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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure      
Regulatory assets $ 7,956 $ 10,245  
Non-current regulatory liabilities (40) (23)  
Accounts payable and accrued liabilities (2,215) (1,844)  
Pension and post-retirement benefit obligations (5,045) (6,617)  
Pension Benefits      
Defined Benefit Plan Disclosure      
Amount capitalized due to actions of regulator 91 110  
Regulatory assets 3,636 5,115  
Accounts payable and accrued liabilities (7) (5)  
Pension and post-retirement benefit obligations [1] (4,231) (5,711)  
Other Post-retirement Benefits      
Defined Benefit Plan Disclosure      
Amount capitalized due to actions of regulator 0 0  
Regulatory assets 32 78  
Non-current regulatory liabilities (32)    
Accounts payable and accrued liabilities (24) (28)  
Pension and post-retirement benefit obligations [1] (474) (516)  
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent      
Defined Benefit Plan Disclosure      
Postemployment benefits liability, noncurrent $ 340 $ 390 $ 419
[1] The table above excludes $340 million and $390 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, 2021 and 2020, respectively.