v3.25.0.1
ACQUISITIONS AND DISPOSITIONS - Southern Power Narrative (Details) - SOUTHERN POWER CO
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2024
MW
Dec. 31, 2024
USD ($)
MW
Dec. 31, 2023
USD ($)
Kay Wind Facility      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW) 299    
PPA Contract Period 20 years    
Nameplate Capacity, Amount Repowered 200    
South Cheyenne Solar Facility      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)   150  
PPA Contract Period   20 years  
Millers Branch Solar Development Phase 1      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)   200  
PPA Contract Period   20 years  
Millers Branch Solar Development Phase 2      
Asset Acquisition [Line Items]      
Approximate Nameplate Capacity (MW)   180  
PPA Contract Period   15 years  
Millers Branch      
Asset Acquisition [Line Items]      
Cost of construction | $   $ 292  
South Cheyenne Solar Facility and Millers Branch Solar Development      
Asset Acquisition [Line Items]      
Payments to acquire businesses | $     $ 193