XML 85 R65.htm IDEA: XBRL DOCUMENT v3.22.4

Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022
Sale Leaseback Transaction [Line Items]
CT and QTE outstanding leaseback obligation	$ 0
Leasing transaction, number of units				16
Leasing transaction, number of units				16
CT and QTE outstanding leaseback obligation	0
Lagoon Creek
Sale Leaseback Transaction [Line Items]
Amortization of reacquired rights	1
Lagoon Creek | Forecast
Sale Leaseback Transaction [Line Items]
Amortization of reacquired rights		$ 3	$ 2
Kemper/Lagoon Creek leasehold interests
Sale Leaseback Transaction [Line Items]
leasehold interest	155
leasehold interest	155
Lagoon Creek
Sale Leaseback Transaction [Line Items]
leasehold interest	78
leasehold interest	$ 78
Kemper/Lagoon Creek leasehold interests
Sale Leaseback Transaction [Line Items]
Leasing transaction, number of units				8
Leasing transaction, number of units				8

X

- Definition

Amortization of reacquired rights

+ References

No definition available.

+ Details

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

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

leasehold interest

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleLeasebackTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	tve_ReacquiredRightsAxis=tve_LagoonCreekMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=tve_KemperLagoonCreekLeaseholdInterestsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=tve_LagoonCreekMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	tve_RemainingUnitsAxis=tve_KemperLagoonCreekLeaseholdInterestsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: