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Summary of Significant Accounting Policies - Pre-commercial Plant Ops (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue capitalized during pre-commercial operations	$ 3	$ 0	$ 0
Fuel capitalized during pre-commercial ops	$ 3

X

- Definition

Fuel capitalized during pre-commercial ops

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No definition available.

+ Details

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Period Type:	duration

X

- Definition

Revenue capitalized during pre-commercial operations

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No definition available.

+ Details

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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.

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No definition available.

+ Details

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