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Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2003 USD ($) Units | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Debt Disclosure [Abstract] |  |  |
Proceeds prior to 2004 | $ 945 |  |
Leaseback transaction, number of units | Units | 24 |  |
Proceeds in 2003 | $ 389 |  |
CT and QTE outstanding leaseback obligation |  | $ 617 | $ 691

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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 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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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration