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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) Years | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Years | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Derivative |  |  |  |  |  |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives | $ (262,000,000) | $ 183,000,000 |  | $ (533,000,000) |  | $ (346,000,000) |  |
Derivative, Notional Amount | 1,500,000,000 |  |  | 1,500,000,000 |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | (26,000,000) | (29,000,000) | [1] | (83,000,000) | [1] | (86,000,000) | [1] |
Amount recognized for unrealized gains (losses) |  |  |  | 0 |  |  |  |
Fair value | (283,000,000) |  |  | (283,000,000) |  |  |  | $ (455,000,000)
Commodity Contract Derivatives |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Fair value | $ 183,000,000 |  |  | $ 183,000,000 |  |  |  | $ 247,000,000
Natural Gas [Member] |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of contracts | 60 |  |  | 60 |  |  |  | 40
Derivative, Nonmonetary Notional Amount | 364,000,000 |  |  | 364,000,000 |  |  |  | 263,000,000
Fair value | $ 183,000,000 |  |  | $ 183,000,000 |  |  |  | $ 247,000,000
Number Commodity Contract Term Years | Years | 3 |  |  | 3 |  |  |  |
Commodity Contract under FHP |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | $ 14,000,000 | $ 0 |  | $ 14,000,000 |  | $ 0 |  |
Number of contracts | 131 |  |  | 131 |  |  |  | 0
Derivative, Nonmonetary Notional Amount | 163 |  |  | 163 |  |  |  |
Fair value | $ 52,000,000 |  |  | $ 52,000,000 |  |  |  | $ 0
[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 and nine months ended June 30, 2022 and for the three and nine months ended June 30, 2021.(2) Amount recognized in 2022 is solely reported in Fuel expense.

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