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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Derivatives, Fair Value |  |
Amount of letters of credit outstanding | $ 6 |
Fair value | 64 | $ 52
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (49) | (72)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (45) | (66)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (4) | (6)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (67) | (69)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (64) | (65)
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (4)
$1.0 billion notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (622) | (499)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (586) | (473)
$1.0 billion notional interest rate swap | Other current assets |  |
Derivatives, Fair Value |  |
Fair value |  | 1
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (26) | (27)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 2 | 31
Commodity contract derivatives | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value |  |
Fair value | 2 | 12
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (2) | (1)
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 5 | 21
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (1)
$14 million notional |  |
Derivatives, Fair Value |  |
Fair value | (218) | (159)
$14 million notional | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (206) | (154)
$14 million notional | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (9) | (8)
Commodity Contract under FHP |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Gross Liability | 165 | 212
Fair value | (161) | (186)
Commodity Contract under FHP | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (62) | (51)
Commodity Contract under FHP | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | $ (99) | $ (135)

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