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CONTINGENCIES, COMMITMENTS, AND GUARANTEES - Nuclear Fuel Disposal Costs and Nuclear Insurance (Details)
$ in Millions
 12 Months Ended 108 Months Ended
Dec. 31, 2024
USD ($)
plant
Dec. 31, 2019
USD ($)
Jointly Owned Utility Plant Interests [Line Items]    
Maximum fund for public liability claims arising from a single nuclear incident under price - anderson amendments act $ 16,300  
Maximum insurance coverage provided by American Nuclear Insurers to each nuclear plant 500  
Maximum amount that a company could be assessed per incident for each licensed reactor 166  
Maximum aggregate amount that a reactor can assess in a calendar period for each incident $ 25  
Block period considered for inflation adjustment against maximum assessment per reactor 5 years  
Maximum deductible waiting period 182 days  
Maximum coverage per occurrence per unit limit to obtain replacement power $ 490  
Aggregate payment for claims resulting from terrorist acts in one year period $ 3,200  
Alabama Power and Georgia Power    
Jointly Owned Utility Plant Interests [Line Items]    
Number of nuclear fuel plants | plant 3  
Maximum property damage insurance provided to nuclear generating facilities $ 1,500  
Maximum additional coverage provided for losses under excess insurance 1,250  
Maximum additional coverage provided for losses under excess insurance, non-nuclear losses $ 750  
Elected deductible waiting period 84 days  
Alabama Power    
Jointly Owned Utility Plant Interests [Line Items]    
Maximum assessment, excluding any applicable state premium taxes $ 332  
Maximum aggregate amount to be paid in one year 49  
Current maximum annual assessments under NEIL policies 60  
Alabama Power | Positive Outcome of Litigation    
Jointly Owned Utility Plant Interests [Line Items]    
Outstanding claims   $ 100
Georgia Power    
Jointly Owned Utility Plant Interests [Line Items]    
Maximum assessment, excluding any applicable state premium taxes 473  
Maximum aggregate amount to be paid in one year 71  
Current maximum annual assessments under NEIL policies $ 80  
Georgia Power | Court Of Federal Claims    
Jointly Owned Utility Plant Interests [Line Items]    
Litigation settlement   $ 121