XML 61 R113.htm IDEA: XBRL DOCUMENT v2.4.0.8
Commitments and Contingencies Commitments and Contingencies - Legal Proceedings (Details) (USD $)
 12 Months Ended 1 Months Ended 12 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, 2010
Sep. 30, 2013
Phases
Sep. 30, 2013
General
Apr. 30, 2011
Environmental Agreements
Agreements
Groups
Jun. 30, 2011
Environmental Agreements
Megawatts
Units
Sep. 30, 2013
Kingston Ash Spill
Number_of_extensions
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
Apr. 30, 2006
Case Arising out of Hurricane Katrina
People
Companies
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, 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
May 13, 2013
Case involving Colbert Fossil Plant [Member]
Dec. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Legal_actions
Aug. 31, 2011
Petitions Resulting from Japanese Nuclear Events
Legal_actions
Sep. 30, 2013
Other long-term liabilities
General
Sep. 30, 2013
Accounts payable and accrued liabilities
General
Sep. 30, 2013
Noncurrent Regulatory Assets [Member]
General
Legal Proceedings                                                
Number of phases of soil cleanup   2                                            
Legal loss contingency accrual     $ 302,000,000                                     $ 189,000,000 $ 85,000,000 $ 28,000,000
Estimated range of losses low end of range   1,100,000,000 302,000,000                                          
Estimated range of losses high end of range   1,200,000,000 314,000,000                                          
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 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           3                                    
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 Board Members Appointed                 1                              
Retirement age of eligibility for cost of living adjustment before January 1, 2010 55                 55                            
Retirement age of eligibility for cost of living adjustment after January 1, 2010 60                 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 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                        
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 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                                 7 1            
Number of other petitioners                                 4              
Number of contentions remaining                                 1              
Payment related to case involving Colbert Fossil Plant                                     $ 150,000          
Number of requests accepted by the NRC                                       5        
Number of separate petitions filed by the Natural Resources Defense Council                                         12