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REGULATORY MATTERS - GPC Fuel Cost and Storm Damage Recovery (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended 36 Months Ended
Jan. 01, 2023
Nov. 30, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]            
Net regulatory assets     $ 4,711 $ 5,833   $ 5,833
Other regulatory assets     653 860   860
Other regulatory assets, deferred     5,577 5,918   5,918
Georgia Power            
Public Utilities, General Disclosures [Line Items]            
Approved decrease in annual billing based on fuel cost recovery rate         $ 740  
Approved decrease in annual billing based on fuel cost recovery rate, term         2 years  
Public utilities, approved rate increase (decrease), amount   $ 252     $ (44)  
Approved rate increase, percent   15.00%        
Adjustment to fuel cost recovery rate if under recovered fuel balance exceeds budget thereafter     200      
Over (under) recovered fuel balance     (400) $ (2,100)   (2,100)
Required period for options and hedges       36 months    
Storm damage reserves           213
Net regulatory assets     3,928 $ 4,663   4,663
Other regulatory assets     289 324   324
Other regulatory assets, deferred     $ 1,964 2,522   2,522
Georgia Power | Scenario, Forecast            
Public Utilities, General Disclosures [Line Items]            
Storm damage reserves $ 31          
Georgia Power | Storm damage reserves            
Public Utilities, General Disclosures [Line Items]            
Regulatory liabilities       83   83
Net regulatory assets       $ 48   $ 48