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Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - GEORGIA POWER CO - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 01, 2024
Apr. 29, 2024
Aug. 01, 2023
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Public Utilities, General Disclosures [Line Items]              
Return on equity reduction, negative impact on earnings         $ 10    
Recovery of construction and capital costs       $ 10      
Plant Vogtle Unit 3              
Public Utilities, General Disclosures [Line Items]              
Requested rate increase, annual amount     $ 318        
Plant Vogtle Units 3 And 4              
Public Utilities, General Disclosures [Line Items]              
Regulatory asset amortization period       10 years   10 years  
Approved rate increase (decrease)   $ 5,462       $ 2,100  
Approved recovery of retail rate items           362  
Associated retail rate base items   $ 647          
Requested rate increase (decrease) amount $ 730            
Requested revenues increase (decrease) percentage 5.00%            
Return on equity reduction, negative impact on earnings         $ 80   $ 310
Public utilities, approved return on equity percentage         0.00%    
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge, Debt Component              
Public Utilities, General Disclosures [Line Items]              
Remaining net book value       $ 24   24  
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge              
Public Utilities, General Disclosures [Line Items]              
Remaining net book value       30   30  
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge, Equity Component              
Public Utilities, General Disclosures [Line Items]              
Remaining net book value       $ 40   $ 40