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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.