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Segment and Related Information
9 Months Ended
Sep. 30, 2011
Segment and Related Information [Abstract] 
SEGMENT AND RELATED INFORMATION
  (I)   SEGMENT AND RELATED INFORMATION
 
      Southern Company’s reportable business segments are the sale of electricity primarily in the Southeast by the four traditional operating companies and Southern Power. Revenues from sales by Southern Power to the traditional operating companies were $85 million and $239 million for the three and nine months ended September 30, 2011, respectively, and $93 million and $288 million for the three and nine months ended September 30, 2010, respectively. The “All Other” column includes parent Southern Company, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include investments in telecommunications and leveraged lease projects. All other intersegment revenues are not material. Financial data for business segments and products and services was as follows:
                                                         
    Electric Utilities            
    Traditional                                
    Operating   Southern                   All        
    Companies   Power   Eliminations   Total   Other   Eliminations   Consolidated
    (in millions)  
Three Months Ended September 30, 2011:
                                                       
Operating revenues
  $ 5,145     $ 363     $ (97 )   $ 5,411     $ 38     $ (21 )   $ 5,428  
Segment net income (loss)*
    862       56             918             (2 )     916  
Nine Months Ended September 30, 2011:
                                                       
Operating revenues
  $ 13,246     $ 950     $ (288 )   $ 13,908     $ 114     $ (61 )   $ 13,961  
Segment net income (loss)*
    1,805       138             1,943       2       (3 )     1,942  
Total assets at
September 30, 2011
  $ 52,949     $ 3,757     $ (160 )   $ 56,546     $ 1,431     $ (634 )   $ 57,343  
 
 
                                                       
Three Months Ended September 30, 2010:
                                                       
Operating revenues
  $ 5,066     $ 357     $ (124 )   $ 5,299     $ 40     $ (19 )   $ 5,320  
Segment net income (loss)*
    756       63             819       (1 )     (1 )     817  
Nine Months Ended September 30, 2010:
                                                       
Operating revenues
  $ 13,127     $ 862     $ (367 )   $ 13,622     $ 122     $ (59 )   $ 13,685  
Segment net income (loss)*
    1,713       109             1,822       2       (2 )     1,822  
Total assets at
December 31, 2010
  $ 51,144     $ 3,438     $ (128 )   $ 54,454     $ 1,178     $ (600 )   $ 55,032  
 
* After dividends on preferred and preference stock of subsidiaries
Products and Services
                                 
    Electric Utilities’ Revenues
Period   Retail   Wholesale   Other   Total
            (in millions)        
Three Months Ended September 30, 2011
  $ 4,693     $ 557     $ 161     $ 5,411  
Three Months Ended September 30, 2010
    4,573       566       160       5,299  
Nine Months Ended September 30, 2011
  $ 11,931     $ 1,513     $ 464     $ 13,908  
Nine Months Ended September 30, 2010
    11,603       1,581       438       13,622