XML 174 R120.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Commitments and Contingencies Commitments and Contingencies - Legal Proceedings (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 Legal_actions | May 31, 2013 | Apr. 30, 2011 Agreements Groups | Mar. 31, 2010 USD ($) People | Jun. 30, 2008 Legal_actions | Oct. 31, 2007 Legal_actions | Sep. 30, 2016 USD ($) | Dec. 31, 2010 Years | Jun. 30, 2011 USD ($) Units megawatts
Legal Proceedings |  |  |  |  |  |  |  |  |
TDEC civil penalties related to Gallatin |  |  |  |  |  |  | $ 17,000 |  |
Plaintiff civil penalties related to Gallatin |  |  |  |  |  |  | $ 37,500 |  |
Number of reactors a COL was submitted for | Legal_actions |  |  |  |  |  | 2 |  |  |
Number of days the EPA has to respond |  |  |  |  |  |  | 60 |  |
General |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  |  |  |  |  | $ 61,000,000 |  |
Environmental Agreements |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Number of similar environmental agreements entered into | Agreements |  |  | 2 |  |  |  |  |  |
Number of environmental agreements entered into with the EPA | Agreements |  |  | 1 |  |  |  |  |  |
Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee | Agreements |  |  | 1 |  |  |  |  |  |
Number of environmental agreements entered into with environmental advocacy groups | Groups |  |  | 3 |  |  |  |  |  |
Number of units to be idled | Units |  |  |  |  |  |  |  |  | 18
Megawatts option 1 | megawatts |  |  |  |  |  |  |  |  | 2,200
Megawatts option 2 |  |  |  |  |  |  |  |  | 3,500
Amount to be invested in certain environmental projects |  |  |  |  |  |  |  |  | $ 290,000,000
Amount to be provided to fund environmental projects |  |  |  |  |  |  |  |  | 60,000,000
Amount to pay civil penalties |  |  |  |  |  |  |  |  | $ 10,000,000
Case Involving Tennessee Valley Authority Retirement System |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Number of participants that filed suit | People |  |  |  | 8 |  |  |  |  |
Contribution related to TVARS case |  |  |  | $ 1,000,000,000 |  |  |  |  |
Retirement age of eligibility for cost of living adjustment before January 1, 2010 | Years |  |  |  |  |  |  |  | 55 |
Retirement age of eligibility for cost of living adjustment after January 1, 2010 | Years |  |  |  |  |  |  |  | 60 |
Administrative Proceedings Regarding Sequoyah U1 and U2 |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
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 | Legal_actions | 7 |  |  |  |  |  |  |  |
Number of contentions left | Legal_actions | 1 |  |  |  |  |  |  |  |
Administrative Proceedings Regarding Bellefonte Units 3 and 4 |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Number of contentions left | Legal_actions |  |  |  |  | 2 |  |  |  |
Number of admitted contentions submitted by BREDL and SACE | Legal_actions |  |  |  |  | 4 |  |  |  |
Number of contentions submitted by BREDL and SACE | Legal_actions |  |  |  |  | 20 |  |  |  |
Number of contentions no longer admitted | Legal_actions |  |  |  |  | 2 |  |  |  |
Other long-term liabilities | General |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  |  |  |  |  | 18,000,000 |  |
Accounts payable and accrued liabilities | General |  |  |  |  |  |  |  |  |
Legal Proceedings |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  |  |  |  |  | $ 43,000,000 |  |

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 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 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 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 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 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 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 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 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 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 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 the EPA has to respond + References No definition available. + Details
Name: | tve_NumberofdaystheEPAhastorespond
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 The number of reactors for Bellefonte Units 3 and 4 that a CCOLA was submitted to the NRC for approval. + References No definition available. + Details
Name: | tve_NumberofreactorsaCCOLAwassubmittedfor
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
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 The amount per day the plaintiffs in the Gallatin Fossil Plant CCR cases are seeking for violations related to the TN Water Quality Control Act and TN Solid Waste Disposal Act. + References No definition available. + Details
Name: | tve_PlaintiffcivilpenaltiesrelatedtoGallatin
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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 The amount per day TDEC is seeking for each day TVA is found to have violated the statutes related to the TN Water Quality Control Act and TN Solid Waste Disposal Act in relation to Gallatin Fossil Plant. + References No definition available. + Details
Name: | tve_TDECcivilpenaltiesrelatedtoGallatin
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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
- 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 The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationCaseAxis=tve_GeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=tve_EnvironmentalAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=tve_CaseInvolvingTennesseeValleyAuthorityRetirementSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=tve_AdministrativeProceedingsRegardingSequoyahU1andU2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=tve_AdministrativeProceedingsRegardingBellefonteUnits3And4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |