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DERIVATIVES - Derivative Financial Statement Presentation and Amounts With Balance Sheet Offsetting (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | $ 89 | $ 55
Derivative asset, gross amount offset | (44) | (23)
Derivative asset, net amounts recognized in the balance sheets | 45 | 32
Derivative liability, gross amounts recognized | 615 | 744
Derivative liability, gross amounts offset | $ (61) | $ (85)
Derivative Liability 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)
Derivative liability, gross amounts recognized in balance sheets | $ 554 | $ 659
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 | $ 17 | $ 62
Not Designated as Hedging Instrument |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | 6 | 9
Derivative liability, gross amounts recognized | 3 | 10
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
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 | 2
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 | 5 | 8
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 | 3 | 8
Interest rate derivatives |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative liability, gross amounts recognized in balance sheets | 72 |
Alabama Power |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amount offset | (19) | (10)
Derivative asset, net amounts recognized in the balance sheets | 7 | 5
Derivative liability, gross amounts offset | (19) | (10)
Derivative liability, gross amounts recognized in balance sheets | 23 | 100
Collateral already posted, aggregate fair value | 0 |
Georgia Power |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | 19 | 13
Derivative asset, gross amount offset | (15) | (11)
Derivative asset, net amounts recognized in the balance sheets | 4 | 2
Derivative liability, gross amounts recognized | 42 | 124
Derivative liability, gross amounts offset | (15) | (11)
Derivative liability, gross amounts recognized in balance sheets | 27 | 113
Georgia Power | Not Designated as Hedging Instrument |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | 0 | 1
Derivative liability, gross amounts recognized | 1 | 0
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 | 0 | 1
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 | 0
Georgia 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 | 1 | 0
Georgia 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 | 0
Mississippi Power |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amount offset | (17) | (14)
Derivative asset, net amounts recognized in the balance sheets | 2 | 1
Derivative liability, gross amounts offset | (17) | (14)
Derivative liability, gross amounts recognized in balance sheets | 17 | 47
Southern Power |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, net amounts recognized in the balance sheets | 4 | 3
Derivative liability, gross amounts recognized in balance sheets | 51 | 27
Collateral already posted, aggregate fair value | 0 |
Southern Power | Interest rate derivatives |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative liability, gross amounts recognized in balance sheets | 24 |
Southern Company Gas |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | 21 | 9
Derivative asset, gross amount offset | 7 | 12
Derivative asset, net amounts recognized in the balance sheets | 28 | 21
Derivative liability, gross amounts recognized | 94 | 137
Derivative liability, gross amounts offset | (10) | (50)
Derivative liability, gross amounts recognized in balance sheets | 84 | 87
Collateral already posted, aggregate fair value | 17 | 62
Southern Company Gas | Not Designated as Hedging Instrument |  |
Fair value of energy-related derivatives and interest rate derivatives |  |
Derivative asset, gross amounts recognized | 6 | 8
Derivative liability, gross amounts recognized | 2 | 10
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 | 0 | 2
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 | 5 | 7
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 | 2 | 8
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 | 75 | 43
Derivative liability, gross amounts recognized | 122 | 315
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 | 42 | 31
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 | 40 | 117
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 | 33 | 12
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 | 82 | 198
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 | 26 | 15
Derivative liability, gross amounts recognized | 42 | 110
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 | 15 | 9
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 | 12 | 41
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 | 30 | 69
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 | 11 | 6
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 | 19 | 12
Derivative liability, gross amounts recognized | 41 | 124
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 | 13 | 10
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 | 9 | 42
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 | 32 | 82
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 | 6 | 2
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 | 19 | 15
Derivative liability, gross amounts recognized | 34 | 61
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 | 14 | 12
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 | 19 | 34
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 | 15 | 27
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 | 5 | 3
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 | 1 | 0
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 | 0 | 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 | 11 | 1
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 | 5 | 20
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 | 8 | 3
Derivative liability, gross amounts recognized | 490 | 419
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 | 4 | 3
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 | 0 | 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 | 4 | 0
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 | 3 | 29
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 | 208 | 190
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 | 0
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 | 61 | 74
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 | 182 | 88
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 | 36 | 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 | 4 | 3
Derivative liability, gross amounts recognized | 51 | 27
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 | 3
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 | 0 | 5
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 | 1 | 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 | 40 | 11
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 | 4 | 0
Derivative liability, gross amounts recognized | 87 | 107
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 | 3 | 0
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 | 3 | 24
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 | 67 | 59
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 | $ 17 | $ 20

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