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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 8 | $ 4
Fair value | 78 | 1
Gross amounts of recognized liabilities | 1,256 | 1,160
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (80) | (130)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (75) | (123)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (5) | (7)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (81) | (110)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (78) | (105)
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (5)
$1.0 billion notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (619) | (672)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (594) | (630)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (19) | (9)
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (6) | (33)
$476 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (218) | (233)
$476 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (211) | (221)
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (6) | (3)
$476 million notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value |  | (9)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 11 | 145
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 1 | 34
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 21 | 172
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1) | (1)
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (10) | (6)
Commodity Contract under FHP |  |
Derivatives, Fair Value |  |
Fair value | (247) | 115
Commodity Contract under FHP | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value |  | 68
Commodity Contract under FHP | Other current assets |  |
Derivatives, Fair Value |  |
Fair value |  | 54
Commodity Contract under FHP | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (77) |
Commodity Contract under FHP | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (170) | (8)
Commodity Contract under FHP | Accounts Receivable [Member] |  |
Derivatives, Fair Value |  |
Fair value |  | 1
Commodity Contract not under FHP | Other current assets |  |
Derivatives, Fair Value |  |
Fair value |  | 118
Fair Value, Inputs, Level 2 |  |
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 8 | $ 4

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