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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2003 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 20, 2017 | Jul. 20, 2016
Lease/Leasebacks [Abstract] |  |  |  |  |
Proceeds prior to 2004 for CTs | $ 945 |  |  |  |
Proceeds in 2003 for QTEs | $ 389 |  |  |  |
Percentage equity interests acquired |  |  |  | 100.00% | 100.00%
Leaseback obligation settled as a result of acquisition |  |  |  | $ 70 | $ 70
CT and QTE outstanding leaseback obligation |  | $ 301 | $ 338 |  |

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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 Lease/Leasebacks [Abstract] + References No definition available. + Details
Name: | tve_LeaseLeasebacksAbstract
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Leaseback obligation settled as a result of acquisition + References No definition available. + Details
Name: | tve_Leasebackobligationsettledasaresultofacquisition
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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