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Contingencies and Legal Proceedings Legal Proceedings (Details)
 9 Months Ended
Jun. 30, 2022
USD ($)
Agreements
Units
Groups
Legal Proceedings  
Number of licensed nuclear units | Units 7
Amount remaining to be spent under environmental agreements [Abstract] $ 9,000,000
Compensatory damages - Kingston Case 8,000,000
Punitive Damages - Kingston Case 10,000,000
Down payment from Nuclear Development 22,000,000
Compensated costs to Nuclear Development 1,000,000
Other Income $ 28,000,000
Prejudgement Interest Rate 7.50%
Amended Final Judgement Interest Rate 6.00%
General  
Legal Proceedings  
Legal loss contingency accrual $ 11,000,000
Environmental Agreements  
Legal Proceedings  
Number of similar environmental agreements entered into | Agreements 2
Number of environmental agreements entered into with the EPA | Agreements 1
Number of environmental agreements entered into with environmental advocacy groups | Groups 3
Amount to be invested in certain TVA environmental projects $ 290,000,000
Accounts payable and accrued liabilities | General  
Legal Proceedings  
Legal loss contingency accrual $ 30,000,000