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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |  |
Regulatory assets |  | $ (8,047) | $ (9,408) |
Non-current regulatory liabilities |  | (141) | (83) |
Accounts payable and accrued liabilities |  | (3,299) | (2,910) |
Pension and post-retirement benefit obligations |  | (2,183) | (2,887) |
Postemployment benefits liability, noncurrent |  | 233 | 258 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Regulatory assets |  | (1,531) | (1,979) |
Accounts payable and accrued liabilities |  | (9) | (6) |
Pension and post-retirement benefit obligations | [1] | (1,698) | (2,323) |
Other Post-retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Regulatory assets |  | (131) | (81) |
Non-current regulatory liabilities |  | (131) |  |
Accounts payable and accrued liabilities |  | (17) | (20) |
Pension and post-retirement benefit obligations | [1] | (274) | (333) |
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Postemployment benefits liability, noncurrent |  | 208 | 230 | $ 266
Restoration Plan |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Postemployment benefits liability, noncurrent |  | $ 3 | $ 1 |
[1] | The table above excludes $208 million of post-employment benefit costs and $3 million of RP costs at September 30, 2025, and $230 million of post-employment benefit costs and $1 million of RP costs at September 30, 2024 that are recorded in Post-retirement and post-employment benefit obligations on the Consolidated Balance Sheets.

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