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v3.23.3

Commitments and Contingencies Unfunded loan commitments (Details) $ in Millions | Sep. 30, 2023 USD ($)
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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 + References 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