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Commitments and Contingencies Commitments and Contingencies - Legal Proceedings (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |
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Dec. 31, 2010 | Sep. 30, 2013 Phases | Sep. 30, 2013 General | Apr. 30, 2011 Environmental Agreements Agreements Groups | Jun. 30, 2011 Environmental Agreements Megawatts Units | Sep. 30, 2013 Kingston Ash Spill Number_of_extensions Legal_actions | Jun. 30, 2010 Kingston Ash Spill Years | Sep. 30, 2010 Case Involving Tennessee Valley Authority Retirement System | Mar. 31, 2010 Case Involving Tennessee Valley Authority Retirement System People | Dec. 31, 2010 Case Involving Tennessee Valley Authority Retirement System | Apr. 30, 2006 Case Arising out of Hurricane Katrina People Companies | Jun. 30, 2012 Case Involving the NRC Waste Confidence Decision on Spent Nuclear Fuel Storage | Jul. 31, 2013 Administrative Proceedings Regarding Sequoyah U1 and U2 [Member] Legal_actions | May 31, 2013 Administrative Proceedings Regarding Sequoyah U1 and U2 [Member] | Jun. 30, 2008 Administrative Proceedings Regarding Bellefonte Units 3 and 4 Legal_actions | Sep. 30, 2012 Administrative Proceedings Regarding Bellefonte Units 3 and 4 | Nov. 30, 2009 Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2 Legal_actions People | Sep. 30, 2012 Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2 Legal_actions | May 13, 2013 Case involving Colbert Fossil Plant [Member] | Dec. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Aug. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Sep. 30, 2013 Other long-term liabilities General | Sep. 30, 2013 Accounts payable and accrued liabilities General | Sep. 30, 2013 Noncurrent Regulatory Assets [Member] General
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of phases of soil cleanup |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  | $ 302,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 189,000,000 | $ 85,000,000 | $ 28,000,000
Estimated range of losses low end of range |  | 1,100,000,000 | 302,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated range of losses high end of range |  | 1,200,000,000 | 314,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of similar environmental agreements entered into |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with the EPA |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental agreements entered into with environmental advocacy groups |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units to be idled |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Megawatts option 1 |  |  |  |  | 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Megawatts option 2 |  |  |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be invested in certain environmental projects |  |  |  |  | 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to be provided to fund environmental projects |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to pay civil penalties |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed |  |  |  |  |  | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits dismissed |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active lawsuits |  |  |  |  |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases that received a bench trial |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of remaining cases |  |  |  |  |  | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of time to complete mediation |  |  |  |  |  | 120 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of times mediation extended |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed under various environmental statutes |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Civil penalty order issued June 1, 2010 |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of civil penalty order satisfied |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit against civil penalty order |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Down payment on natural resource damages |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years to pay for natural resource damages |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of participants that filed suit |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of TVARS Board members |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Board Members Appointed |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment before January 1, 2010 | 55 |  |  |  |  |  |  |  |  | 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement age of eligibility for cost of living adjustment after January 1, 2010 | 60 |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants that filed a motion to dismiss |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual defendants |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining defendant |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days to file an ammended complaint |  |  |  |  |  |  |  | 14 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Mississippi residents allegedly injured |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large oil companies sued |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of oil company trade associations sued |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large chemical companies sued |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of chemical trade associations sued |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large companies sued |  |  |  |  |  |  |  |  |  |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years that spent fuel can be stored after a plant's license is terminated |  |  |  |  |  |  |  |  |  |  |  | 60 years |  |  |  |  |  |  |  |  |  |  |  |
Opposed contentions |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL BEST and MATRR |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Number of petitioners with standing |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number of petitioners |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Number of contentions dismissed |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  | 1 |  |  |  |  |  |  |
Number of contentions left |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 2 |  |  |  |  |  |  |  |  |
Number of admitted contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL and SACE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Number of contentions no longer admitted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of BREDL contentions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of contentions admitted for hearing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of SACE contentions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 1 |  |  |  |  |  |
Number of other petitioners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Number of contentions remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Payment related to case involving Colbert Fossil Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |  |
Number of requests accepted by the NRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Number of separate petitions filed by the Natural Resources Defense Council |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |

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- Definition Civil penalty order issued by TDEC for the Kingston ash spill citing violations of the Tennessee Solid Waste Disposal Act and the Tennessee Water Control Quality Act. + References No definition available. + Details
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- Definition A down payment on natural resource damages paid each year for three years. + References No definition available. + Details
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- Definition Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee + References No definition available. + Details
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- Definition Number of environmental agreements entered into with environmental advocacy groups + References No definition available. + Details
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- Definition Number of environmental agreements entered into with the EPA + References No definition available. + Details
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- Definition Number of large chemical companies sued + References No definition available. + Details
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- Definition The remaining number of cases related to the Kingston Ash Spill that are still open. + References No definition available. + Details
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- Definition Number of requests accepted by the NRC + References No definition available. + Details
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- Definition Number of SACE contentions + References No definition available. + Details
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- Definition Number of similar environmental agreements entered into + References No definition available. + Details
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- Definition Number of years that spent fuel can be stored after a plant's license is terminated + References No definition available. + Details
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- Definition Number of years to pay for natural resource damages + References No definition available. + Details
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- Definition Payment related to case involving Colbert Fossil Plant + References No definition available. + Details
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