XML 95 R69.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Contingencies and Legal Proceedings Contingencies (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 reactors | Dec. 31, 2016 Units | Dec. 31, 2016 USD ($) | Dec. 31, 2016 Insurance_layers | Dec. 31, 2016 Procedures | Dec. 31, 2016 Sites | Sep. 30, 2016 USD ($)
Loss Contingencies |  |  |  |  |  |  |  |
Nuclear liability insurance |  |  | $ 375 |  |  |  |  |
Assessment from licensees for each licensed reactor |  |  | 127 |  |  |  |  |
Number of licensed reactors in US | reactors | 102 |  |  |  |  |  |  |
Nuclear accident assessment limitation per year per unit |  |  | 19 |  |  |  |  |
Number of licensed nuclear units | Units |  | 7 |  |  |  |  |  |
Maximum assessment per nuclear incident |  |  | 891 |  |  |  |  |
Maximum payment required per accident in any one year |  |  | 133 |  |  |  |  |
Total amount of protection available |  |  | 13,000 |  |  |  |  |
Surcharge for legal expenses | 5.00% |  |  |  |  |  |  |
Number of layers before Congress is required to take action | Insurance_layers |  |  |  |  | 2 |  |  |
Amount of property, decommissioning, and decontamination insurance carried |  |  | 5,100 |  |  |  |  |
Amount of insurance available for loss at any one site |  |  | 2,100 |  |  |  |  |
Number of sites | 2 |  |  |  |  |  | 1 |
Maximum amount of retrospective premiums |  |  | 132 |  |  |  |  |
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline |  |  | 490 |  |  |  |  |
Maximum retrospective premiums |  |  | 37 |  |  |  |  |
Estimated future decommissioning cost |  |  | 4,081 | [1] |  |  |  | $ 4,052
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures |  |  |  |  |  | 2 |  |
Possible additional future costs for compliance with Clean Air Act requirements |  |  | 335 |  |  |  |  |
Possible additional future costs for compliance with CCR requirements |  |  | 1,200 |  |  |  |  |
Possible additional future costs for compliance with Clean Water requirements. |  |  | 400 |  |  |  |  |
Total amount liability settled for |  |  |  |  |  |  |  | 0
Estimated liability for cleanup and environmental work |  |  | 22 |  |  |  |  | 23
Nuclear |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |
Estimated future decommissioning cost |  |  | 2,521 |  |  |  |  | 2,492
Non-nuclear |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |
Estimated future decommissioning cost |  |  | $ 1,560 |  |  |  |  | $ 1,560
[1] | The current portion of ARO in the amount of $200 million and $212 million is included in Accounts payable and accrued liabilities at December 31, 2016, and September 30, 2016, respectively.

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 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 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 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 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 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 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 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 The possible additional future costs for compliance with CCR requirements + References No definition available. + Details
Name: | tve_PossibleadditionalfuturecostsforcompliancewithCCRrequirements
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The possible additional future costs for compliance with Clean Water requirements. + References No definition available. + Details
Name: | tve_PossibleadditionalfuturecostsforcompliancewithCleanWaterrequirements.
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | tve_USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
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 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
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | tve_ReconciliationOfAssetRetirementObligationLiabilityAxis=tve_NuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | tve_ReconciliationOfAssetRetirementObligationLiabilityAxis=tve_NonNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |