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INCOME TAXES - NOL Carryforwards (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards $ 298
Mississippi Power | Mississippi  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 189
Southern Power  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 40
Southern Power | Oklahoma  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 27
Southern Power | Florida  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 10
Southern Power | Other states  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 3
Other Subsidiaries | Other states  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 21
Other Subsidiaries | Georgia  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 23
Other Subsidiaries | New York  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards 11
Other Subsidiaries | New York City  
Operating Loss Carryforwards [Line Items]  
Approximate Net State Income Tax Benefit of NOL Carryforwards $ 14