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DERIVATIVES - Derivative Financial Statement Presentation and Amounts With Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized $ 55 $ 211
Derivative asset, gross amount offset (23) (70)
Derivative asset, net amounts recognized in the balance sheets 32 141
Derivative liability, gross amounts recognized 744 728
Derivative liability, gross amounts offset (85) (111)
Derivative liability, gross amounts recognized in balance sheets $ 659 $ 617
Derivative asset, statement of financial position, extensible enumeration, not disclosed, flag Net amounts recognized in the Balance Sheets(b) Net amounts recognized in the Balance Sheets(b)
Collateral already posted, aggregate fair value $ 62  
Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 9 $ 15
Derivative liability, gross amounts recognized 10 14
Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 1 2
Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 2 1
Energy-related derivatives | Assets from risk management activities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 8 13
Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 8 13
Interest rate derivatives    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized in balance sheets 52  
Alabama Power    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amount offset (10) (24)
Derivative asset, net amounts recognized in the balance sheets 5 38
Derivative liability, gross amounts offset (10) (24)
Derivative liability, gross amounts recognized in balance sheets 100 15
Collateral already posted, aggregate fair value 0  
Georgia Power    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 13 42
Derivative asset, gross amount offset (11) (21)
Derivative asset, net amounts recognized in the balance sheets 2 21
Derivative liability, gross amounts recognized 124 62
Derivative liability, gross amounts offset (11) (21)
Derivative liability, gross amounts recognized in balance sheets 113 41
Georgia Power | Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 1 0
Georgia Power | Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 0 1
Mississippi Power    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amount offset (14) (17)
Derivative asset, net amounts recognized in the balance sheets 1 42
Derivative liability, gross amounts offset (14) (17)
Derivative liability, gross amounts recognized in balance sheets 47 15
Southern Power    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, net amounts recognized in the balance sheets 3 8
Derivative liability, gross amounts recognized in balance sheets 27 59
Collateral already posted, aggregate fair value 0  
Southern Power | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 3
Derivative liability, gross amounts recognized 0 0
Southern Power | Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 0 0
Southern Power | Energy-related derivatives | Other current assets | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 2
Southern Power | Interest rate derivatives    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized in balance sheets 0  
Southern Company Gas    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 9 28
Derivative asset, gross amount offset 12 0
Derivative asset, net amounts recognized in the balance sheets 21 28
Derivative liability, gross amounts recognized 137 151
Derivative liability, gross amounts offset (50) (41)
Derivative liability, gross amounts recognized in balance sheets 87 110
Collateral already posted, aggregate fair value 62 41
Southern Company Gas | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 8 12
Derivative liability, gross amounts recognized 10 13
Southern Company Gas | Energy-related derivatives | Other deferred charges and assets | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 1 1
Southern Company Gas | Energy-related derivatives | Other deferred credits and liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 2 1
Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 7 11
Southern Company Gas | Energy-related derivatives | Other current liabilities | Not Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 8 12
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 43 175
Derivative liability, gross amounts recognized 315 165
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 31 52
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 117 44
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 12 123
Hedging Instruments for Regulatory Purposes | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 198 121
Hedging Instruments for Regulatory Purposes | Alabama Power | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 15 62
Derivative liability, gross amounts recognized 110 39
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 9 20
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 41 18
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 69 21
Hedging Instruments for Regulatory Purposes | Alabama Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 6 42
Hedging Instruments for Regulatory Purposes | Georgia Power | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 12 42
Derivative liability, gross amounts recognized 124 61
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 10 6
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 42 18
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 82 43
Hedging Instruments for Regulatory Purposes | Georgia Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 2 36
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 15 59
Derivative liability, gross amounts recognized 61 32
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 12 26
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 34 8
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 27 24
Hedging Instruments for Regulatory Purposes | Mississippi Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 3 33
Hedging Instruments for Regulatory Purposes | Southern Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 1
Hedging Instruments for Regulatory Purposes | Southern Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 0 0
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 1
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 4 4
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 1 12
Hedging Instruments for Regulatory Purposes | Southern Company Gas | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 20 33
Cash Flow and Fair Value Hedging | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 3 21
Derivative liability, gross amounts recognized 419 549
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 3 6
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 4 4
Cash Flow and Fair Value Hedging | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 3
Cash Flow and Fair Value Hedging | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 29 27
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 190 240
Cash Flow and Fair Value Hedging | Interest rate derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 12
Cash Flow and Fair Value Hedging | Interest rate derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 74 62
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 88 182
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Foreign currency derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 34 34
Cash Flow and Fair Value Hedging | Southern Power | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 3 5
Derivative liability, gross amounts recognized 27 59
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 3 5
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 5 12
Cash Flow and Fair Value Hedging | Southern Power | Energy-related derivatives | Other current assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 11 36
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 11 11
Cash Flow and Fair Value Hedging | Southern Power | Foreign currency derivatives | Other current assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 4
Derivative liability, gross amounts recognized 107 105
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 3
Cash Flow and Fair Value Hedging | Southern Company Gas | Energy-related derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 24 15
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other deferred charges and assets | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other deferred credits and liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized 59 72
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Assets from risk management activities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative asset, gross amounts recognized 0 0
Cash Flow and Fair Value Hedging | Southern Company Gas | Interest rate derivatives | Other current liabilities | Designated as Hedging Instrument    
Fair value of energy-related derivatives and interest rate derivatives    
Derivative liability, gross amounts recognized $ 20 $ 14