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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure    
Regulatory assets $ 10,245 $ 8,763
Non-current regulatory liabilities (23) 0
Accounts payable and accrued liabilities (1,844) (1,649)
Pension and post-retirement benefit obligations (6,617) (6,181)
Pension Benefits    
Defined Benefit Plan Disclosure    
Amount capitalized due to actions of regulator 110 95
Regulatory assets 5,115 4,731
Accounts payable and accrued liabilities (5) (5)
Pension and post-retirement benefit obligations [1] (5,711) (5,327)
Other Post-retirement Benefits    
Defined Benefit Plan Disclosure    
Amount capitalized due to actions of regulator 0 0
Regulatory assets   25
Non-current regulatory liabilities (78)  
Accounts payable and accrued liabilities (28) (28)
Pension and post-retirement benefit obligations [1] (516) (471)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent    
Defined Benefit Plan Disclosure    
Postemployment benefits liability, noncurrent $ 390 $ 383
[1] The table above excludes $390 million and $383 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, 2020 and 2019, respectively.