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Derivatives - Schedule of Derivative Category and Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized $ 68 $ 55
Derivative asset, Gross amounts offset (38) (23)
Derivative asset, net amounts recognized in the balance sheets 30 32
Derivative liability, gross amount recognized 704 744
Derivative liability, Gross amounts offset (62) (85)
Derivative liability, net amounts recognized in the balance sheets 642 659
Collateral already posted, assets, aggregate fair value 24  
Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liability, net amounts recognized in the balance sheets 65  
Energy-related derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 2 9
Derivative liability, gross amount recognized 2 10
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 8
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Liabilities from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 2 8
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 1
Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 0 2
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 60 43
Derivative liability, gross amount recognized 214 315
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 26 12
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Liabilities from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 139 198
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 34 31
Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 75 117
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 6 3
Derivative liability, gross amount recognized 488 419
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Liabilities from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 13 29
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 4 3
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 1 4
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Liabilities from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 77 74
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 219 190
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Liabilities from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 35 34
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 143 88
ALABAMA POWER CO    
Derivatives, Fair Value [Line Items]    
Derivative asset, Gross amounts offset (13) (10)
Derivative asset, net amounts recognized in the balance sheets 9 5
Derivative liability, Gross amounts offset (13) (10)
Derivative liability, net amounts recognized in the balance sheets 60 100
Collateral already posted, assets, aggregate fair value 0  
ALABAMA POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0  
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 22 15
Derivative liability, gross amount recognized 73 110
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 12 6
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 48 69
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 10 9
ALABAMA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 25 41
GEORGIA POWER CO    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 14 13
Derivative asset, Gross amounts offset (13) (11)
Derivative asset, net amounts recognized in the balance sheets 1 2
Derivative liability, gross amount recognized 78 124
Derivative liability, Gross amounts offset (13) (11)
Derivative liability, net amounts recognized in the balance sheets 65 113
GEORGIA POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 1
GEORGIA POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 0 0
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 14 12
Derivative liability, gross amount recognized 78 124
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 3 2
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 56 82
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 11 10
GEORGIA POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 22 42
MISSISSIPPI POWER CO    
Derivatives, Fair Value [Line Items]    
Derivative asset, Gross amounts offset (15) (14)
Derivative asset, net amounts recognized in the balance sheets 1 1
Derivative liability, Gross amounts offset (15) (14)
Derivative liability, net amounts recognized in the balance sheets 32 47
MISSISSIPPI POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0  
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 16 15
Derivative liability, gross amount recognized 47 61
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Assets from risk management activities    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 4 3
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 21 27
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 12 12
MISSISSIPPI POWER CO | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 26 34
SOUTHERN POWER CO    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 4 3
Derivative asset, net amounts recognized in the balance sheets 4 3
Derivative liability, gross amount recognized 33 27
Derivative liability, net amounts recognized in the balance sheets 33 27
SOUTHERN POWER CO | Energy-related derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liability, net amounts recognized in the balance sheets 0  
SOUTHERN POWER CO | Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liability, net amounts recognized in the balance sheets 15  
SOUTHERN POWER CO | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 4 3
Derivative liability, gross amount recognized 33 27
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 3 5
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 4 3
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 0 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 10 11
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN POWER CO | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Foreign currency derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 20 11
SOUTHERN Co GAS    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 12 9
Derivative asset, Gross amounts offset 3 12
Derivative asset, net amounts recognized in the balance sheets 15 21
Derivative liability, gross amount recognized 118 137
Derivative liability, Gross amounts offset (21) (50)
Derivative liability, net amounts recognized in the balance sheets 97 87
Collateral already posted, assets, aggregate fair value 24 62
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 2 8
Derivative liability, gross amount recognized 2 10
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 7
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 2 8
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 1
SOUTHERN Co GAS | Energy-related derivatives not designated as hedging instruments | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 0 2
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 8 1
Derivative liability, gross amount recognized 16 20
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 7 1
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 14 20
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 0
SOUTHERN Co GAS | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 2 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 2 0
Derivative liability, gross amount recognized 100 107
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 10 24
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Energy-related derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 1 4
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 1 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized 20 20
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred charges and assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amount recognized 0 0
SOUTHERN Co GAS | Derivatives designated as hedging instruments in cash flow and fair value hedges | Energy-related derivatives designated as hedging instruments for regulatory purposes | Interest rate derivatives | Other deferred credits and liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized $ 69 $ 59