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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
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

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

Lease/Leasebacks [Abstract]

+ References

No definition available.

+ Details

Name:	tve_LeaseLeasebacksAbstract
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

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