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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 12 Months Ended
Mar. 31, 2022
USD ($)
Years
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Years
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Derivative            
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (282,000,000)   $ 386,000,000 $ (271,000,000) $ (529,000,000)  
Derivative, Notional Amount 1,500,000,000     1,500,000,000    
Interest Rate Swap            
Derivative            
Gain (loss) recognized in income on derivatives (28,000,000) $ (28,000,000) [1]   (57,000,000) [1] $ (57,000,000) [1]  
Amount recognized for unrealized gains (losses)       0    
Fair value (373,000,000) (455,000,000)   (373,000,000)   $ (455,000,000)
Commodity Contract Derivatives            
Derivative            
Fair value $ 202,000,000 $ 247,000,000   $ 202,000,000   $ 247,000,000
Natural Gas [Member]            
Derivative            
Number of contracts 29 40   29   40
Derivative, Nonmonetary Notional Amount 299,000,000 263,000,000   299,000,000   263,000,000
Fair value $ 202,000,000 $ 247,000,000   $ 202,000,000   $ 247,000,000
Number Commodity Contract Term Years | Years 3     3    
Commodity Contract under FHP            
Derivative            
Amount recognized for unrealized gains (losses)       $ 52,000,000   $ 0
Number of contracts 50 0   50   0
Derivative, Nonmonetary Notional Amount 79     79    
Fair value $ 52,000,000 $ 0   $ 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 six months ended March 31, 2022 and 2021.(2) For the three and six months ended March 31, 2022 and 2021, there were no realized gains or losses recognized for the commodity derivatives under the FHP.