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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) | 3 Months Ended |
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Dec. 31, 2022 USD ($) Years | Dec. 31, 2021 USD ($) | Sep. 30, 2022 USD ($)
Derivative |  |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives |  | $ (14,000,000) | $ 11,000,000 |
Interest Rate Swap |  |  |  |
Derivative |  |  |  |
Gain (loss) recognized in income on derivatives | [1] | (15,000,000) | (29,000,000) |
Amount recognized for unrealized gains (losses) |  | 0 |  |
Fair value |  | (218,000,000) |  | $ (233,000,000)
Commodity Contract Derivatives |  |  |  |
Derivative |  |  |  |
Fair value |  | $ 71,000,000 |  | $ 145,000,000
Natural Gas [Member] |  |  |  |
Derivative |  |  |  |
Number of contracts |  | 48 |  | 44
Derivative, Nonmonetary Notional Amount |  | 356,000,000 |  | 296,000,000
Fair value |  | $ 71,000,000 |  | $ 145,000,000
Commodity Contract under FHP |  |  |  |
Derivative |  |  |  |
Gain (loss) recognized in income on derivatives |  | $ (19,000,000) | $ 0 |
Number of contracts |  | 253 |  | 225
Derivative, Nonmonetary Notional Amount |  | 300 |  | 256
Fair value |  | $ (121,000,000) |  | $ 115,000,000
Number Commodity Contract Term Years | Years |  | 5 |  |
Commodity Contract not under FHP |  |  |  |
Derivative |  |  |  |
Number Commodity Contract Term Years | Years |  | 3 |  |
[1] | All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there were no related gains (losses) recognized in income for these unrealized gains (losses) for the three months ended December 31, 2022 and for the three months ended December 31, 2021.(2) Of the amount recognized for the three months ended December 31, 2022, $15 million and $4 million were reported in Fuel expense and Purchased power expense, respectively.

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of interest rate derivatives held at each balance sheet date. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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