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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivatives Under Financial Trading Program (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Derivative |  |  |  |
FTP transaction limit | $ 130,000,000 |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
Natural Gas Futures |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 0 |
Fair value | 0 |  | 0 |
Fuel Oil/Crude Oil Futures |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 0 |
Fair value | 0 |  | 0 |
Natural Gas Swap |  |  |  |
Derivative |  |  |  |
Notional amount | 102,227,500 | [1] | 152,922,500 | [1]
Fair value | (103,000,000) | [1] | (169,000,000) | [1]
Fuel Oil/Crude Oil Swap |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 1,205,000 | [1]
Fair value | 0 |  | 3,000,000 | [1]
Natural Gas Option |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 0 |
Fair value | 0 |  | 0 |
Fuel Oil/Crude Oil Option |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 0 |
Fair value | 0 |  | 0 |
Natural Gas Total Contracts |  |  |  |
Derivative |  |  |  |
Notional amount | 102,227,500 | [1] | 152,922,500 | [1]
Unrealized gains/losses on derivatives | (103,000,000) |  | (169,000,000) |
Decrease (increase) in fuel expense | (34,000,000) |  | (78,000,000) |
Decrease (increase) in purchased power expense | (11,000,000) |  | (51,000,000) |
Fair value | (103,000,000) | [1] | (169,000,000) | [1]
Fuel Oil/Crude Oil Total Contracts |  |  |  |
Derivative |  |  |  |
Notional amount | 0 |  | 1,205,000 | [1]
Unrealized gains/losses on derivatives | 0 |  | 3,000,000 |
Decrease (increase) in fuel expense | 2,000,000 |  | 4,000,000 |
Fair value | 0 |  | 3,000,000 | [1]
Coal Contract Total Contracts |  |  |  |
Derivative |  |  |  |
Unrealized gains/losses on derivatives | 0 |  | 0 |
Decrease (increase) in fuel expense | 0 |  | (1,000,000) |
Fair value | 0 |  | 0 |
Closed Derivative Contracts |  |  |  |
Derivative |  |  |  |
Fair value | $ (5,000,000) |  | $ (8,000,000) |
Swap contracts |  |  |  |
Derivative |  |  |  |
Remaining terms | 3 years |  |  |
[1] | Due to the right of setoff and method of settlement, TVA elects to record commodity derivatives under the FTP based on its net commodity position with the broker or other counterparty. Notional amounts disclosed represent the net absolute value of contractual amounts.

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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 The decrease (increase) in fuel expense relating to the FTP. + References No definition available. + Details
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- Definition The decrease (increase) in purchased power expense related to the FTP. + References No definition available. + Details
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- Definition FTP transaction limit + References No definition available. + Details
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- Definition Remaining terms + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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