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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013
Derivative |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 0 |  |  |  |  |
Unrealized gain (loss) on derivatives | 0 |  | 0 |  |  |
Interest Rate Swap |  |  |  |  |  |
Derivative |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | [1] | 0 | [1] |  |
Unrealized gains (losses) on investments | 138,000,000 |  | 114,000,000 |  |  |
Commodity Contract Derivatives |  |  |  |  |  |
Derivative |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | [1] | 0 | [1] |  |
Fair value | (146,000,000) |  |  |  | (141,000,000) |
Commodity derivatives under the financial trading program |  |  |  |  |  |
Derivative |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (20,000,000) | [1] | (45,000,000) | [1] |  |
Fair value | (132,000,000) | [2] |  |  | (166,000,000) | [2]
Coal Contract Derivatives |  |  |  |  |  |
Derivative |  |  |  |  |  |
Number of contracts | 18 |  |  |  | 19 |
Notional amount | 41,000,000 |  |  |  | 43,000,000 |
Fair value | (145,000,000) |  |  |  |  |
Natural gas contract derivatives |  |  |  |  |  |
Derivative |  |  |  |  |  |
Number of contracts | 8 |  |  |  | 13 |
Notional amount | 23,000,000 |  |  |  | 39,000,000 |
Fair value | $ (1,000,000) |  |  |  | $ (1,000,000) |
Maximum | Coal Contract Derivatives |  |  |  |  |  |
Derivative |  |  |  |  |  |
Derivative, Term of Contract | 4 years |  |  |  |  |
Maximum | Natural gas contract derivatives |  |  |  |  |  |
Derivative |  |  |  |  |  |
Derivative, Term of Contract | 1 year |  |  |  |  |
[1] | All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in incomebut 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 the three months ended December 31, 2013, and 2012.
[2] | Fair values of certain derivatives under the FTP that were in net liability positions totaling $83 million and $100 million at December 31, 2013 and September 30, 2013, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants and cash deposits have been posted to the margin cash accounts held with each FCM to offset the net liability positions in full.

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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 Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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