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Legal Proceedings Legal Proceedings (Details) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2013
Oct. 31, 2007
reactors
Dec. 31, 2013
General
Apr. 30, 2011
Environmental Agreements
Groups
Agreements
Jun. 30, 2011
Environmental Agreements
Megawatts
Units
Dec. 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
Dec. 31, 2010
Case Involving Tennessee Valley Authority Retirement System
Years
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
Legal_actions
People
Sep. 30, 2012
Administrative Proceedings Regarding Watts Bar Nuclear Plant Unit 2
Legal_actions
Dec. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Legal_actions
Aug. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Legal_actions
Dec. 31, 2013
Other Noncurrent Liabilities [Member]
General
Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Member]
General
Dec. 31, 2013
Other Regulatory Assets (Liabilities) [Member]
General
Legal Proceedings                                              
Legal loss contingency accrual     $ 282,000,000                                   $ 165,000,000 $ 89,000,000 $ 28,000,000
Loss Contingency, Range of Possible Loss, Minimum 1,100,000,000   282,000,000                                        
Loss Contingency, Range of Possible Loss, Maximum 1,200,000,000   294,000,000                                        
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 Board Members Appointed                 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                                  
Number of times mediation extended           4                                  
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                                  
Project amount completed toward 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                            
Retirement age of eligibility for cost of living adjustment before January 1, 2010                   55                          
Retirement age of eligibility for cost of living adjustment after January 1, 2010                   60                          
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 years that spent fuel can be stored after a plant's license is terminated                     60 years                        
Opposed contentions                         8                    
Number of contentions submitted by BREDL BEST and MATRR                         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 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 BREDL contentions                               1              
Number of contentions admitted for hearing                                 2            
Number of SACE contentions                           1     7 1          
Number of other petitioners                                 4            
Number of contentions remaining                                 1            
Number of John Sevier units retired 2                                            
Number of units at John Sevier Fossil 4                                            
Number of John Sevier units idled 2                                            
Number of requests accepted by the NRC                                     5        
Number of separate petitions filed by the Natural Resources Defense Council                                       12