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REGULATORY MATTERS - GAS Schedule of Unrecognized Ratemaking Amounts (Details) - Regulatory Asset Off Balance Sheet - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Atlanta Gas Light    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory asset $ 35 $ 47
Virginia Natural Gas    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory asset 10 10
Chattanooga Gas    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory asset 2 4
Nicor Gas    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory asset 3 0
Southern Company Gas    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory asset $ 50 $ 61