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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 ($)
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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

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration