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Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 20, 2017 USD ($) | Jul. 20, 2016 USD ($)
Debt Disclosure [Abstract] |  |  |
Leasing transaction, number of units | 24 |  |
Percentage equity interests acquired |  | 100.00% |
Number of Businesses Acquired | 2 |  |
Leaseback obligation settled as a result of acquisition |  | $ 70 | $ 70
Number of combustion units - Leaseback obligation | 8 |  |
CT and QTE outstanding leaseback obligation | $ 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
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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
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Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Leaseback obligation settled as a result of acquisition + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of combustion units - Lease/leaseback + References No definition available. + Details
Name: | tve_NumberofcombustionunitsLeaseleaseback
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
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://www.xbrl.org/2003/role/presentationRef -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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Balance Type: | na
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