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Summary of Significant Accounting Policies General and Basis of Presentation (Details) $ in Millions	Jun. 30, 2023 People	Sep. 30, 2022 USD ($)
Accounting Policies [Abstract]
Population of TVA's service area | People	10
Appropriation-investment power program | $		$ 1,000

X

- Definition

The population of the company's service area.

+ References

No definition available.

+ Details

Name:	tve_PopulationOfServiceArea
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The remaining appropriation investment if no additional appropriations from Congress are received.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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