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Leaseback Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2003 Units | Mar. 31, 2013 | Sep. 30, 2012
Leaseback Obligations |  |  |
Proceeds prior to 2004 | $ 945 |  |
Number of new peaking combustion turbine units | 24 |  |
Proceeds in 2003 | 389 |  |
CT and QTE outstanding leaseback obligation |  | 780 | 825
SSSL undivided interest |  | 90.00% |
Southaven leaseback obligation |  | $ 370 | $ 378

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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 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 outstanding leaseback obligations. + 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

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- 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

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- 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