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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, 2022
USD ($)
Years
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Years
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Derivative          
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (262,000,000) $ 183,000,000 $ (533,000,000) $ (346,000,000)  
Derivative, Notional Amount 1,500,000,000   1,500,000,000    
Interest Rate Swap          
Derivative          
Gain (loss) recognized in income on derivatives (26,000,000) (29,000,000) [1] (83,000,000) [1] (86,000,000) [1]  
Amount recognized for unrealized gains (losses)     0    
Fair value (283,000,000)   (283,000,000)   $ (455,000,000)
Commodity Contract Derivatives          
Derivative          
Fair value $ 183,000,000   $ 183,000,000   $ 247,000,000
Natural Gas [Member]          
Derivative          
Number of contracts 60   60   40
Derivative, Nonmonetary Notional Amount 364,000,000   364,000,000   263,000,000
Fair value $ 183,000,000   $ 183,000,000   $ 247,000,000
Number Commodity Contract Term Years | Years 3   3    
Commodity Contract under FHP          
Derivative          
Gain (loss) recognized in income on derivatives $ 14,000,000 $ 0 $ 14,000,000 $ 0  
Number of contracts 131   131   0
Derivative, Nonmonetary Notional Amount 163   163    
Fair value $ 52,000,000   $ 52,000,000   $ 0
[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, 2022 and for the three and nine months ended June 30, 2021.(2) Amount recognized in 2022 is solely reported in Fuel expense.