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Contingencies and Legal Proceedings Legal Proceedings (Details) | Dec. 31, 2022 Units
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Legal Proceedings |
Number of licensed nuclear units | 7

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- Definition The number of licensed nuclear units owned. + References No definition available. + Details
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Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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