v3.25.0.1
REGULATORY MATTERS - GPC Regulatory Matters (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 192 Months Ended
May 01, 2024
Aug. 01, 2023
Apr. 30, 2024
May 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2009
Dec. 31, 2024
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets             $ 6,523.0 $ 7,041.0 $ 6,523.0       $ 7,041.0
Regulatory asset amortization period               4 years         4 years
Deferred Income Tax Charges                          
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets             897.0 $ 927.0 897.0       $ 927.0
Georgia Power                          
Public Utilities, General Disclosures [Line Items]                          
Requested recovery of construction costs           $ 10.0   760.0          
Requested rate increase (decrease), amount       $ 1,100.0           $ 14,000.0      
Net regulatory assets             5,090.0 6,139.0 5,090.0       6,139.0
Pre-tax charge to income           7.6     567.0        
After tax charge to income           5.7     424.0        
Requested rate increase (decrease), percentage       54.00%                  
Georgia Power | Deferred Income Tax Charges                          
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets             605.0 $ 634.0 605.0       634.0
Plant Vogtle Units 3 and 4 | Georgia Power                          
Public Utilities, General Disclosures [Line Items]                          
Estimated in-service capital cost                       $ 4,418.0  
Proceeds from recovery of financing costs                         $ 3,080.0
Requested recovery of construction costs                       7,562.0  
Increase (decrease) in tariff         $ 36.0                
Public utilities, approved rate increase (decrease), amount                     $ 2,100.0 5,462.0  
Requested rate increase (decrease), amount                       730.0  
Regulatory asset amortization period               10 years         10 years
Requested recovery of rate base items                       1,020.0  
Approved recovery of retail base rate                     362.0    
Requested recovery of remaining retail rate base items                       $ 647.0  
Return on equity reduction, negative impact on earnings     $ 10.0     $ 80.0     $ 310.0 $ 300.0      
Pre-tax charge to income             228.0            
After tax charge to income             $ 170.0            
Authorized ROE           0.00%              
Requested rate increase (decrease), percentage 5.00%                        
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charge, Debt Component                          
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets               $ 23.0         $ 23.0
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charges                          
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets               $ 29.0         $ 29.0
Regulatory asset amortization period               10 years         10 years
Plant Vogtle Units 3 and 4 | Georgia Power | Deferred Income Tax Charge, Equity Component                          
Public Utilities, General Disclosures [Line Items]                          
Net regulatory assets               $ 39.0         $ 39.0
Plant Vogtle Units 3 and 4 | Georgia Power                          
Public Utilities, General Disclosures [Line Items]                          
Public utilities, approved rate increase (decrease), amount                     2,100.0    
Requested rate increase (decrease), amount                     $ 3,600.0    
Requested rate increase, annual amount   $ 318.0