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Commitments and Contingencies Unfunded loan commitments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Legal Proceedings |  |
Unfunded Loan Commitments | $ 3 | $ 18
Energy prepayment obligations |  |
Legal Proceedings |  |
Prepayment Obligations | $ 10 |

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- 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 An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time. + References No definition available. + Details
Name: | tve_UnfundedLoanCommitments
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: |