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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure      
Regulatory assets $ (6,134) $ (7,956)  
Non-current regulatory liabilities (172) (40)  
Accounts payable and accrued liabilities (2,466) (2,215)  
Pension and post-retirement benefit obligations (3,072) (5,045)  
Postemployment benefits liability, noncurrent 299    
Pension Benefits      
Defined Benefit Plan Disclosure      
Amount capitalized due to actions of regulator 77 91  
Regulatory assets (1,839) (3,636)  
Accounts payable and accrued liabilities (6) (7)  
Pension and post-retirement benefit obligations [1] (2,436) (4,231)  
Other Post-retirement Benefits      
Defined Benefit Plan Disclosure      
Amount capitalized due to actions of regulator 0 0  
Regulatory assets (70) (32)  
Non-current regulatory liabilities (70)    
Accounts payable and accrued liabilities (22) (24)  
Pension and post-retirement benefit obligations [1] (366) (474)  
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent      
Defined Benefit Plan Disclosure      
Postemployment benefits liability, noncurrent $ 270 $ 340 $ 390
[1] The table above excludes $270 million and $340 million of post-employment benefit costs that are recorded in Post-retirement and post-employment benefit obligations on the Consolidated Balance Sheets at September 30, 2022 and 2021, respectively.