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Contingencies and Legal Proceedings Contingencies (Details) (USD $)
 3 Months Ended
Dec. 31, 2014
reactors
Insurance_layers
Sites
Units
Loss Contingencies [Line Items]  
Nuclear liability insurance $ 375,000,000tve_NuclearLiabilityInsurance
Number of sites 1tve_NumberOfSites
Assessment from licensees for each licensed reactor 127,000,000tve_AssessmentFromLicenseesForEachLicensedReactor
Number of licensed reactors in US 104tve_NumberoflicensedreactorsinUS
Nuclear accident assessment limitation per year per unit 19,000,000tve_NuclearAccidentAssessmentLimitationPerYearPerUnit
Number of licensed nuclear units 6tve_NumberOfLicensedNuclearUnits
Maximum assessment per nuclear incident 764,000,000tve_MaximumAssessmentPerNuclearIncident
Maximum payment required per accident in any one year 114,000,000tve_MaximumPaymentRequiredPerAccidentInAnyOneYear
Total amount of protection available 13,000,000,000tve_TotalAmountOfProtectionAvailable
Surcharge for legal expenses 5.00%tve_SurchargeForLegalExpenses
The U.S. Congress is required to take action if these layes are exhausted 2tve_USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted
Amount of property, decommissioning, and decontamination insurance carried 5,100,000,000tve_AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried
Amount of insurance available for loss at any one site 2,100,000,000tve_AmountOfInsuranceAvailableForLossAtAnyOneSite
Maximum amount of retrospecitve premiums 120,000,000tve_Maximumamountofretrospectivepremiums
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000,000tve_MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline
Retrospective premiums 35,000,000tve_RetrospectivePremiums
Possible additional future costs for compliance with Clean Air Act requirements 1,100,000,000tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements
Accrual for Environmental Loss Contingencies, Gross 14,000,000us-gaap_AccrualForEnvironmentalLossContingenciesGross
Nuclear [Member]  
Loss Contingencies [Line Items]  
Present value of future decommissioning cost 2,100,000,000us-gaap_DecommissioningLiabilityNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= tve_NuclearMember
Non-nuclear [Member]  
Loss Contingencies [Line Items]  
Present value of future decommissioning cost $ 1,100,000,000us-gaap_DecommissioningLiabilityNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= tve_NonNuclearMember