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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended
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Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2012 | Jun. 30, 2013 Interest Rate Swap | Jun. 30, 2012 Interest Rate Swap | Jun. 30, 2013 Interest Rate Swap | Jun. 30, 2012 Interest Rate Swap | Jun. 30, 2013 Coal Contract Derivatives | Sep. 30, 2012 Coal Contract Derivatives | Jun. 30, 2013 Commodity Contract Derivatives | Jun. 30, 2012 Commodity Contract Derivatives | Jun. 30, 2013 Commodity Contract Derivatives | Jun. 30, 2012 Commodity Contract Derivatives | Jun. 30, 2013 Commodity Derivatives Under Financial Trading Program | Jun. 30, 2012 Commodity Derivatives Under Financial Trading Program | Jun. 30, 2013 Commodity Derivatives Under Financial Trading Program | Jun. 30, 2012 Commodity Derivatives Under Financial Trading Program | Sep. 30, 2012 Commodity Derivatives Under Financial Trading Program | Jun. 30, 2013 Natural Gas Contract Derivatives | Sep. 30, 2012 Natural Gas Contract Derivatives | Jun. 30, 2013 Maximum Coal Contract Derivatives | Jun. 30, 2013 Maximum Natural Gas Contract Derivatives
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives |  | $ 0 |  |  | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] |  |  | $ (2,000,000) | [1] | $ (6,000,000) | [1] | $ (2,000,000) | [1] | $ (22,000,000) | [1] | $ (21,000,000) | [1] | $ (104,000,000) | [1] | $ (99,000,000) | [1] | $ (248,000,000) | [1] |  |  |  |  |
Unrealized gains (losses) on investments |  |  |  |  | 252,000,000 |  |  |  | 465,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  |  |  |  |  |  | (109,000,000) | (267,000,000) | (111,000,000) |  |  |  | (111,000,000) |  |  |  | (181,000,000) |  |  |  | (181,000,000) |  |  |  | (229,000,000) | (2,000,000) | 0 |  |
Derivative, Term of Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 2 years
Number of contracts |  |  |  |  |  |  |  |  |  |  |  |  | 23 | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 | 25 |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | 44,000,000 | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,000,000 | 51,000,000 |  |
Unrealized gain (loss) on derivatives | $ 0 | $ 0 | $ 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 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, 2013, and 2012.

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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 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=28364263&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=28364263&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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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + 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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- Definition Number of price risk derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 + 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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