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Contingencies and Legal Proceedings Legal Proceedings (Details)	Mar. 31, 2023 Units
Legal Proceedings
Number of licensed nuclear units	7

X

- Definition

The number of licensed nuclear units owned.

+ References

No definition available.

+ Details

Name:	tve_NumberOfLicensedNuclearUnits
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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