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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Derivatives, Fair Value |  |
Derivative, Notional Amount | $ 1,500 |
Forward Contract Derivative Asset, at Fair Value | (2) | $ 2
Gross amounts of recognized liabilities | 1,700 | 1,722
$14 million notional [Member] |  |
Derivatives, Fair Value |  |
Derivative, Notional Amount | 14 |
$28 million notional [Member] |  |
Derivatives, Fair Value |  |
Derivative, Notional Amount | 28 |
200 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Gross amounts of recognized liabilities | 78 | 83
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (35) | (36)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (31) | (32)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (4) | (4)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (43) | (47)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (40) | (44)
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (3)
$1.0 billion notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (1,169) | (1,182)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1,090) | (1,101)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (62) | (44)
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (17) | (37)
$476 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (452) | (455)
$476 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (421) | (423)
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (29) | (22)
$476 million notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (2) | (10)
$42 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (1) | (2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value |  | (1)
$42 million notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value | (1) | (1)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 105 | 247
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 25 | 40
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 86 | 210
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (5) |
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1) | (3)
Fair Value, Inputs, Level 2 |  |
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ (2) | $ 2

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