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Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions	Sep. 20, 2017 USD ($)	Jun. 30, 2018 USD ($)	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