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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
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