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Commitments and Contingencies Unfunded loan commitments (Details) $ in Millions	Sep. 30, 2020 USD ($)
Legal Proceedings
2018	$ 1
Energy prepayment obligations
Legal Proceedings
Prepayment Obligations	$ 10

X

- Definition

Prepayment Obligations

+ References

No definition available.

+ Details

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

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- Definition

Unfunded loan commitment due in next twelve months

+ References

No definition available.

+ Details

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

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

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- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=tve_EnergyprepaymentobligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: