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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Years
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Years
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Derivative          
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (85,000,000) $ 262,000,000 $ (33,000,000) $ 533,000,000  
Fair value 78,000,000   78,000,000   $ 1,000,000
Increase (Decrease) in Derivative Assets     362,000,000    
Interest Rate Swap          
Derivative          
Gain (loss) recognized in income on derivatives (10,000,000) (26,000,000) [1] (36,000,000) [1] (83,000,000) [1]  
Amount recognized for unrealized gains (losses)     0    
Fair value (218,000,000)   (218,000,000)   (233,000,000)
Commodity Contract Derivatives          
Derivative          
Fair value $ 11,000,000   $ 11,000,000   $ 145,000,000
Natural Gas [Member]          
Derivative          
Number of contracts 64   64   44
Derivative, Nonmonetary Notional Amount 337,000,000   337,000,000   296,000,000
Fair value $ 18,000,000   $ 18,000,000   $ 145,000,000
Commodity Contract under FHP          
Derivative          
Gain (loss) recognized in income on derivatives $ (97,000,000) $ 14,000,000 $ (256,000,000) $ 14,000,000  
Number of contracts 303   303   225
Derivative, Nonmonetary Notional Amount 420   420   256
Fair value $ (247,000,000)   $ (247,000,000)   $ 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 nine months ended June 30, 2023 and for the three and nine months ended June 30, 2022.(2) Of the amount recognized for the three months ended June 30, 2023, $78 million and $19 million were reported in Fuel expense and Purchased power expense, respectively. Of the amount recognized for nine months ended June 30, 2023, $205 million and $51 million were reported in Fuel expense and Purchased power expense, respectively. Amounts recognized in 2022 were solely reported in Fuel expense.