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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, 2023
USD ($)
Years
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Years
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Derivative          
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (66,000,000) $ 282,000,000 $ (52,000,000) $ 271,000,000  
Increase (Decrease) in Derivative Assets     388,000,000    
Interest Rate Swap          
Derivative          
Gain (loss) recognized in income on derivatives (11,000,000) (28,000,000) [1] (26,000,000) [1] (57,000,000) [1]  
Amount recognized for unrealized gains (losses)     0    
Fair value (247,000,000)   (247,000,000)   $ (233,000,000)
Commodity Contract Derivatives          
Derivative          
Fair value $ 9,000,000   $ 9,000,000   $ 145,000,000
Natural Gas [Member]          
Derivative          
Number of contracts 44   44   44
Derivative, Nonmonetary Notional Amount 288,000,000   288,000,000   296,000,000
Fair value $ 21,000,000   $ 21,000,000   $ 145,000,000
Commodity Contract under FHP          
Derivative          
Gain (loss) recognized in income on derivatives $ (140,000,000) $ 0 $ (159,000,000) $ 0  
Number of contracts 277   277   225
Derivative, Nonmonetary Notional Amount 396   396   256
Fair value $ (273,000,000)   $ (273,000,000)   $ 115,000,000
Number Commodity Contract Term Years | Years 5   5    
[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, 2023 and for the three and six months ended March 31, 2022.(2) Of the amount recognized for the 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, 2023, $127 million and $32 million were reported in Fuel expense and Purchased power expense, respectively.