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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, 2021 USD ($) Years | Jun. 30, 2021 USD ($) | [1] | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($)
Derivative |  |  |  |
Amount recognized for unrealized gains (losses) | $ 0 |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives | (11,000,000) |  | $ 143,000,000 |
Derivative, Notional Amount | 1,500,000,000 |  |  |
Interest Rate Swap |  |  |  |
Derivative |  |  |  |
Gain (loss) recognized in income on derivatives | (29,000,000) | $ (29,000,000) |  |
Fair value | (452,000,000) |  |  | $ (455,000,000)
Commodity Contract Derivatives |  |  |  |
Derivative |  |  |  |
Fair value | $ 105,000,000 |  |  | $ 247,000,000
Natural Gas [Member] |  |  |  |
Derivative |  |  |  |
Number of contracts | 42 |  |  | 40
Derivative, Nonmonetary Notional Amount | 361,000,000 |  |  | 263,000,000
Fair value | $ 105,000,000 |  |  | $ 247,000,000
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, 2021 and 2020.

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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 http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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