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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Income Tax Contingency [Line Items]      
Effective tax (benefit) rate 10.70% 18.70%  
ALABAMA POWER CO      
Income Tax Contingency [Line Items]      
Effective tax (benefit) rate 3.90% 23.60%  
GEORGIA POWER CO      
Income Tax Contingency [Line Items]      
Effective tax (benefit) rate 15.80% 16.40%  
Unrecognized tax positions $ 48    
SOUTHERN POWER CO      
Income Tax Contingency [Line Items]      
Effective tax (benefit) rate (0.70%) 11.20%  
Southern Company parent(a)      
Income Tax Contingency [Line Items]      
Unrecognized tax positions $ 130   $ 80
MISSISSIPPI POWER CO      
Income Tax Contingency [Line Items]      
Effective tax (benefit) rate 15.20% 18.80%