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Segment and Related Information - Schedule of Financial Data for Products and Services (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Concentration Risk [Line Items]        
Operating revenues $ 5,748 $ 7,206 $ 12,228 $ 13,854
Electric Utilities        
Concentration Risk [Line Items]        
Operating revenues 4,764 6,006 9,247 10,516
Southern Company Gas' Revenues        
Concentration Risk [Line Items]        
Operating revenues 852 1,083 2,728 3,140
Retail electric revenues        
Concentration Risk [Line Items]        
Operating revenues 3,859 4,789 7,458 8,402
Retail electric revenues | Electric Utilities        
Concentration Risk [Line Items]        
Operating revenues 3,859 4,789 7,458 8,402
Wholesale electric revenues        
Concentration Risk [Line Items]        
Operating revenues 605 937 1,203 1,601
Wholesale electric revenues | Electric Utilities        
Concentration Risk [Line Items]        
Operating revenues 605 937 1,203 1,601
Other Revenue | Electric Utilities        
Concentration Risk [Line Items]        
Operating revenues 300 280 586 513
Other electric revenues        
Concentration Risk [Line Items]        
Operating revenues 209 192 399 370
Natural Gas        
Concentration Risk [Line Items]        
Operating revenues 852 1,083 2,728 3,140
Gas Distribution Operations | Southern Company Gas' Revenues        
Concentration Risk [Line Items]        
Operating revenues 761 975 2,372 2,765
Gas marketing services | Southern Company Gas' Revenues        
Concentration Risk [Line Items]        
Operating revenues 75 92 320 335
Other | Southern Company Gas' Revenues        
Concentration Risk [Line Items]        
Operating revenues 16 16 36 40
Other revenues        
Concentration Risk [Line Items]        
Operating revenues $ 223 $ 205 $ 440 $ 341