercentageOfMiningOperationsAcquiredByJointVenturefefalsenainstantVariable interest entities percentage of mining operations acquired by joint venture.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11truetruefalse0.800.80falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable interest entities percentage of mining operations acquired by joint venture.No authoritative reference available.falsefalsePercentage of mining operations acquired by joint venture12false0fe_VariableInterestEntitiesPercentageOfTransportationOperationsAcquiredByJointVenturefefalsenainstantVariable interest entities percentage of transportation operations acquired by joint venture.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11truetruefalse11falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable interest entities percentage of transportation operations acquired by joint venture.No authoritative reference available.falsefalsePercentage of transportation operations acquired by joint venture13false0fe_VariableInterestEntitiesEconomicInterestOfEntityOneInJointVenturefefalsenainstantVariable interest entities economic interest of entity one in joint venture.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11truetruefalse0.450.45falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable interest entities economic interest of entity one in joint venture.No authoritative reference available.falsefalseEconomic interest of FEV in joint venture14false0fe_VariableInterestEntitiesEconomicInterestOfEntityTwoInJointVenturefefalsenainstantVariable interest entities economic interest of entity two in joint venture.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5truetruefalse0.550.55falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable interest entities economic interest of entity two in joint venture.No authoritative reference available.falsefalseEconomic interest of an affiliate of the Boich Companies in joint venture15false0us-gaap_VariableInterestEntityOwnershipPercentageus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3truetruefalse0.500.50falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepurePercentage of the VIE's voting interest owned by the registrant. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company.No authoritative reference available.falsefalseVoting interest of FEV and an affiliate of the Boich Companies in the joint venture16false0fe_VariableInterestEntitiesAmountAgreedToBePaidByEntityOneToEntityTwoForPurchaseOfAdditionalEconomicInterestfefalsecreditdurationVariable interest entities amount agreed to be paid by entity one to entity two for purchase of additional economic 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interest purchased by entity one.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10truetruefalse0.050.05falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepurePercentage of additional economic interest purchased by entity one.No authoritative reference available.falsefalsePercentage of additional economic interest purchased by FEV in the Signal Peak mining and coal transportation operations18false0fe_PercentageOfRemainingStakeAcquiredByJointVentureInMiningOperationsfefalsenainstantPercentage of remaining stake acquired by joint venture in mining operations.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4truetruefalse0.200.20falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepurePercentage of remaining stake acquired by joint venture in mining operations.No authoritative reference available.falsefalsePercentage of remaining stake acquired by joint venture in the mining operations19false0fe_IssuanceOfNotesInConnectionWithJointVentureAcqusitionfefalsecreditinstantIssuance of notes in connection with joint venture acqusition.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse4750000047500000falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryIssuance of notes in connection with joint venture acqusition.No authoritative reference available.falsefalseIssuance of notes in connection with joint venture acqusition, amount20false0fe_DurationOfNoteIssuedByJointVenturefefalsenainstantDuration of note issued by joint 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acquisition.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4truefalsefalse3000000030000000falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryCharge to other paid in capital resulting from joint venture acquisition.No authoritative reference available.falsefalseOther paid in capital resulted from acquisitions22false0fe_VariableInterestEntitiesPercentageOfEquityInterestByUnaffiliatedThirdPartyIncludedInOwnershipOfEntityThreefefalsenadurationVariable interest entities Percentage of equity interest by unaffiliated third party included in Ownership of entity three.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.030.03falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7falsetruefalse00falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable interest entities Percentage of equity interest by unaffiliated third party included in Ownership of entity three.No authoritative reference available.falsefalsePercentage of equity interest by an unaffiliated third party included in ownership of PNBV23false0fe_VariableInterestEntitiesPercentageOfEquityInterestHeldByWhollyOwnedSubsidiaryOfEntityFourfefalsenadurationVariable Interest Entities Percentage Of Equity Interest Held By Wholly Owned Subsidiary Of Entity Four.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsetruefalse7truetruefalse0.030.03falsefalsefalsetruefalse8falsetruefalse00falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepureVariable Interest Entities Percentage Of Equity Interest Held By Wholly Owned Subsidiary Of Entity Four.No authoritative reference available.falsefalsePercentage of equity interest held by OES Ventures, a wholly owned subsidiary of OE24false0fe_VariableInterestEntitiesNetPresentValueOfParentCompanyConsolidatedSaleAndLeasebackOperatingLeaseCommitmentsfefalsecreditdurationVariable interest entities net present value of parent company consolidated sale and leaseback operating lease commitments.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse16000000001600000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryVariable interest entities net present value of parent company consolidated sale and leaseback operating lease commitments.No authoritative reference available.falsefalseNet present value of FirstEnergy's consolidated sale and leaseback operating lease commitments25false0fe_NumberOfLongTermPowerPurchaseAgreementsMaintainedByParentCompanyWithNonUtilityGenerationEntitiesfefalsenadurationNumber of long term power purchase agreements maintained by parent company with Non utility generation entities.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2121falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:integerItemTypeintegerNumber of long term power purchase agreements maintained by parent company with Non utility generation entities.No authoritative reference available.falsefalseNumber of long-term power purchase agreements maintained by FirstEnergy with NUG entities26false0fe_LongTermContractForPurchaseOfElectricPowerCostIncurredfefalsedebitdurationLong Term Contract For Purchase of Electric Power Cost Incurred.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse243000000243000000falsetruefalsefalsefalse2truefalsefalse225000000225000000falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryLong Term Contract For Purchase of Electric Power Cost Incurred.No authoritative reference available.falsefalsePurchased power costs from entities27false0fe_LongTermPowerPurchaseAgreementsfefalsenadurationLong-term power purchase agreements.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse13391339falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalseOtherxbrli:integerItemTypeintegerLong-term power purchase agreements.No authoritative reference available.falsefalseLong-term power purchase agreements1126Variable Interest Entities (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue