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Summary of Significant Accounting Policies Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |  |
Pre-commercial Ops - capitalized revenue | $ 0 | $ 0 | $ 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

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