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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Lease/Leasebacks [Abstract]
CT and QTE outstanding leaseback obligation	$ 25	$ 223

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- Definition

The outstanding leaseback obligations related to combustion turbine units and qualified technological equipment and software.

+ References

No definition available.

+ Details

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

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- Definition

Lease/Leasebacks [Abstract]

+ References

No definition available.

+ Details

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