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Summary of Significant Accounting Policies Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Pre-commercial Ops - capitalized revenue	$ 3	$ 0
Pre-commercial Ops - Capitalized Fuel	$ 3

X

- Definition

Pre-commercial Ops - Capitalized Fuel

+ References

No definition available.

+ Details

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

X

- Definition

Pre-commercial Ops - capitalized revenue

+ References

No definition available.

+ Details

Name:	tve_PreCommercialOpsCapitalizedRevenue
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration