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Asset Acquisitions and Business Combinations (Details) $ in Millions	Sep. 20, 2017 USD ($)
Business Combinations and Settlement of Preexisting Relationships [Abstract]
Fair value of liabilities assumed	$ 74

X

- Definition

Business Combinations and Settlement of Preexisting Relationships [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant