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Acquisitions and Dispositions - Southern Company Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Jul. 22, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Preliminary gain       $ 2,517 $ 324      
Impairment charges   $ 18   50        
Leveraged leases   799   799       $ 798
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GULF POWER CO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of businesses, net of cash divested $ 5,800              
Amount of indebtedness assumed at closing $ 1,300              
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PowerSecure Utility Infrastructure Services Unit                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Sale price             $ 71  
Disposal Group, Held-for-sale, Not Discontinued Operations | PowerSecure Utility Infrastructure Services Unit                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment charges     $ 32          
Disposal Group, Held-for-sale, Not Discontinued Operations | PowerSecure International, Inc. Lighting Business                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Impairment charges   2            
Goodwill, intangibles, and other assets impairment charge   18            
Disposal Group, Held-for-sale, Not Discontinued Operations | Leverage Lease Investment                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Leveraged leases   $ 6   $ 6        
Scenario, Forecast | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GULF POWER CO                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Preliminary gain           $ 2,500    
Preliminary gain, net of tax           1,300    
Scenario, Forecast | Disposal Group, Disposed of by Sale, Not Discontinued Operations | PowerSecure International, Inc. Lighting Business                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Sale price           8    
Scenario, Forecast | Disposal Group, Held-for-sale, Not Discontinued Operations | Leverage Lease Investment                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Sale price           $ 20