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Commitments and Contingencies Unfunded loan commitments (Details) $ in Millions	Sep. 30, 2023 USD ($)
Other commitments - unfunded loan commitments [Abstract]
2019	$ 1
2020	$ 0

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- Definition

Other commitments - unfunded loan commitments [Abstract]

+ References

No definition available.

+ Details

Name:	tve_OthercommitmentsunfundedloancommitmentsAbstract
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Unfunded loan commitment due in year 2

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No definition available.

+ Details

Name:	tve_Unfundedloancommitmentdueinyear2
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Unfunded loan commitment due in year 3

+ References

No definition available.

+ Details

Name:	tve_Unfundedloancommitmentdueinyear3
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant