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Risk Management Activities and Derivative Transactions Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022
Derivative
Amount of letters of credit outstanding	$ 6
Forward Contract Derivative Asset, at Fair Value	10		$ 4
Likely cash collateral obligation increase	22
Collateral Paid	100	$ 50	0
Letter of Credit
Derivative
Amount of letters of credit outstanding	569		704
Fair Value, Inputs, Level 2
Derivative
Forward Contract Derivative Asset, at Fair Value	$ 10		$ 4

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- Definition

Collateral Paid

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of forward contract derivative assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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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.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Details

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