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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2014 USD ($)
Derivative |  |  |  |  |  |  |  |
Change in Unrealized gains (losses) on Interest Rate Derivatives |  | $ 278,000,000 | $ (65,000,000) |  | $ (71,000,000) | $ (90,000,000) |  |
Amount of gain (loss) recognized in income on derivatives |  | 0 |  |  | 0 |  |  |
Unrealized gain (loss) on derivatives |  | 0 | 0 |  | 0 | 0 |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives | [1] | 0 | 0 |  | 0 | 0 |  |
Commodity Contract Derivatives |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives |  | 0 | 0 | [1] | 0 | 0 | [1] |
Fair value |  | (125,000,000) |  |  | (125,000,000) |  |  | $ (96,000,000)
Commodity derivatives under the financial trading program |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives |  | (30,000,000) | $ (6,000,000) | [1] | (69,000,000) | $ (29,000,000) | [1] |
Fair value | [2] | $ (125,000,000) |  |  | $ (125,000,000) |  |  | $ (103,000,000)
Coal Contract Derivatives |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of contracts |  | 13 |  |  | 13 |  |  | 24
Notional amount |  | 22,000,000 |  |  | 22,000,000 |  |  | 31,000,000
Fair value |  | $ (128,000,000) |  |  | $ (128,000,000) |  |  | $ (86,000,000)
Natural Gas |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Number of contracts |  | 36 |  |  | 36 |  |  | 46
Notional amount |  | 146,000,000 |  |  | 146,000,000 |  |  | 62,000,000
Fair value |  | $ 3,000,000 |  |  | $ 3,000,000 |  |  | $ (10,000,000)
Maximum | Coal Contract Derivatives |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Derivative, Term of Contract |  |  |  |  | 3 years |  |  |
Maximum | Natural Gas |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Derivative, Term of Contract |  |  |  |  | 3 years |  |  |
Natural Gas |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Fair value |  | (125,000,000) |  |  | $ (125,000,000) |  |  | (103,000,000)
Letter of Credit |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |
Amount of letters of credit outstanding |  | $ 1,100,000,000 |  |  | $ 1,100,000,000 |  |  | $ 1,000,000,000
[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 and nine months ended June 30, 2015 and 2014.
[2] | Fair values of certain derivatives under the FTP that were in net liability positions totaling $91 million and $69 million at June 30, 2015 and September 30, 2014, 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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