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Summary of Significant Accounting Policies - Accumulated Provisions and Estimated Costs For Decommissioning (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Alabama Power [Member]
   
Accumulated Provisions for Decommissioning    
Total $ 734 $ 626
Decommissioning    
Total site study costs 1,442  
Alabama Power [Member] | Plant Farley [Member]
   
Decommissioning    
Beginning Year 2037  
Completion Year 2076  
Alabama Power [Member] | Accumulated Provisions for Decommissioning External Trust Funds [Member]
   
Accumulated Provisions for Decommissioning    
Total 713 604
Alabama Power [Member] | Accumulated Provisions for Decommissioning Internal Reserves [Member]
   
Accumulated Provisions for Decommissioning    
Total 21 22
Alabama Power [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 1,362  
Alabama Power [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs 80  
Plant Farley [Member]
   
Accumulated Provisions for Decommissioning    
Total 734 626
Decommissioning    
Beginning Year 2037  
Completion Year 2076  
Total site study costs 1,442  
Plant Farley [Member] | Accumulated Provisions for Decommissioning External Trust Funds [Member]
   
Accumulated Provisions for Decommissioning    
Total 713 604
Plant Farley [Member] | Accumulated Provisions for Decommissioning Internal Reserves [Member]
   
Accumulated Provisions for Decommissioning    
Total 21 22
Plant Farley [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 1,362  
Plant Farley [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs 80  
Plant Hatch [Member]
   
Accumulated Provisions for Decommissioning    
Total 469 435
Decommissioning    
Beginning Year 2034  
Completion Year 2068  
Total site study costs 731  
Plant Hatch [Member] | Accumulated Provisions for Decommissioning External Trust Funds [Member]
   
Accumulated Provisions for Decommissioning    
Total 469 435
Plant Hatch [Member] | Accumulated Provisions for Decommissioning Internal Reserves [Member]
   
Accumulated Provisions for Decommissioning    
Total 0 0
Plant Hatch [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 680  
Plant Hatch [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs 51  
Plant Hatch [Member] | Georgia Power [Member]
   
Decommissioning    
Beginning Year 2034  
Completion Year 2068  
Total site study costs 731  
External trust funds 469  
Plant Hatch [Member] | Georgia Power [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 549  
Plant Hatch [Member] | Georgia Power [Member] | Spent Fuel Management [Member]
   
Decommissioning    
Total site study costs 131  
Plant Hatch [Member] | Georgia Power [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs 51  
Plant Vogtle [Member]
   
Accumulated Provisions for Decommissioning    
Total 277 256
Decommissioning    
Beginning Year 2047  
Completion Year 2072  
Total site study costs 644  
Plant Vogtle [Member] | Accumulated Provisions for Decommissioning External Trust Funds [Member]
   
Accumulated Provisions for Decommissioning    
Total 277 256
Plant Vogtle [Member] | Accumulated Provisions for Decommissioning Internal Reserves [Member]
   
Accumulated Provisions for Decommissioning    
Total 0 0
Plant Vogtle [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 568  
Plant Vogtle [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs 76  
Plant Vogtle [Member] | Georgia Power [Member]
   
Decommissioning    
Beginning Year 2047  
Completion Year 2072  
Total site study costs 644  
External trust funds 277  
Plant Vogtle [Member] | Georgia Power [Member] | Site Study Cost Radiated Structures [Member]
   
Decommissioning    
Total site study costs 453  
Plant Vogtle [Member] | Georgia Power [Member] | Spent Fuel Management [Member]
   
Decommissioning    
Total site study costs 115  
Plant Vogtle [Member] | Georgia Power [Member] | Site Study Cost Non-Radiated Structures [Member]
   
Decommissioning    
Total site study costs $ 76