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Contingencies and Legal Proceedings Legal Proceedings (Details) (USD $) | 1 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |  |
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Oct. 31, 2007 Legal_actions | Mar. 31, 2015 Megawatts | Apr. 30, 2011 Agreements Groups | Sep. 30, 2010 | Mar. 31, 2010 People | Dec. 31, 2010 Years | Jun. 30, 2012 | Jul. 31, 2013 Legal_actions | May 31, 2013 | Aug. 31, 2011 | Jun. 30, 2008 Legal_actions | Sep. 30, 2012 | Nov. 30, 2009 People Legal_actions | Dec. 31, 2011 Legal_actions | Jun. 30, 2011 Units Megawatts | Jun. 30, 2010 | Apr. 30, 2015 Legal_actions
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible additional future costs for compliance with Clean Air Act requirements |  | $ 800,000,000 tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Megawatts option 1 |  | 700 tve_Megawatts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TDEC civil penalties related to Gallatin |  | 17,000 tve_TDECcivilpenaltiesrelatedtoGallatin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plaintiff civil penalties related to Gallatin |  | 37,500 tve_PlaintiffcivilpenaltiesrelatedtoGallatin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Affected by Paradise Case |  | 2 tve_UnitsAffectedbyParadiseCase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims dismissed related to NPDES permit |  | 7 tve_NumberofclaimsdismissedrelatedtoNPDESpermit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims filed on Gallatin NPDES permit |  | 8 tve_NumberofclaimsfiledonGallatinNPDESpermit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reactors a CCOLA was submitted for | 2 tve_NumberofreactorsaCCOLAwassubmittedfor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units at John Sevier Fossil |  | 4 tve_NumberofunitsatJohnSevierFossil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  | 151,000,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LitigationCaseAxis = tve_GeneralMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum |  | 151,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LitigationCaseAxis = tve_GeneralMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  | 153,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LitigationCaseAxis = tve_GeneralMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of similar environmental agreements entered into |  |  | 2 tve_NumberOfSimilarEnvironmentalAgreementsEnteredInto / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with the EPA |  |  | 1 tve_NumberOfEnvironmentalAgreementsEnteredIntoWithEpa / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee |  |  | 1 tve_NumberOfEnvironmentalAgreementsEnteredIntoWithAlabamaKentuckyNorthCarolinaAndTennessee / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with environmental advocacy groups |  |  | 3 tve_Numberenvironmentaladvocacygroupswithwhichthereisanenvironmentalagreement. / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units to be idled |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 tve_NumberOfUnitsToBeIdled / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Megawatts option 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200 tve_Megawatts / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Megawatts option 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500 tve_MegawattsOption2 / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Amount to be invested in certain TVA environmental projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000,000 tve_AmountToBeInvestedInCertainEnvironmentalProjects / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Amount to be provided to fund environmental projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 tve_AmountToBeProvidedToFundEnvironmentalProjects / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Amount to pay civil penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 tve_AmountToPayCivilPenalties / us-gaap_LitigationCaseAxis = tve_EnvironmentalAgreementsMember |  |
Kingston Ash Spill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed |  | 78 tve_NumberOfLawsuitsFiled / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits dismissed |  | 15 tve_NumberOfLawsuitsDismissed / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  | 63 us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active lawsuits |  | 9 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements |  | 28,000,000 us-gaap_PaymentsForLegalSettlements / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Settled, Number |  | 7 us-gaap_LossContingencyClaimsSettledNumber / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Civil penalty order issued June 1, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 tve_CivilPenaltyOrderIssuedJune12010 / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |
Amount of civil penalty order satisfied |  | 10,000,000 tve_AmountOfCivilPenaltyOrderSatisfied / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit against civil penalty order |  | 2,000,000 tve_CreditAgainstCivilPenaltyOrder / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Down payment on natural resource damages |  | 750,000 tve_DownPaymentOnNaturalResourceDamages / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Case Involving Tennessee Valley Authority Retirement System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Board Members Appointed |  |  |  |  | 1 tve_NumberofBoardMembersAppointed / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |  |
Number of participants that filed suit |  |  |  |  | 8 tve_NumberOfParticipantsThatFiledSuit / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |  |
Number of TVARS Board members |  |  |  |  | 6 tve_NumberOfBoardMembers / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment before January 1, 2010 |  |  |  |  |  | 55 tve_RetirementageofeligibilityforcostoflivingadjustmentbeforeJanuary12010 / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment after January 1, 2010 |  |  |  |  |  | 60 tve_RetirementAgeOfEligibilityForCostOfLivingAdjustmentAfterJanuary12010 / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |
Remaining defendant |  |  |  |  | 1 tve_RemainingDefendant / us-gaap_LitigationCaseAxis = tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember |  |  |  |  |  |  |  |  |  |  |  |
Number of days to file an ammended complaint |  |  |  | 14 days |  |  |  |  |  |  |  |  |  |  |  |  |
Case Involving the NRC Waste Confidence Decision on Spent Nuclear Fuel Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years that spent fuel can be stored after a plant's license is terminated |  |  |  |  |  |  | 60 years |  |  |  |  |  |  |  |  |  |
Administrative Proceedings Regarding Sequoyah U1 and U2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL BEST and MATRR |  |  |  |  |  |  |  |  | 8 tve_NumberofcontentionssubmittedbyBREDLBESTandMATRR / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |
Opposed contentions |  |  |  |  |  |  |  |  | 8 tve_Opposedcontentions / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |
Number of petitioners with standing |  |  |  |  |  |  |  | 1 tve_Numberofpetitionerswithstanding / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |  |
Number of petitioners |  |  |  |  |  |  |  | 3 tve_Numberofpetitioners / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |  |
Number of contentions dismissed |  |  |  |  |  |  |  | 7 tve_NumberOfContentionsDismissed / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |  |
Number of contentions left |  |  |  |  |  |  |  | 1 tve_NumberOfContentionsLeft / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member |  |  |  |  |  |  |  |  |
Administrative Proceedings Regarding Bellefonte Units 3 and 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions left |  |  |  |  |  |  |  |  |  |  | 2 tve_NumberOfContentionsLeft / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |  |
Number of admitted contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  | 4 tve_NumberOfAdmittedContentionsSubmittedByBredlAndSace / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |  |
Number of contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  | 20 tve_NumberOfContentionsSubmittedByBredlAndSace / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |  |
Number of contentions no longer admitted |  |  |  |  |  |  |  |  |  |  | 2 tve_NumberOfContentionsNoLongerAdmitted / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |  |
Number of BREDL contentions |  |  |  |  |  |  |  |  |  |  |  | 1 tve_NumberofBREDLcontentions / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |
Number of SACE contentions |  |  |  |  |  |  |  |  |  | 1 tve_NumberOfSaceContentions / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member |  |  |  |  |  |  |
Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions dismissed |  |  |  |  |  |  |  |  |  |  |  |  | 1 tve_NumberOfContentionsDismissed / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member |  |  |  |
Number of contentions admitted for hearing |  |  |  |  |  |  |  |  |  |  |  |  | 2 tve_NumberOfContentionsAdmittedForHearing / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member |  |  |  |
Number of SACE contentions |  |  |  |  |  |  |  |  |  |  |  | 1 tve_NumberOfSaceContentions / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member | 7 tve_NumberOfSaceContentions / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member |  |  |  |
Number of other petitioners |  |  |  |  |  |  |  |  |  |  |  |  | 4 tve_NumberOfOtherPetitioners / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member |  |  |  |
Number of contentions remaining |  |  |  |  |  |  |  |  |  |  |  |  | 1 tve_NumberOfContentionsRemaining / us-gaap_LitigationCaseAxis = tve_AdministrativeProceedingsRegardingWattsBarNuclearPlantUnit2Member |  |  |  |
Petitions Resulting from Japanese Nuclear Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of requests accepted by the NRC |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 tve_NumberOfRequestsAcceptedByNrc / us-gaap_LitigationCaseAxis = tve_PetitionsResultingFromJapaneseNuclearEventsMember |  |  |
Other Noncurrent Liabilities [Member] | General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  | 79,000,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_LitigationCaseAxis = tve_GeneralMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Payable and Accrued Liabilities [Member] | General |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  | $ 72,000,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_LitigationCaseAxis = tve_GeneralMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Kingston Ash Spill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 tve_NumberOfLawsuitsDismissed / us-gaap_LitigationCaseAxis = tve_LegalProceedingsRelatedToKingstonAshSpillMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition The amount of the civil penalty order that has been satisfied. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount to be invested in certain environmental projects + References No definition available. + Details
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- Definition Amount to be provided to fund environmental projects in Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount to pay civil penalties + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
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- Definition Civil penalty order issued by TDEC for the Kingston ash spill citing violations of the Tennessee Solid Waste Disposal Act and the Tennessee Water Control Quality Act. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of credit against the civil penalty order that was received for environmental projects. + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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- Definition A down payment on natural resource damages paid each year for three years. + References No definition available. + Details
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Namespace Prefix: | tve_
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- Definition Megawatts of summer net capability + References No definition available. + Details
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- Definition Megawatts option 2 + References No definition available. + Details
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Namespace Prefix: | tve_
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- Definition Number environmental advocacy groups with which there is an environmental agreement. + References No definition available. + Details
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- Definition Number of admitted contentions submitted by BREDL and SACE + References No definition available. + Details
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- Definition Number of board members + References No definition available. + Details
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- Definition The number of Board members appointed. + References No definition available. + Details
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- Definition Number of BREDL contentions + References No definition available. + Details
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- Definition The number of claims dismissed that were filed by environmental groups to challenge the NPDES permit on Gallatin Fossil Plant. + References No definition available. + Details
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- Definition The number of claims filed by environmental groups to challenge the NPDES permit on Gallatin Fossil Plant. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Definition Number of contentions admitted for hearing + References No definition available. + Details
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- Definition Number of contentions dismissed + References No definition available. + Details
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- Definition Number of contentions left + References No definition available. + Details
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- Definition Number of contentions no longer admitted + References No definition available. + Details
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- Definition Number of contentions remaining + References No definition available. + Details
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- Definition Number of contentions submitted by BREDL and SACE + References No definition available. + Details
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- Definition Number of contentions submitted by BREDL BEST and MATRR + References No definition available. + Details
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- Definition Number of days to file an ammended complaint + References No definition available. + Details
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- Definition Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
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- Definition Number of environmental agreements entered into with the EPA + References No definition available. + Details
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- Definition Number of lawsuits dismissed + References No definition available. + Details
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