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Commitments and Contingencies Commitments and Contingencies - Legal Proceedings (Details)
 1 Months Ended 12 Months Ended
Jul. 31, 2013
Legal_actions
May 31, 2013
Apr. 30, 2011
Agreements
Groups
Mar. 31, 2010
USD ($)
People
Jun. 30, 2008
Legal_actions
Oct. 31, 2007
Legal_actions
Sep. 30, 2016
USD ($)
Dec. 31, 2010
Years
Jun. 30, 2011
USD ($)
Units
megawatts
Legal Proceedings                  
TDEC civil penalties related to Gallatin             $ 17,000    
Plaintiff civil penalties related to Gallatin             $ 37,500    
Number of reactors a COL was submitted for | Legal_actions           2      
Number of days the EPA has to respond             60    
General                  
Legal Proceedings                  
Legal loss contingency accrual             $ 61,000,000    
Environmental Agreements                  
Legal Proceedings                  
Number of similar environmental agreements entered into | Agreements     2            
Number of environmental agreements entered into with the EPA | Agreements     1            
Number of environmental agreements entered into with Alabama, Kentucky, North Carolina, and Tennessee | Agreements     1            
Number of environmental agreements entered into with environmental advocacy groups | Groups     3            
Number of units to be idled | Units                 18
Megawatts option 1 | megawatts                 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
Case Involving Tennessee Valley Authority Retirement System                  
Legal Proceedings                  
Number of participants that filed suit | People       8          
Contribution related to TVARS case       $ 1,000,000,000          
Retirement age of eligibility for cost of living adjustment before January 1, 2010 | Years               55  
Retirement age of eligibility for cost of living adjustment after January 1, 2010 | Years               60  
Administrative Proceedings Regarding Sequoyah U1 and U2                  
Legal Proceedings                  
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 | Legal_actions 7                
Number of contentions left | Legal_actions 1                
Administrative Proceedings Regarding Bellefonte Units 3 and 4                  
Legal Proceedings                  
Number of contentions left | Legal_actions         2        
Number of admitted contentions submitted by BREDL and SACE | Legal_actions         4        
Number of contentions submitted by BREDL and SACE | Legal_actions         20        
Number of contentions no longer admitted | Legal_actions         2        
Other long-term liabilities | General                  
Legal Proceedings                  
Legal loss contingency accrual             18,000,000    
Accounts payable and accrued liabilities | General                  
Legal Proceedings                  
Legal loss contingency accrual             $ 43,000,000