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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Derivatives, Fair Value |  |  |
Gross amounts of recognized liabilities | $ 1,708 | $ 1,293 |
200 million Sterling currency swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (80) | (67) |
Gross amounts of recognized liabilities | 170 | 94 | [1]
200 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (75) | (62) |
200 million Sterling currency swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (5) | (5) |
250 million Sterling currency swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (44) | (12) |
250 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (39) | (7) |
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (5) | (5) |
150 million Sterling currency swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (46) | (15) |
150 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (43) | (12) |
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 | (1,107) | (878) |
$1.0 billion notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (1,047) | (822) |
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (60) | (56) |
$476 million notional interest rate swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (425) | (317) |
$476 million notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (403) | (297) |
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (22) | (20) |
$42 million notional interest rate swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (6) | (4) |
$42 million notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (4) | (3) |
$42 million notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (2) | (1) |
Commodity contract derivatives |  |  |
Derivatives, Fair Value |  |  |
Fair value | (22) | 60 |
Commodity contract derivatives | Other long-term assets |  |  |
Derivatives, Fair Value |  |  |
Fair value | 6 | 31 |
Commodity contract derivatives | Other current assets |  |  |
Derivatives, Fair Value |  |  |
Fair value | 14 | 41 |
Commodity contract derivatives | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (9) | (8) |
Commodity contract derivatives | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | $ (33) | $ (4) |
[1] | Letters of credit of approximately $1.1 billion and $921 million were posted as collateral at June 30, 2019, and September 30, 2018, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.

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