XML 85 R52.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions | Sep. 20, 2017 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 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 |  | $ 302 | $ 338 |

X
- 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

X
- 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

X
- 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

X
- 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

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

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

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration