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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 $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Derivative |  |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives | $ (149,000,000) |  | $ 524,000,000 |
Amount of gain (loss) recognized in income on derivatives | (57,000,000) |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
FTP transaction limit | 130,000,000 |  |  |
Maximum hedge volume | 75.00% |  |  |
Market value limitation of outstanding construction materials hedging transactions | 100,000,000 |  |  |
Portfolio value at risk limit for foreign currency transactions | 5,000,000 |  |  |
Interest Rate Swap |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | [1] | 0 | [1]
Commodity Contract Derivatives |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (64,000,000) |  | (11,000,000) |
Fair value | (96,000,000) |  | (141,000,000) |
Commodity Derivatives Under Financial Trading Program |  |  |  |
Derivative |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (43,000,000) |  | (126,000,000) |
Fair value | (103,000,000) | [2] | (166,000,000) | [2]
Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Number of contracts | 24 |  | 19 |
Notional amount | 31,000,000 |  | 43,000,000 |
Fair value | (86,000,000) |  | (140,000,000) |
Natural Gas |  |  |  |
Derivative |  |  |  |
Number of contracts | 46 |  | 13 |
Notional amount | 62,000,000 |  | 39,000,000 |
Fair value | (10,000,000) |  | (1,000,000) |
Maximum | Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Derivative, Term of Contract | 3 years |  |  |
Maximum | Natural Gas |  |  |  |
Derivative |  |  |  |
Derivative, Term of Contract | 2 years |  |  |
Coal Contract Derivatives |  |  |  |
Derivative |  |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
Fair value | $ 0 |  | $ 0 |
[1] | Generally, TVA maintains a level of outstanding discount notes equal to or greater than the notional amount of the interest rate swaps. However, in September 2014 TVA issued long-term Bonds in anticipation of the maturity of other long-term debt, and used the proceeds to pay down discount notes, which caused the balance of discount notes outstanding at September 30, 2014, to fall below the notional amount of the interest rate swaps. There is no impact on the statements of operations due to the use of regulatory accounting for these items.
[2] | Fair values of certain derivatives under the FTP that were in net liability positions totaling $69 million and $100 million at September 30, 2014 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 futures commission merchant 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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