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Acquisitions - Schedule of Acquisitions (Details)
$ in Millions
Jul. 01, 2016
MW
Jun. 30, 2016
USD ($)
MW
Apr. 07, 2016
MW
Mar. 04, 2016
MW
Feb. 11, 2016
MW
Dec. 31, 2015
USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Goodwill   $ 264       $ 2
Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Goodwill   2       $ 2
Southern Company Gas [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Current assets   1,474        
Property, plant, and equipment   9,795        
Goodwill   6,333        
Intangible assets   436        
Regulatory assets   846        
Other assets   273        
Current liabilities   (2,205)        
Deferred credits and other liabilities   (4,529)        
Long-term debt   (4,261)        
Noncontrolling interests   (160)        
Total purchase price   8,002        
PowerSecure International, Inc. [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Current assets   174        
Property, plant, and equipment   48        
Goodwill   262        
Intangible assets   99        
Other assets   8        
Current liabilities   (111)        
Long-term debt, including current portion   (47)        
Deferred credits and other liabilities   (4)        
Total purchase price   $ 429        
Calipatria [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Solar (MW) | MW         20  
Southern Power Percentage Ownership         90.00%  
PPA Contract Period         20 years  
East Pecos [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Solar (MW) | MW       120    
Southern Power Percentage Ownership       100.00%    
PPA Contract Period       15 years    
Grant Wind, LLC [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Wind (MW) | MW     151      
Southern Power Percentage Ownership     100.00%      
PPA Contract Period     20 years      
Passadumkeag [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Wind (MW) | MW   42        
Southern Power Percentage Ownership   100.00%        
PPA Contract Period   15 years        
Henrietta [Member] | Subsequent Event [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Solar (MW) | MW 102          
Southern Power Percentage Ownership 51.00%          
PPA Contract Period 20 years          
Lamesa [Member] | Subsequent Event [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Solar (MW) | MW 102          
Southern Power Percentage Ownership 100.00%          
PPA Contract Period 15 years          
Rutherford [Member] | Subsequent Event [Member] | Southern Power [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Approx. Nameplate Capacity, Solar (MW) | MW 74          
Southern Power Percentage Ownership 90.00%          
PPA Contract Period 15 years          
Series of Business Acquisitions [Member] | Southern Power [Member] | Class A Membership Interest [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Southern Power Percentage Ownership   100.00%        
Percentage Of Entitled Cash Distributions   51.00%        
Series of Business Acquisitions [Member] | SunPower Corp. [Member] | Class B Membership Interest [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Percentage Of Entitled Cash Distributions   49.00%        
Series of Business Acquisitions [Member] | Recurrent Energy [Member] | Class B Membership Interest [Member]            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]            
Southern Power Percentage Ownership   100.00%