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Derivatives - Schedule of Pre-Tax Effects of Hedging on AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives $ 46 $ (6) $ 65 $ (5)
Cash Flow Hedging | Energy-related derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives (13) 3 6 (5)
Cash Flow Hedging | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 9 1 5 24
Cash Flow Hedging | Foreign currency derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 47 (6) 67 (20)
Fair Value Hedging | Foreign currency derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount excluded from effectiveness testing recognized in earnings 3 (4) (13) (4)
GEORGIA POWER CO | Cash Flow Hedging | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 5 0 3 16
MISSISSIPPI POWER CO | Cash Flow Hedging | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 0 0 0 7
SOUTHERN POWER CO        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 46 (5) 69 (20)
SOUTHERN POWER CO | Cash Flow Hedging | Energy-related derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives (1) 1 2 0
SOUTHERN POWER CO | Cash Flow Hedging | Foreign currency derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives 47 (6) 67 (20)
SOUTHERN Co GAS        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives (8) 3 8 (4)
SOUTHERN Co GAS | Cash Flow Hedging | Energy-related derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives (12) 2 4 (5)
SOUTHERN Co GAS | Cash Flow Hedging | Interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives $ 4 $ 1 $ 4 $ 1