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Regulatory Matters - GPC Amendments to the Vogtle Joint Ownership Agreements (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 01, 2024
Oct. 31, 2023
Sep. 30, 2022
Mar. 31, 2024
Mar. 07, 2024
Public Utilities, General Disclosures [Line Items]          
Agreement with third party, amount of costs over projected forecast to be paid by company     20.00%    
Southern Co and Georgia Power | Disposal Group, Held-for-sale, Not Discontinued Operations          
Public Utilities, General Disclosures [Line Items]          
Assets held for sale         $ 230
Southern Co and Georgia Power | Subsequent Event | Disposal Group, Held-for-sale, Not Discontinued Operations          
Public Utilities, General Disclosures [Line Items]          
Proceeds from sale of transmission assets $ 341        
Gain (loss) on sale 110        
Gain (loss) on sale, after tax $ 81        
Plant Vogtle Units 3 And 4 | GEORGIA POWER CO          
Public Utilities, General Disclosures [Line Items]          
Preliminary estimated cost to complete       $ 10,753  
Remaining share of construction costs, agreement to pay, percentage   66.00%      
Pre-tax charge to income       $ 567  
Plant Vogtle Units 3 And 4 | GEORGIA POWER CO | MEAG Power          
Public Utilities, General Disclosures [Line Items]          
Payment of power costs     $ 92    
Plant Vogtle Units 3 And 4 | GEORGIA POWER CO | Oglethorpe Power Corporation          
Public Utilities, General Disclosures [Line Items]          
Additional construction capital costs   $ 308      
Payment of power costs   105      
Plant Vogtle Units 3 And 4 | GEORGIA POWER CO | Dalton Utilities          
Public Utilities, General Disclosures [Line Items]          
Additional construction capital costs   17      
Payment of power costs   $ 6