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Acquisitions and Dispositions (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
MW
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]    
Construction work in progress | $ $ 5,231 $ 7,784
SOUTHERN POWER CO    
Business Acquisition [Line Items]    
Construction work in progress | $ $ 134 $ 278
SOUTHERN POWER CO | South Cheyenne Solar Facility    
Business Acquisition [Line Items]    
Nameplate capacity placed in service (in MWs) 150  
Approximate nameplate capacity 150  
Life output of plant (in years) 20 years  
SOUTHERN POWER CO | Millers Branch Solar Development    
Business Acquisition [Line Items]    
Construction work in progress | $ $ 117  
SOUTHERN POWER CO | Millers Branch Solar Development Phase 1    
Business Acquisition [Line Items]    
Approximate nameplate capacity 200  
Life output of plant (in years) 20 years  
SOUTHERN POWER CO | Millers Branch Solar Development Phase 2    
Business Acquisition [Line Items]    
Approximate nameplate capacity 180  
Life output of plant (in years) 15 years  
SOUTHERN POWER CO | Millers Branch Solar Development Phase 3    
Business Acquisition [Line Items]    
Approximate nameplate capacity 90  
Life output of plant (in years) 15 years  
SOUTHERN POWER CO | Maximum | Millers Branch Solar Development    
Business Acquisition [Line Items]    
Approximate nameplate capacity 500