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Contingencies and Legal Proceedings Legal Proceedings (Details) | 6 Months Ended
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Mar. 31, 2022 USD ($) Agreements Units Groups
Legal Proceedings |
Number of licensed nuclear units | Units | 7
Amount remaining to be spent under environmental agreements [Abstract] | $ 10,000,000
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
General |
Legal Proceedings |
Legal loss contingency accrual | $ 12,000,000
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
Other long-term liabilities | General |
Legal Proceedings |
Legal loss contingency accrual | 11,000,000
Accounts payable and accrued liabilities | General |
Legal Proceedings |
Legal loss contingency accrual | 30,000,000
Other Current Liabilities | General |
Legal Proceedings |
Legal loss contingency accrual | $ 1,000,000

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