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Summary of Significant Accounting Policies Leases (Details) $ in Millions	Jun. 30, 2020 USD ($)
Lease obligation related to Purchased Power [Line Items]
Lease Obligation Related to Purchased Power Agreements	$ 285

X

- Definition

This is the portion of the total lease obligation related to purchased power agreements.

+ References

No definition available.

+ Details

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

X

- Definition

[Line Items] for Lease obligation related to Purchased Power

+ References

No definition available.

+ Details

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