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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 0 |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
FTP transaction limit | 130 |  |  |
Maximum hedge volume | 75.00% |  |  |
Market value limitation of outstanding construction materials hedging transactions | 100 |  |  |
Portfolio value at risk limit for foreign currency transactions | 5 |  |  |
Interest Rate Swap |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | [1] | 0 | [1]
Unrealized losses on investments | 524 |  | (168) |
Commodity Contract Derivatives |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (11) | [1] | (22) | [1]
Fair value | (141) |  | (267) |
Commodity Derivatives Under Financial Trading Program |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (126) | [1] | (342) | [1]
Fair value | (166) | [2] | (228) | [2]
Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Number of contracts | 19 |  | 23 |
Notional amount | 43,000,000 |  | 46,000,000 |
Fair value | (140) |  | (267) |
Natural Gas Contract Derivatives |  |  |  |
Derivative |  |  |  |
Number of contracts | 13 |  | 25 |
Notional amount | 39,000,000 |  | 51,000,000 |
Fair value | (1) |  | 0 |
Futures and options contracts |  |  |  |
Derivative |  |  |  |
Remaining terms | 0 |  |  |
Swap contracts |  |  |  |
Derivative |  |  |  |
Remaining terms | 5 years |  |  |
Maximum | Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Derivative, Term of Contract | 5 years |  |  |
Maximum | Natural Gas Contract Derivatives |  |  |  |
Derivative |  |  |  |
Derivative, Term of Contract | 2 years |  |  |
Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
Fair value | $ 0 |  | $ 0 |
[1] | All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there was no related gain (loss) recognized in income for these unrealized gains (losses) for theyears ended 2013 and 2012.
[2] | The September 30, 2013, and September 30, 2012 balances in the Derivatives Under Financial Trading Program table show all open derivative positions in the FTP.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition FTP transaction limit + References No definition available. + Details
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- Definition The market value limitation of outstanding hedging transactions involving construction materials. + References No definition available. + Details
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