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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Derivative          
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (94,000,000) $ 66,000,000 $ (95,000,000) $ (52,000,000)  
Fair value 80,000,000   80,000,000   $ 52,000,000
Increase (Decrease) in Derivative Assets     81,000,000    
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 $ (7,000,000) (11,000,000) [1] $ (15,000,000) [1] (26,000,000) [1]  
Commodity Contract Derivatives          
Derivative          
Number of contracts 33   33   54
Derivative, Nonmonetary Notional Amount 396,000,000   396,000,000   318,000,000
Fair value $ 14,000,000   $ 14,000,000   $ 31,000,000
Commodity Contract under FHP          
Derivative          
Number of contracts 153   153   221
Derivative, Nonmonetary Notional Amount 300   300   388
Fair value $ (267,000,000)   $ (267,000,000)   $ (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 $ (101,000,000) $ (140,000,000) $ (155,000,000) $ (159,000,000)  
[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 and six months ended March 31, 2024 and for the three and six months ended March 31, 2023.
(2) Of the amount recognized for the three months ended March 31, 2024, $83 million and $18 million were reported in Fuel expense and Purchased power expense, respectively, and of the amount recognized for three months ended March 31, 2023, $112 million and $28 million were reported in Fuel expense and Purchased power expense, respectively. Of the amount recognized for the six months ended March 31, 2024, $127 million and $28 million were reported in Fuel expense and Purchased power expense, respectively, and of the amount recognized for six months ended March 31, 2023, $127 million and $32 million were reported in Fuel expense and Purchased power expense, respectively.