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Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - GEORGIA POWER CO - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2024
Apr. 29, 2024
Aug. 01, 2023
Nov. 30, 2021
Jun. 30, 2024
Mar. 31, 2024
Mar. 31, 2022
Dec. 31, 2023
Scenario, Forecast                
Public Utilities, General Disclosures [Line Items]                
Return on equity reduction, negative impact on earnings         $ 10      
Plant Vogtle Units 3 And 4                
Public Utilities, General Disclosures [Line Items]                
Approved rate increase (decrease)             $ 2,100  
Approved recovery of retail rate items       $ 362        
Return on equity reduction, negative impact on earnings           $ 60   $ 310
Pre-tax charge to income           567    
Plant Vogtle Units 3 And 4 | Subsequent Event                
Public Utilities, General Disclosures [Line Items]                
Approved rate increase (decrease)   $ 5,462            
Associated retail rate base items   $ 647            
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge, Debt Component                
Public Utilities, General Disclosures [Line Items]                
Remaining net book value           22    
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge                
Public Utilities, General Disclosures [Line Items]                
Remaining net book value           28    
Plant Vogtle Units 3 And 4 | Deferred Income Tax Charge, Equity Component                
Public Utilities, General Disclosures [Line Items]                
Remaining net book value           $ 38    
Plant Vogtle Units 3 And 4 | Scenario, Forecast                
Public Utilities, General Disclosures [Line Items]                
Return on equity reduction, negative impact on earnings         $ 20      
Requested rate increase (decrease) amount $ 730              
Requested revenues increase (decrease) percentage 5.00%              
Plant Vogtle Unit 3                
Public Utilities, General Disclosures [Line Items]                
Requested rate increase, annual amount     $ 318