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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 20, 2017 | Jul. 20, 2016
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Lease/Leasebacks [Abstract] |  |  |  |
Percentage equity interests acquired |  |  | 100.00% |
Leaseback obligation settled as a result of acquisition |  |  |  | $ 70
CT and QTE outstanding leaseback obligation | $ 223 | $ 263 |  |

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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 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
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant