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Risk Management Activities and Derivative Transactions Derivative Instruments That Receive Hedge Accounting Treatment (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Summary of Derivative Instruments That Receive Hedge Accounting Treatment |  |  |
Reclassification to earnings from cash flow hedges in the next 12 months | $ (11) |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax | (37) | $ 19 | [1]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax | (19) | 20 |
Commodity Contract under FHP |  |  |
Summary of Derivative Instruments That Receive Hedge Accounting Treatment |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (37) | (54) |
Fuel Expense | Commodity Contract under FHP |  |  |
Summary of Derivative Instruments That Receive Hedge Accounting Treatment |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (30) | 44 |
Purchased Power Expense | Commodity Contract under FHP |  |  |
Summary of Derivative Instruments That Receive Hedge Accounting Treatment |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (7) | $ 10 |
[1] | There were no amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $11 million of gains from Accumulated other comprehensive income (loss) ("AOCI") to Interest expense within the next 12 months to offset amounts anticipated to be recorded in Interest expense related to the forecasted exchange loss on the debt.

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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