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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($)
Derivative |  |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives | $ (177,000,000) | $ 189,000,000 |  |
Fair value | 32,000,000 |  |  | $ 64,000,000
Interest Rate Swap |  |  |  |
Derivative |  |  |  |
Amount recognized for unrealized gains (losses) | 0 |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (10,000,000) | (8,000,000) | [1] |
Commodity Contract Derivatives |  |  |  |
Derivative |  |  |  |
Number of contracts | 51 |  |  | 45
Derivative, Nonmonetary Notional Amount | 508,000,000 |  |  | 321,000,000
Fair value | $ 6,000,000 |  |  | $ 2,000,000
Derivative, Term of Contract | 11 years |  |  |
Derivative, Term of Contract | 11 years |  |  |
Commodity Contract under FHP |  |  |  |
Derivative |  |  |  |
Number of contracts | 173 |  |  | 126
Derivative, Nonmonetary Notional Amount | 280 |  |  | 230
Fair value | $ (75,000,000) |  |  | $ (161,000,000)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (37,000,000) | $ (54,000,000) |  |
Derivative, Term of Contract | 3 years |  |  |
Derivative, Term of Contract | 3 years |  |  |
[1] | All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there were no related gains (losses) recognized in income for these unrealized gains (losses) for the three months ended December 31, 2024 and for the three months ended December 31, 2023. (2) Of the amount recognized for the three months ended December 31, 2024, $30 million and $7 million were reported in Fuel expense and Purchased power expense, respectively, and of the amount recognized for the three months ended December 31, 2023, $44 million and $10 million were reported in Fuel expense and Purchased power expense, respectively.

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