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Legal Proceedings Legal Proceedings (Details) (USD $)
 1 Months Ended 1 Months Ended
Mar. 31, 2013
Legal_actions
appealed_findings
Oct. 31, 2007
reactors
Mar. 31, 2013
General
Apr. 30, 2011
Environmental Agreements
Groups
Agreements
Jun. 30, 2011
Environmental Agreements
Megawatts
Units
Mar. 31, 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
People
Companies
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
Legal Proceedings                                
Legal loss contingency accrual     $ 340,000,000                          
Portion of legal loss contingency included in other long-term liabilities     226,000,000                          
Portion of legal loss contingency included in accounts payable and accrued liabilities     104,000,000                          
Portion of legal loss contingency included in regulatory assets     10,000,000                          
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 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 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        
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 appealed findings 2                              
Number of requests accepted by the NRC                           5    
Number of separate petitions filed by the Natural Resources Defense Council                             12