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Benefit Plans Amounts Recognized on TVA's Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure    
Regulatory assets $ 6,612 $ 8,698
Non-current regulatory liabilities 104 25
Accounts payable and accrued liabilities (1,982) (1,940)
Pension and post-retirement benefit obligations (4,476) (5,477)
Pension Benefits    
Defined Benefit Plan Disclosure    
Amount capitalized due to actions of regulator 96 42
Regulatory assets 3,119 4,009
Accounts payable and accrued liabilities (6) (4)
Pension and post-retirement benefit obligations [1] (3,716) (4,608)
Other Post-retirement Benefits    
Defined Benefit Plan Disclosure    
Amount capitalized due to actions of regulator 0 0
Regulatory assets   23
Non-current regulatory liabilities 73  
Accounts payable and accrued liabilities (28) (33)
Pension and post-retirement benefit obligations [1] (400) (461)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent    
Defined Benefit Plan Disclosure    
Postemployment benefits liability, noncurrent $ 360 $ 408
[1] The table above excludes $360 million and $408 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, 2018 and 2017, respectively.