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Derivatives - Schedule of Pre-tax Effects of Unrealized Derivative Gains (Losses) (Details) - Energy-related derivatives - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) $ (177) $ 9
Other regulatory assets, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (141) (71)
Other regulatory assets, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (71) (23)
Other regulatory liabilities, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 29 72
Other regulatory liabilities, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 6 31
ALABAMA POWER CO    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (52) 23
ALABAMA POWER CO | Other regulatory assets, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (37) (8)
ALABAMA POWER CO | Other regulatory assets, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (27) (7)
ALABAMA POWER CO | Other regulatory liabilities, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 11 29
ALABAMA POWER CO | Other regulatory liabilities, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 1 9
GEORGIA POWER CO    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (87) (19)
GEORGIA POWER CO | Other regulatory assets, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (60) (26)
GEORGIA POWER CO | Other regulatory assets, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (30) (14)
GEORGIA POWER CO | Other regulatory liabilities, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 2 19
GEORGIA POWER CO | Other regulatory liabilities, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 1 2
MISSISSIPPI POWER CO    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (28) 27
MISSISSIPPI POWER CO | Other regulatory assets, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (22) (13)
MISSISSIPPI POWER CO | Other regulatory assets, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (14) (2)
MISSISSIPPI POWER CO | Other regulatory liabilities, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 4 22
MISSISSIPPI POWER CO | Other regulatory liabilities, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 4 20
SOUTHERN Co GAS    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (10) (22)
SOUTHERN Co GAS | Other regulatory assets, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) (22) (24)
SOUTHERN Co GAS | Other regulatory assets, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 0 0
SOUTHERN Co GAS | Other regulatory liabilities, current    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) 12 2
SOUTHERN Co GAS | Other regulatory liabilities, deferred    
Derivative Instruments, Gain (Loss) [Line Items]    
Total energy-related derivative gains (losses) $ 0 $ 0