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Risk Management Activities and Derivative Transactions Mark-to-Market Values of TVA Derivatives (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
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200 million Sterling currency swap | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | $ (37) |  | $ (23) |
250 million Sterling currency swap | Other long-term assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | 14 |  | 21 |
150 million Sterling currency swap | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (26) |  | (31) |
$1.0 billion notional interest rate swap | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (1,101) |  | (1,247) |
$476 million notional interest rate swap | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (393) |  | (458) |
$42 million notional interest rate swap | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (16) |  | (18) |
Coal Contract Derivatives |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (148) |  | (267) |
Commodity contract derivatives | Other long-term assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | 2 |  | 107 |
Commodity contract derivatives | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (52) |  | (205) |
Commodity contract derivatives | Other current assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | 5 |  | 12 |
Commodity contract derivatives | Accounts payable and accrued liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (103) |  | (181) |
Margin cash account | Other current assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | 19 | [1] | 43 | [1]
Derivatives Under FTP |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (161) | [2] | (229) | [2]
Derivatives Under FTP | Other long-term assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | 1 |  | 2 |
Derivatives Under FTP | Other long-term liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (41) |  | (60) |
Derivatives Under FTP | Other current assets |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | (82) |  | (104) |
Derivatives Under FTP | Accounts payable and accrued liabilities |  |  |  |
Derivatives, Fair Value |  |  |  |
Fair value | $ (39) |  | $ (67) |
[1] | In accordance with certain credit terms, TVA uses leverage to trade financial instruments under the FTP. Therefore, the margin cash account balance does not represent 100 percent of the net market value of the derivative positions outstanding as shown in the Derivatives Under Financial Trading Program table.
[2] |

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