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Legal Proceedings Legal Proceedings (Details) (USD $)
 1 Months Ended 1 Months Ended
Jun. 30, 2013
Legal_actions
appealed_findings
May 13, 2013
Mar. 31, 2013
Oct. 31, 2007
reactors
Jun. 30, 2013
General
Apr. 30, 2011
Environmental Agreements
Groups
Agreements
Jun. 30, 2011
Environmental Agreements
Megawatts
Units
Jun. 30, 2013
Kingston Ash Spill
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
Apr. 30, 2006
Case Arising out of Hurricane Katrina
Companies
People
Aug. 31, 2011
Administrative Proceedings Regarding Bellefonte Units 3 and 4
Jun. 30, 2008
Administrative Proceedings Regarding Bellefonte Units 3 and 4
Legal_actions
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
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, 2013
Other Noncurrent Liabilities [Member]
General
Jun. 30, 2013
Accounts Payable and Accrued Liabilities [Member]
General
Jun. 30, 2013
Other Regulatory Assets (Liabilities) [Member]
General
Legal Proceedings                                              
Legal loss contingency accrual         $ 319,000,000                               $ 219,000,000 $ 90,000,000 $ 10,000,000
Loss Contingency, Range of Possible Loss, Minimum 1,100,000,000       319,000,000                                    
Loss Contingency, Range of Possible Loss, Maximum 1,200,000,000       349,000,000                                    
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 TVA 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                                            
Extended time to complete mediation 75 days   120 days                                        
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 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          
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 nuclear reactors       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 contentions left                           2         1        
Number of contentions admitted for hearing                             2                
Number of SACE contentions                         1   7                
Number of other petitioners                             4                
Number of contentions dismissed                             1       7        
Number of contentions remaining                             1                
Number of appealed findings 2                                            
Number of requests accepted by the NRC                               5              
Number of separate petitions filed by the Natural Resources Defense Council                                 12            
Payment related to case involving Colbert Fossil Plant   $ 150,000