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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, 2022 | Sep. 30, 2021
--- | --- | ---
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Gross Liability | $ 53 |
Derivative, Notional Amount | 1,500 |
Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | 12 | $ 7
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (130) | (36)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (123) | (32)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (7) | (4)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (110) | (47)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (105) | (44)
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (5) | (3)
$1.0 billion notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (672) | (1,182)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (630) | (1,101)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (9) | (44)
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (33) | (37)
$476 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (233) | (455)
$476 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (221) | (423)
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (22)
$476 million notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (9) | (10)
$42 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | 0 | (2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value |  | (1)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 145 | 247
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value |  | 40
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 172 | 210
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value |  | (3)
$28 million notional |  |
Derivatives, Fair Value |  |
Derivative, Notional Amount | 28 |
$14 million notional |  |
Derivatives, Fair Value |  |
Derivative, Notional Amount | 14 |
Commodity Contract under FHP |  |
Derivatives, Fair Value |  |
Fair value | 115 | $ 0
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 | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (8) |
Commodity Contract under FHP | Accounts Receivable [Member] |  |
Derivatives, Fair Value |  |
Fair value | 1 |
Commodity Contract not under FHP | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 34 |
Commodity Contract not under FHP | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1) |
Commodity Contract not under FHP | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 118 |
Commodity Contract not under FHP | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | $ (6) |

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