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Impact of New Accounting Standards and Interpretations (Text Block) | 6 Months Ended
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Mar. 31, 2025
Accounting Changes and Error Corrections [Abstract] |
Accounting Standards Update and Change in Accounting Principle | Impact of New Accounting Standards and Interpretations The following accounting standards or rules have been issued but as of March 31, 2025, were not effective and have not been adopted by TVA:
Improvements to Reportable Segment Disclosures
Description | This guidance improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The amendment requires a public entity to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit and loss. It also requires a public entity that has a single reportable segment to provide all of the disclosures required by the amendment and all existing segment disclosures. The amendment is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods in fiscal years beginning after December 15, 2024. Upon adoption, a public entity should apply the amendments retrospectively to all prior periods presented in the financial statements.
Effective Date for TVA | Annual disclosures to be adopted for the fiscal year ending September 30, 2025 and interim period disclosures to be adopted beginning October 1, 2025.
Effect on the Financial Statements or Other Significant Matters | The adoption of this standard will result in TVA including the additional required disclosures, and TVA does not expect an impact on its financial condition, results of operations, or cash flows.
Enhancement and Standardization of Climate-Related Disclosures for Investors
Description | In March 2024, the SEC adopted its climate-related final rule (SEC Release No. 34-99678, The Enhancement and Standardization of Climate-Related Disclosures for Investors). In April 2024, the SEC voluntarily stayed the new rule as a result of pending legal challenges, and in March 2025, the SEC withdrew its legal defense of the rule. The new rule, if implemented as adopted, will require registrants to provide certain climate-related information in their annual reports and registration statements and will also require the dollar impact of severe weather events and other natural conditions, as well as amounts related to carbon offsets and renewable energy credits or certificates, to be disclosed in the audited financial statements in certain circumstances. If the new rule is implemented as adopted, the disclosure requirements will begin phasing in for fiscal years beginning on or after January 1, 2027 for non-accelerated filers.
Effective Date for TVA | Fiscal year beginning October 1, 2027.
Effect on the Financial Statements or Other Significant Matters | TVA is currently evaluating the impact of the rule on its disclosures.
Disaggregation of Income Statement Expenses
Description | This guidance improves the disclosures about a public entity's expenses in the notes to financial statements and requires disclosure of specified information about certain costs and expenses. The amendment requires a public entity to disclose, on an annual and interim basis, purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depletion for each income statement line item that contains those expenses. Specified expenses, gains, or losses that are already disclosed under existing US GAAP are required to be included in the disaggregated income statement expense line item disclosures, and any relevant remaining amounts need to be described qualitatively. Separate disclosures of total selling expenses and an entity’s definition of those expenses are also required. The amendment is effective for public entities for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Upon adoption, a public entity can apply the amendments prospectively or apply them retrospectively to all prior periods presented in the financial statements.
Effective Date for TVA | Fiscal year beginning October 1, 2027, and interim periods beginning October 1, 2028.
Effect on the Financial Statements or Other Significant Matters | The adoption of this standard will result in TVA including the additional required disclosures, and TVA does not expect an impact on its financial condition, results of operations, or cash flows.

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