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Revenue Economic Development Incentives (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenues	$ 318	$ 330	$ 328
Unpaid economic incentives	$ (187)	$ (188)

X

- Definition

Paid Economic Incentives

+ References

No definition available.

+ Details

Name:	tve_PaidEconomicIncentives
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Unpaid economic incentives

+ References

No definition available.

+ Details

Name:	tve_UnpaidEconomicIncentives
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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