XML 24 R76.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Contingencies and Legal Proceedings Legal Proceedings (Details) (USD $) | 9 Months Ended |  |  | 1 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Oct. 31, 2007 reactors | Jun. 30, 2014 General | Apr. 30, 2011 Environmental Agreements Groups Agreements | Jun. 30, 2011 Environmental Agreements Megawatts Units | Jun. 30, 2014 Kingston Ash Spill Legal_actions | Jun. 30, 2010 Kingston Ash Spill | Sep. 30, 2010 Case Involving Tennessee Valley Authority Retirement System | Mar. 31, 2010 Case Involving Tennessee Valley Authority Retirement System People | Dec. 31, 2010 Case Involving Tennessee Valley Authority Retirement System Years | Jun. 30, 2012 Case Involving the NRC Waste Confidence Decision on Spent Nuclear Fuel Storage | Jul. 31, 2013 Administrative Proceedings Regarding Sequoyah U1 and U2 [Member] Legal_actions | May 31, 2013 Administrative Proceedings Regarding Sequoyah U1 and U2 [Member] | Aug. 31, 2011 Administrative Proceedings Regarding Bellefonte Units 3 and 4 | Jun. 30, 2008 Administrative Proceedings Regarding Bellefonte Units 3 and 4 Legal_actions | Sep. 30, 2012 Administrative Proceedings Regarding Bellefonte Units 3 and 4 | Nov. 30, 2009 Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2 People Legal_actions | Sep. 30, 2012 Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2 Legal_actions | Jun. 30, 2014 Gallatin Fossil Plant NPDES Permit Administrative Appeal [Member] Legal_actions | Dec. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Aug. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Jun. 30, 2014 Other Noncurrent Liabilities [Member] General | Jun. 30, 2014 Accounts Payable and Accrued Liabilities [Member] General | Jun. 30, 2014 Other Regulatory Assets (Liabilities) [Member] General | Aug. 01, 2014 Scenario, Forecast [Member] Kingston Ash Spill Legal_actions
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  | $ 254,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 139,000,000 | $ 87,000,000 | $ 28,000,000 |
Loss Contingency, Range of Possible Loss, Minimum | 1,100,000,000 |  | 254,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 1,200,000,000 |  | 256,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of similar environmental agreements entered into |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with the EPA |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Board Members Appointed |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with environmental advocacy groups |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units to be idled |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Megawatts option 1 |  |  |  |  | 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Megawatts option 2 |  |  |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be invested in certain TVA environmental projects |  |  |  |  | 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be provided to fund environmental projects |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to pay civil penalties |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed |  |  |  |  |  | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits dismissed |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active lawsuits |  |  |  |  |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9
Number of lawsuits filed under various environmental statutes |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Civil penalty order issued June 1, 2010 |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of civil penalty order satisfied |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit against civil penalty order |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Down payment on natural resource damages |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of participants that filed suit |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of TVARS Board members |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment before January 1, 2010 |  |  |  |  |  |  |  |  |  | 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment after January 1, 2010 |  |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants that filed a motion to dismiss |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual defendants |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining defendant |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days to file an ammended complaint |  |  |  |  |  |  |  | 14 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Affected by Paradise Case | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units at Paradise Fossil Plants | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years that spent fuel can be stored after a plant's license is terminated |  |  |  |  |  |  |  |  |  |  | 60 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL BEST and MATRR |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Opposed contentions |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Number of petitioners with standing |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of petitioners |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions dismissed |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of contentions left |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of nuclear reactors |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of admitted contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Number of contentions no longer admitted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of BREDL contentions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of contentions admitted for hearing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of SACE contentions |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 7 | 1 |  |  |  |  |  |  |
Number of other petitioners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Number of contentions remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of John Sevier units retired | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units at John Sevier Fossil | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of John Sevier units idled | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims not dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of requests accepted by the NRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Number of separate petitions filed by the Natural Resources Defense Council |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |

X
- Definition The amount of the civil penalty order that has been satisfied. + References No definition available. + Details
Name: | tve_AmountOfCivilPenaltyOrderSatisfied
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount to be invested in certain environmental projects + References No definition available. + Details
Name: | tve_AmountToBeInvestedInCertainEnvironmentalProjects
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount to be provided to fund environmental projects in Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
Name: | tve_AmountToBeProvidedToFundEnvironmentalProjects
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount to pay civil penalties + References No definition available. + Details
Name: | tve_AmountToPayCivilPenalties
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | tve_CivilPenaltyOrderIssuedJune12010
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of credit against the civil penalty order that was received for environmental projects. + References No definition available. + Details
Name: | tve_CreditAgainstCivilPenaltyOrder
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition A down payment on natural resource damages paid each year for three years. + References No definition available. + Details
Name: | tve_DownPaymentOnNaturalResourceDamages
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Megawatts of summer net capability + References No definition available. + Details
Name: | tve_Megawatts
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Megawatts option 2 + References No definition available. + Details
Name: | tve_MegawattsOption2
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number environmental advocacy groups with which there is an environmental agreement. + References No definition available. + Details
Name: | tve_Numberenvironmentaladvocacygroupswithwhichthereisanenvironmentalagreement.
