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CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - GAS Equity Method Investments Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2014
mi
Schedule of Equity Method Investments [Line Items]            
Impairment charges     $ 251 $ 2 $ 0  
Income taxes (benefit)     795 267 393  
Southern Company Gas            
Schedule of Equity Method Investments [Line Items]            
Impairment charges     131 0 0  
Income taxes (benefit)     $ 180 275 $ 173  
Southern Company Gas | PennEast Pipeline            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage, equity method investment     20.00%     20.00%
Pipeline infrastructure (miles) | mi           118
Impairment charges $ 2 $ 82 $ 84 84    
Impairment charges, after tax $ 2 $ 58 $ 67 67    
Income taxes (benefit)       $ 7