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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 11 | $ 13
Gross amounts of recognized liabilities | 1,977 | 2,250
$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 |  |
Fair value | (60) | (78)
Gross amounts of recognized liabilities | 108 | 209
200 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | 0 | 0
200 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (60) | (78)
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (22) | (63)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (18) | (58)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (4) | (5)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (26) | (68)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (23) | (65)
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 | (1,332) | (1,449)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1,251) | (1,369)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (81) | (43)
$1.0 billion notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value |  | (37)
$476 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (533) | (588)
$476 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (502) | (556)
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (31) | (22)
$476 million notional interest rate swap | Interest payable, current |  |
Derivatives, Fair Value |  |
Fair value |  | (10)
$42 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (4) | (4)
$42 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1) | (2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (2)
Commodity contract derivatives |  |
Derivatives, Fair Value |  |
Fair value | 22 | 46
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 13 | 23
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 12 | 26
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | 0 | 0
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (3)
Fair Value, Inputs, Level 2 |  |
Derivatives, Fair Value |  |
Forward Contract Derivative Asset, at Fair Value | $ 11 | $ 13

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