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FINANCING - DOE Loan Guarantee Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Aug. 31, 2018
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 7,733,000,000     $ 7,733,000,000        
Georgia Power                
Debt Instrument [Line Items]                
Percent of eligible project costs (may not exceed)     70.00%          
Principal amortization payments       73,000,000 $ 0 $ 0    
Line of credit facility, maximum borrowing capacity $ 1,750,000,000     $ 1,750,000,000        
Basis spread on variable rate     0.375%          
Amortization period     5 years          
Plant Vogtle Units 3 And 4 | Georgia Power                
Debt Instrument [Line Items]                
Percent ownership 45.70%     45.70%        
FFB Loan | Georgia Power                
Debt Instrument [Line Items]                
Eligible project costs to be reimbursed     $ 5,130,000,000          
Proceeds from lines of credit $ 329,000,000 $ 519,000,000            
Fixed stated interest rate of debt obligation 1.737%     1.737%     1.652%  
Principal amortization payments       $ 73,000,000        
Line of credit facility, maximum borrowing capacity $ 4,600,000,000     $ 4,600,000,000 $ 3,800,000,000      
Additional FFB Credit Facility | Georgia Power                
Debt Instrument [Line Items]                
Funds received under guarantee settlement agreement, less customer refunds     $ 1,492,000,000          
Plant Vogtle Units 3 And 4 | Georgia Power                
Debt Instrument [Line Items]                
Percent ownership 45.70%     45.70%        
Ownership interest percentage required for voting for continuing construction               90.00%