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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, 2018 | Sep. 30, 2017
--- | --- | ---
Derivatives, Fair Value |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 1,293 | $ 1,619 |
Other Credit Derivatives [Member] | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value |  | 0 |
Other Credit Derivatives [Member] | Other current assets |  |  |
Derivatives, Fair Value |  |  |
Derivative Liability, Fair Value, Gross Liability | 0 | 4 |
Fair value |  | (4) |
Other Credit Derivatives [Member] | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value |  | (1) |
200 million Sterling currency swap |  |  |
Derivatives, Fair Value |  |  |
Derivative Liability, Fair Value, Gross Liability | 94 | 103 | [1]
Fair value | (67) | (67) |
200 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (62) | (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 | (12) | (15) |
250 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (7) | (11) |
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (5) | (4) |
150 million Sterling currency swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (15) | (21) |
150 million Sterling currency swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (12) | (19) |
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (3) | (2) |
$1.0 billion notional interest rate swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (878) | (1,093) |
$1.0 billion notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (822) | (1,027) |
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (56) | (66) |
$476 million notional interest rate swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (317) | (410) |
$476 million notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (297) | (385) |
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (20) | (25) |
$42 million notional interest rate swap |  |  |
Derivatives, Fair Value |  |  |
Fair value | (4) | (8) |
$42 million notional interest rate swap | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (3) | (6) |
$42 million notional interest rate swap | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (1) | (2) |
Commodity contract derivatives |  |  |
Derivatives, Fair Value |  |  |
Fair value | 60 | (60) |
Commodity contract derivatives | Other long-term assets |  |  |
Derivatives, Fair Value |  |  |
Fair value | 41 | 2 |
Commodity contract derivatives | Other long-term liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (8) | (9) |
Commodity contract derivatives | Other current assets |  |  |
Derivatives, Fair Value |  |  |
Fair value | 31 | 8 |
Commodity contract derivatives | Accounts payable and accrued liabilities |  |  |
Derivatives, Fair Value |  |  |
Fair value | (4) | (61) |
Other Contract |  |  |
Derivatives, Fair Value |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 5 |
Fair value | $ 0 | $ (5) |
[1] | Letters of credit of approximately $921 million and $1.2 billion were posted as collateral at September 30, 2018 and 2017, 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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