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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Jul. 15, 2012 | Apr. 15, 2012 | Mar. 31, 2013 Interest Rate Swap | Mar. 31, 2012 Interest Rate Swap | Mar. 31, 2013 Interest Rate Swap | Mar. 31, 2012 Interest Rate Swap | Mar. 31, 2013 Coal Contract Derivatives | Sep. 30, 2012 Coal Contract Derivatives | Mar. 31, 2013 Commodity Contract Derivatives | Mar. 31, 2012 Commodity Contract Derivatives | Mar. 31, 2013 Commodity Contract Derivatives | Mar. 31, 2012 Commodity Contract Derivatives | Mar. 31, 2013 Commodity Derivatives Under Financial Trading Program | Mar. 31, 2012 Commodity Derivatives Under Financial Trading Program | Mar. 31, 2013 Commodity Derivatives Under Financial Trading Program | Mar. 31, 2012 Commodity Derivatives Under Financial Trading Program | Sep. 30, 2012 Commodity Derivatives Under Financial Trading Program | Mar. 31, 2013 Natural Gas Contract Derivatives | Sep. 30, 2012 Natural Gas Contract Derivatives
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain (loss) recognized in income on derivatives |  |  |  | $ 0 |  |  |  | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] | $ 0 | [1] |  |  | $ 0 | [1] | $ (3,000,000) | [1] | $ 0 | [1] | $ (16,000,000) | [1] | $ (32,000,000) | [1] | $ (88,000,000) | [1] | $ (77,000,000) | [1] | $ (144,000,000) | [1] |  |  |  |
Interest rate derivatives - fixed interest rate |  |  |  |  |  |  | 8.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives - notional amount |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investments |  |  |  |  |  |  |  | 99,000,000 |  |  |  | 213,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (148,000,000) | (267,000,000) |  |  |  |  |  |  |  |  | (161,000,000) | [2] |  |  | (161,000,000) | [2] |  |  | (229,000,000) | [2] | 0 | 0
Maximum number of years left on the derivative terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | two years |
Number of contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 25
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000,000 | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 | 51,000,000
Unrealized gain (loss) on derivatives |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of bond issuance | $ 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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 six months ended March 31, 2013, and 2012.
[2] |

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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 amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + Details
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