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Leaseback Obligations Leaseback Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2003 Units | Aug. 09, 2013 | Sep. 30, 2012 | Nov. 29, 2011 Agencies
Leaseback Obligations |  |  |  |  |
Proceeds prior to 2004 |  | $ 945 |  |  |
Number of new peaking combustion turbine units in leaseback transactions |  | 24 |  |  |
Proceeds in 2003 |  | 389 |  |  |
CT/QTE outstanding leaseback obligation | 761 |  |  | 825 |
SSSL's former ownership interest |  |  | 90.00% |  |
Outstanding Southaven leaseback obligation |  |  | 364 |  |
Lease term |  |  | 20 years |  |
Seven States Return | $ 9 |  |  |  |
Number of credit rating agencies |  |  |  |  | 1

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- Definition The outstanding leaseback obligations related to combustion turbine units and qualified technological equipment and software. + References No definition available. + Details
Name: | tve_CtAndQteOutstandingLeasebackObligation
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total amount of future semi-annaul cash distributions declared to profits interest-holder of limited liability company (LLC). + References No definition available. + Details
Name: | tve_FuturedistributiontoBeMadetoLimitedLiabilityCompanyLLCMemberCashDistributions
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of units involved in leaseback transactions. + References No definition available. + Details
Name: | tve_LeasebackTransactionNumberOfUnits
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The term of the lease. + References No definition available. + Details
Name: | tve_LeaseTerm
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The outstanding leaseback obligation related to Southaven. + References No definition available. + Details
Name: | tve_OutstandingSouthavenLeasebackObligation
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proceeds received from entering into a leaseback transaction for qualified technological equipment and software in 2003. + References No definition available. + Details
Name: | tve_ProceedsIn2003
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds received prior to 2004 by entering into leaseback transactions for 24 new peaking combustion turbine units. + References No definition available. + Details
Name: | tve_ProceedsPriorTo2004
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition SSSL's ownership interest in the combined cycle combustion turbine facility in Southhaven, Mississippi. + References No definition available. + Details
Name: | tve_SsslsOwnershipInterest
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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