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of admitted contentions submitted by BREDL and SACE + References No definition available. + Details
Name: | tve_NumberOfAdmittedContentionsSubmittedByBredlAndSace
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of board members + References No definition available. + Details
Name: | tve_NumberOfBoardMembers
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of Board members appointed. + References No definition available. + Details
Name: | tve_NumberofBoardMembersAppointed
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of BREDL contentions + References No definition available. + Details
Name: | tve_NumberofBREDLcontentions
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of claims not dismissed + References No definition available. + Details
Name: | tve_Numberofclaimsnotdismissed
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions admitted for hearing + References No definition available. + Details
Name: | tve_NumberOfContentionsAdmittedForHearing
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions dismissed + References No definition available. + Details
Name: | tve_NumberOfContentionsDismissed
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions left + References No definition available. + Details
Name: | tve_NumberOfContentionsLeft
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions no longer admitted + References No definition available. + Details
Name: | tve_NumberOfContentionsNoLongerAdmitted
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions remaining + References No definition available. + Details
Name: | tve_NumberOfContentionsRemaining
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions submitted by BREDL and SACE + References No definition available. + Details
Name: | tve_NumberOfContentionsSubmittedByBredlAndSace
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of contentions submitted by BREDL BEST and MATRR + References No definition available. + Details
Name: | tve_NumberofcontentionssubmittedbyBREDLBESTandMATRR
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of days to file an ammended complaint + References No definition available. + Details
Name: | tve_NumberOfDaysToFileAmmendedComplaint
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defendants that filed a motion to dismiss + References No definition available. + Details
Name: | tve_NumberOfDefendantsThatFiledMotionToDismiss
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
Name: | tve_NumberOfEnvironmentalAgreementsEnteredIntoWithAlabamaKentuckyNorthCarolinaAndTennessee
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of environmental agreements entered into with the EPA + References No definition available. + Details
Name: | tve_NumberOfEnvironmentalAgreementsEnteredIntoWithEpa
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of individual defendants + References No definition available. + Details
Name: | tve_NumberOfIndividualDefendants
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of John Sevier units idled + References No definition available. + Details
Name: | tve_NumberofJohnSevierunitsidled
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of John Sevier units retired for the John Sevier Plant Clean Air Act Permit + References No definition available. + Details
Name: | tve_NumberofJohnSevierunitsretired
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of lawsuits dismissed + References No definition available. + Details
Name: | tve_NumberOfLawsuitsDismissed
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of lawsuits filed + References No definition available. + Details
Name: | tve_NumberOfLawsuitsFiled
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of lawsuits filed by individuals and environmental groups under various environmental statutes. + References No definition available. + Details
Name: | tve_NumberOfLawsuitsFiledUnderVariousEnvironmentalStatutes
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of nuclear reactors + References No definition available. + Details
Name: | tve_NumberOfNuclearReactors
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of other petitioners + References No definition available. + Details
Name: | tve_NumberOfOtherPetitioners
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of participants that filed suit. + References No definition available. + Details
Name: | tve_NumberOfParticipantsThatFiledSuit
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of petitioners + References No definition available. + Details
Name: | tve_Numberofpetitioners
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of petitioners with standing + References No definition available. + Details
Name: | tve_Numberofpetitionerswithstanding
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of requests accepted by the NRC + References No definition available. + Details
Name: | tve_NumberOfRequestsAcceptedByNrc
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of SACE contentions + References No definition available. + Details
Name: | tve_NumberOfSaceContentions
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of separate petitions filed by the Natural Resources Defense Council + References No definition available. + Details
Name: | tve_NumberOfSeparatePetitionsFiledByNaturalResourcesDefenseCouncil
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of similar environmental agreements entered into + References No definition available. + Details
Name: | tve_NumberOfSimilarEnvironmentalAgreementsEnteredInto
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of units at John Sevier Fossil + References No definition available. + Details
Name: | tve_NumberofunitsatJohnSevierFossil
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of units to be idled. + References No definition available. + Details
Name: | tve_NumberOfUnitsToBeIdled
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of years that spent fuel can be stored after a plant's license is terminated + References No definition available. + Details
Name: | tve_NumberOfYearsThatSpentFuelCanBeStoredAfterPlantsLicenseIsTerminated
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Opposed contentions + References No definition available. + Details
Name: | tve_Opposedcontentions
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining defendant + References No definition available. + Details
Name: | tve_RemainingDefendant
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Retirement age of eligibility for cost of living adjustment after January 1, 2010. + References No definition available. + Details
Name: | tve_RetirementAgeOfEligibilityForCostOfLivingAdjustmentAfterJanuary12010
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Retirement age of eligibility for cost of living adjustment before January 1, 2010. + References No definition available. + Details
Name: | tve_RetirementageofeligibilityforcostoflivingadjustmentbeforeJanuary12010
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Units Affected by Paradise Case + References No definition available. + Details
Name: | tve_UnitsAffectedbyParadiseCase
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Units at Paradise Fossil Plants + References No definition available. + Details
Name: | tve_UnitsatParadiseFossilPlants
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant