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Impact of New Accounting Standards and Interpretations
 12 Months Ended
Sep. 30, 2023
Accounting Changes and Error Corrections [Abstract]  
Accounting Standards Update and Change in Accounting Principle [Text Block] Impact of New Accounting Standards and Interpretations
The following accounting standards have been issued but as of September 30, 2023, were not effective and had not been adopted by TVA:

Accounting for Contract Assets and Contract Liabilities from Contracts with Customers
DescriptionThis guidance requires an entity (acquirer) to recognize and measure contract assets and contract
liabilities acquired in a business combination in accordance with revenue with customers. It is
expected that an acquirer will generally recognize and measure acquired contract assets and contract
liabilities in a manner consistent with how the acquiree recognized and measured contract assets and
contract liabilities in the acquiree’s financial statement. The entity should apply the standard prospectively to business combinations occurring on or after the effective date of the standard.
Effective Date for TVAThis new standard is effective for TVA’s interim and annual reporting periods beginning October 1,
2023. TVA adopted the standard on October 1, 2023, on a prospective basis. While early adoption was permitted, TVA did not adopt the standard early.
Effect on the Financial Statements or Other Significant MattersAdoption of this standard did not have a material impact on TVA's financial condition, results of operations, or cash flows.

Troubled Debt Restructurings and Vintage Disclosures
DescriptionThis guidance eliminates the recognition and measurement guidance on troubled debt restructuring for
creditors that have adopted Financial Instruments-Credit Losses and requires enhanced disclosures
about loan modifications for borrowers experiencing financial difficulty. Additionally, the guidance
requires public business entities to present current-period gross write-offs by year of origination in their
vintage disclosures. The entity should apply the standard prospectively except for the transition method related to the recognition and measurement of troubled debt restructuring. For the transition method, an entity has the option to apply a modified retrospective transition method, resulting in a cumulative-effect adjustment to retained earnings in the period of adoption.
Effective Date for TVAThis new standard is effective for TVA’s interim and annual reporting periods beginning October 1,
2023. TVA adopted the standard on October 1, 2023, on a prospective basis. While early adoption was permitted, TVA did not adopt the standard early.
Effect on the Financial Statements or Other Significant MattersAdoption of this standard did not have a material impact on TVA's financial condition, results of operations, or cash flows.