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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 |
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Dec. 31, 2010 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 General | Apr. 30, 2011 Environmental Agreements Groups Agreements | Jun. 30, 2011 Environmental Agreements Units Megawatts | Sep. 30, 2014 Kingston Ash Spill Legal_actions | Jun. 30, 2014 Kingston Ash Spill Legal_actions | Jun. 30, 2010 Kingston Ash Spill | 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 | 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] | Aug. 31, 2011 Administrative Proceedings Regarding Bellefonte Units 3 and 4 | 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 People Legal_actions | Dec. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Aug. 31, 2011 Petitions Resulting from Japanese Nuclear Events Legal_actions | Sep. 30, 2014 Other long-term liabilities General | Sep. 30, 2014 Accounts payable and accrued liabilities General
Legal Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  | $ 15,000,000 | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal loss contingency accrual |  |  |  | 172,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,000,000 | 64,000,000
Estimated range of losses low end of range |  |  |  | 172,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated range of losses high end of range |  |  |  | 173,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active lawsuits |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Legal Settlements |  |  |  |  |  |  | 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of participants that filed suit |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Number of TVARS Board members |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Number of Board Members Appointed |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants that filed a motion to dismiss |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
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 days to file an ammended complaint |  |  |  |  |  |  |  |  |  | 14 days |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years that spent fuel can be stored after a plant's license is terminated |  |  |  |  |  |  |  |  |  |  |  |  | 60 years |  |  |  |  |  |  |  |  |  |
Number of contentions submitted by BREDL BEST and MATRR |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |
Opposed contentions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 7 |  |  |  |
Number of other petitioners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Number of contentions remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of units at John Sevier Fossil |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Affected by Paradise Case |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of requests accepted by the NRC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Number of separate petitions filed by the Natural Resources Defense Council |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |
Number of individual defendants |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Remaining defendant |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Retirement age of eligibility for cost of living adjustment after January 1, 2010. + References No definition available. + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during 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 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration