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Introduction - Schedule of Goodwill (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill $ 5,161 $ 5,161
SOUTHERN Co GAS    
Goodwill [Line Items]    
Goodwill 5,015 5,015
SOUTHERN Co GAS | Gas distribution operations    
Goodwill [Line Items]    
Goodwill 4,034 4,034
SOUTHERN Co GAS | Gas marketing services    
Goodwill [Line Items]    
Goodwill $ 981 $ 981