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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 4 | $ 11
Fair value | 59 | 52
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (58) | (72)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (53) | (66)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (5) | (6)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (66) | (69)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (63) | (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 | (520) | (499)
$1.0 billion notional interest rate swap | Other current assets |  |
Derivatives, Fair Value |  |
Fair value |  | 1
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (493) | (473)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (22) |
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (5) | (27)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 14 | 31
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 9 | 12
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 9 | 21
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (2) | (1)
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (2) | (1)
Commodity Contract under FHP |  |
Derivatives, Fair Value |  |
Fair value | (177) | (186)
Gross amounts of recognized liabilities | 185 | 212
Commodity Contract under FHP | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (57) | (51)
Commodity Contract under FHP | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (120) | (135)
$476 million notational interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (172) | (159)
$476 million notational interest rate swap | Other current assets |  |
Derivatives, Fair Value |  |
Fair value |  | 3
$476 million notational interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (165) | (154)
$476 million notational interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value |  | (8)
Fair Value, Inputs, Level 2 |  |
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 4 | $ 11

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