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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, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Derivative      
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (189,000,000) $ 14,000,000  
Fair value 98,000,000   $ 52,000,000
Increase (Decrease) in Derivative Assets 123,000,000    
Interest Rate Swap      
Derivative      
Amount recognized for unrealized gains (losses) 0    
Interest Rate Swap | Other Regulatory Assets (Liabilities)      
Derivative      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (8,000,000) (15,000,000) [1]  
Commodity Contract Derivatives      
Derivative      
Number of contracts 45   54
Derivative, Nonmonetary Notional Amount 366,000,000   318,000,000
Fair value $ 29,000,000   $ 31,000,000
Derivative, Term of Contract 2 years    
Derivative, Term of Contract 2 years    
Commodity Contract under FHP      
Derivative      
Number of contracts 206   221
Derivative, Nonmonetary Notional Amount 351   388
Fair value $ (309,000,000)   $ (186,000,000)
Derivative, Term of Contract 4 years    
Derivative, Term of Contract 4 years    
Commodity Contract under FHP | Other Regulatory Assets (Liabilities)      
Derivative      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (54,000,000) $ (19,000,000)  
[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, 2023 and for the three months ended December 31, 2022.
(2) 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. Of the amount recognized for three months ended December 31, 2022, $15 million and $4 million were reported in Fuel expense and Purchased power expense, respectively.