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Legal Proceedings Legal Proceedings (Details) (USD $)
 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Jun. 30, 2012
General
Apr. 30, 2011
Environmental Agreements
Jun. 30, 2011
Environmental Agreements
Jun. 30, 2012
Kingston Ash Spill
Oct. 31, 2011
Kingston Ash Spill
Jan. 31, 2011
Kingston Ash Spill
Jun. 30, 2010
Kingston Ash Spill
Mar. 31, 2010
Case Involving Tennessee Valley Authority Retirement System
Sep. 30, 2010
Case Involving Tennessee Valley Authority Retirement System
Apr. 30, 2006
Case Arising out of Hurricane Katrina
Jul. 31, 2004
Global Warming Cases
Jul. 31, 2010
Case Regarding Bellefonte Nuclear Plant Units 1 and 2
Aug. 31, 2011
Administrative Proceedings Regarding Bellefonte Units 3 and 4
Jun. 30, 2008
Administrative Proceedings Regarding Bellefonte Units 3 and 4
Nov. 30, 2009
Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2
Apr. 30, 2008
Information Request from the EPA
Dec. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Aug. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Jun. 30, 2012
Case Involving the NRC Waste Confidence Decision on Spent Nuclear Fuel Storage
Legal Proceedings                                        
Legal loss contingency accrual   $ 367,000,000                                    
Portion of legal loss contingency included in other long-term liabilities   251,000,000                                    
Portion of legal loss contingency included in accounts payable and accrued liabilities   106,000,000                                    
Portion of legal loss contingency included in regulatory assets   10,000,000                                    
Possible loss above amount accrued   6,000,000                                    
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 2     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 cases with district court approved stipulations         54                              
Number of remaining cases         56                              
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                    
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 global warming suits filed and subsequently dismissed                       2                
Number of BREDL petitions subsequently dismissed                         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          
Number of contentions admitted for hearing                               2        
Number of SACE contentions                           1   7        
Number of other petitioners                               4        
Number of contentions dismissed                               1        
Number of contentions remaining                               1        
Number of coal-fired units referenced in the EPA information request                                 14      
Number of requests accepted by the NRC                                   5    
Number of separate petitions filed by the Natural Resources Defense Council                                     12  
Number of years that spent fuel can be stored after a plant's license is terminated                                       60