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Contingencies and Legal Proceedings Contingencies (Details) (USD $) | 6 Months Ended
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Mar. 31, 2015 reactors Insurance_layers Procedures Units Sites
Loss Contingencies [Line Items] |
Nuclear liability insurance | $ 375,000,000 tve_NuclearLiabilityInsurance
Number of sites | 1 tve_NumberOfSites
Assessment from licensees for each licensed reactor | 127,000,000 tve_AssessmentFromLicenseesForEachLicensedReactor
Number of licensed reactors in US | 104 tve_NumberoflicensedreactorsinUS
Nuclear accident assessment limitation per year per unit | 19,000,000 tve_NuclearAccidentAssessmentLimitationPerYearPerUnit
Number of licensed nuclear units | 6 tve_NumberOfLicensedNuclearUnits
Maximum assessment per nuclear incident | 764,000,000 tve_MaximumAssessmentPerNuclearIncident
Maximum payment required per incident in any one year | 114,000,000 tve_MaximumPaymentRequiredPerAccidentInAnyOneYear
Total amount of protection available | 13,000,000,000 tve_TotalAmountOfProtectionAvailable
Surcharge for legal expenses | 5.00%tve_SurchargeForLegalExpenses
Number of layers before Congress is required to take action | 2 tve_USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted
Amount of property, decommissioning, and decontamination insurance carried | 5,100,000,000 tve_AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried
Amount of insurance available for loss at any one site | 2,100,000,000 tve_AmountOfInsuranceAvailableForLossAtAnyOneSite
Maximum amount of retrospecitve premiums | 120,000,000 tve_Maximumamountofretrospectivepremiums
Maximum indemnity if a covered accident takes or keeps a nuclear unit offline | 490,000,000 tve_MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline
Maximum retrospective premiums | 35,000,000 tve_RetrospectivePremiums
Number of procedures for determining estimates for the costs of nuclear decommissioning | 2 tve_NumberOfProceduresForDeterminingEstimatesForCostsOfNuclearDecommissioning
Possible additional future costs for compliance with Clean Air Act requirements | 800,000,000 tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements
Amount of settlement for potential liability related to soil cleanup | 300,000 tve_AmountOfSettlementForPotentialLiabilityRelatedToSoilCleanup
Amount of settlement for potential liability related to EPA study of site | 8,000 tve_AmountofsettlementforpotentialliabilityrelatedtoEPAstudyofsite
Remaining cleanup, remediation, and natural resource damages are less than | 1,000,000 tve_RemainingNaturalResourceDamagesAreLessThan
Accrual for Environmental Loss Contingencies, Gross | 12,000,000 us-gaap_AccrualForEnvironmentalLossContingenciesGross
Nuclear [Member] |
Loss Contingencies [Line Items] |
Present value of estimated future decommissioning cost | 2,100,000,000 us-gaap_DecommissioningLiabilityNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = tve_NuclearMember
Non-nuclear [Member] |
Loss Contingencies [Line Items] |
Present value of estimated future decommissioning cost | $ 1,100,000,000 us-gaap_DecommissioningLiabilityNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = tve_NonNuclearMember

X
- Definition The amount of property, decommissioning, and decontamination insurance available for loss at any one site to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
Name: | tve_AmountOfInsuranceAvailableForLossAtAnyOneSite
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of property, decommissioning, and decontamination insurance carried for nuclear plants owned to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
Name: | tve_AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of settlement for potential liability related to the EPA study of site. + References No definition available. + Details
Name: | tve_AmountofsettlementforpotentialliabilityrelatedtoEPAstudyofsite
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the settlement for potential liability related to soil cleanup. + References No definition available. + Details
Name: | tve_AmountOfSettlementForPotentialLiabilityRelatedToSoilCleanup
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition An assessment from licensees for each licensed nuclear reactor in the United States to fund the second layer, the Secondary Financial Program. + References No definition available. + Details
Name: | tve_AssessmentFromLicenseesForEachLicensedReactor
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum amount of retrospective premiums that may be required for property, decommissioning, and decontamination insurance. + References No definition available. + Details
Name: | tve_Maximumamountofretrospectivepremiums
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum assessment per nuclear incident. + References No definition available. + Details
Name: | tve_MaximumAssessmentPerNuclearIncident
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum idemnity per unit if an accident covered by the policy tasks or keeps a nuclear unit offline. + References No definition available. + Details
Name: | tve_MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum payment that would be required per accident in any one year. + References No definition available. + Details
Name: | tve_MaximumPaymentRequiredPerAccidentInAnyOneYear
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The per year per unit limitation of the assessment for any nuclear accident + References No definition available. + Details
Name: | tve_NuclearAccidentAssessmentLimitationPerYearPerUnit
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition For the first layer of protection all NRC nuclear plant licensees purchase nuclear insurance from American Nuclear Insurers for each nuclear plant with an operating license. + References No definition available. + Details
Name: | tve_NuclearLiabilityInsurance
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of licensed nuclear units owned. + References No definition available. + Details
Name: | tve_NumberOfLicensedNuclearUnits
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of licensed reactors in US. + References No definition available. + Details
Name: | tve_NumberoflicensedreactorsinUS
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of procedures for determining estimates for the costs of nuclear decommissioning + References No definition available. + Details
Name: | tve_NumberOfProceduresForDeterminingEstimatesForCostsOfNuclearDecommissioning
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The possible additional future costs for compliance with Clean Air Act requirements. + References No definition available. + Details
Name: | tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Remaining natural resource damages are less than + References No definition available. + Details
Name: | tve_RemainingNaturalResourceDamagesAreLessThan
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of retrospective premiums that could be required for accidental outage insurance. + References No definition available. + Details
Name: | tve_RetrospectivePremiums
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The surcharge for legal expenses. + References No definition available. + Details
Name: | tve_SurchargeForLegalExpenses
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of protection available to compensate for losses arising from a nuclear event in the United States. + References No definition available. + Details
Name: | tve_TotalAmountOfProtectionAvailable
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The U.S. Congress is required to take action to provide additional funds to cover the additional losses if these layes are exhausted. + References No definition available. + Details
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Namespace Prefix: | tve_
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Balance Type: | na
Period Type: | instant

X
- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Definition Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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