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Acquisitions - Schedule of Acquisitions (Details)
$ in Millions
9 Months Ended
Oct. 26, 2016
MW
Aug. 26, 2016
MW
Jul. 01, 2016
MW
Jun. 30, 2016
MW
Apr. 07, 2016
MW
Mar. 04, 2016
MW
Feb. 11, 2016
MW
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Goodwill               $ 6,223 $ 2
Southern Company Gas [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Current assets               1,557  
Property, plant, and equipment               10,108  
Goodwill               5,937  
Intangible assets               400  
Regulatory assets               1,118  
Other assets               229  
Current liabilities               (2,201)  
Deferred credits and other liabilities               (4,712)  
Long-term debt               (4,261)  
Noncontrolling interests               (174)  
Total purchase price               8,001  
PowerSecure International, Inc. [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Current assets               172  
Property, plant, and equipment               46  
Goodwill               284  
Intangible assets               101  
Other assets               6  
Current liabilities               (145)  
Long-term debt, including current portion               (18)  
Deferred credits and other liabilities               (17)  
Total purchase price               429  
Southern Power [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Contingent Consideration, Liability               30 36
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Goodwill               2 $ 2
Southern Power [Member] | Calipatria [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    
Southern Power [Member] | East Pecos [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      
Southern Power [Member] | Grant Plains [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Approx. nameplate capacity, wind (MW) | MW   147              
Southern Power Percentage Ownership   100.00%              
PPA Contract Period   12 years              
Southern Power [Member] | Grant Wind, LLC [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        
Southern Power [Member] | Henrietta [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            
Southern Power [Member] | Lamesa [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            
Southern Power [Member] | Passadumkeag [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          
Southern Power [Member] | Rutherford [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            
Southern Power [Member] | Series of Business Acquisitions [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Contingent Consideration, Liability               $ 145  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
PPA Contract Period               20 years  
Southern Power [Member] | Series of Business Acquisitions [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%  
Southern Power [Member] | Subsequent Event [Member] | Mankato [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Southern Power Percentage Ownership 100.00%                
PPA Contract Period 10 years                
Capacity of Natural Gas Facility | MW 375                
Southern Power [Member] | Subsequent Event [Member] | Mankato Expansion [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
PPA Contract Period 20 years                
Capacity of Natural Gas Facility | MW 345                
Southern Power [Member] | Subsequent Event [Member] | Wake Wind [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Approx. nameplate capacity, wind (MW) | MW 257                
Southern Power Percentage Ownership 90.10%                
PPA Contract Period 12 years                
SunPower Corp. [Member] | Series of Business Acquisitions [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%  
Recurrent Energy [Member] | Series of Business Acquisitions [Member] | Class B Membership Interest [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
Southern Power Percentage Ownership               100.00%  
Oklahoma Municipal Power Authority [Member] | Southern Power [Member] | Grant Plains [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
PPA Contract Period   20 years              
Steelcase, Inc. [Member] | Southern Power [Member] | Grant Plains [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
PPA Contract Period   12 years              
Allianz Risk Transfer (Bermuda) Ltd. [Member] | Southern Power [Member] | Grant Plains [Member]                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                  
PPA Contract Period   10 years