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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2003	Sep. 30, 2018	Sep. 30, 2017	Sep. 20, 2017	Jul. 20, 2016
Lease/Leasebacks [Abstract]
Proceeds prior to 2004 for CTs	$ 945
Proceeds in 2003 for QTEs	$ 389
Percentage equity interests acquired				100.00%	100.00%
Leaseback obligation settled as a result of acquisition				$ 70	$ 70
CT and QTE outstanding leaseback obligation		$ 301	$ 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

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

Proceeds received from entering into a leaseback transaction for qualified technological equipment and software in 2003.

+ References

No definition available.

+ Details

Name:	tve_ProceedsIn2003
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Proceeds received prior to 2004 by entering into leaseback transactions for 24 new peaking combustion turbine units.

+ References

No definition available.

+ Details

Name:	tve_ProceedsPriorTo2004
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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