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REGULATORY MATTERS - GPC Nuclear Construction and Cost and Schedule (Details)
$ in Millions
 3 Months Ended 12 Months Ended 192 Months Ended
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2012
utility
MW
Dec. 31, 2024
USD ($)
Public Utilities, General Disclosures [Line Items]            
Pre-tax credit to income   $ 21 $ 68 $ (183)    
Georgia Power            
Public Utilities, General Disclosures [Line Items]            
Number of construction units approved | utility         2  
Electric generating capacity (in MWs) | MW         1,100  
Pre-tax credit to income $ 21 $ 21 68 $ (183)    
After tax credit to income $ 16          
Plant Vogtle Units 3 and 4 | Georgia Power            
Public Utilities, General Disclosures [Line Items]            
Percent ownership   45.70%       45.70%
Total project capital cost forecast   $ 10,732       $ 10,732
Net investment   (10,663)       (10,663)
Remaining estimate to complete   69       69
Estimated cost to complete, costs not shared with other owners   1,200       1,200
Total AFUDC and interest capitalized, accrual amount   440 $ 14     440
Estimated construction financing costs   3,530       3,530
Proceeds from recovery of financing costs           3,080
Plant Vogtle Units 3 and 4 | Georgia Power | Twenty Fifth Vogtle Construction Monitoring Report            
Public Utilities, General Disclosures [Line Items]            
Maximum guarantee   1,700       $ 1,700
Customer refund   $ 188