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Contingencies - Other Matters (Details)
12 Months Ended 60 Months Ended
Jul. 12, 2022
USD ($)
claim
Dec. 31, 2019
USD ($)
Jan. 15, 2024
USD ($)
Plant Daniel Unit, Primary | MISSISSIPPI POWER CO | Subsequent Event      
Loss Contingencies [Line Items]      
Plant units | claim 1    
Plant Daniel Units 1 And 2 | GULF POWER CO | Subsequent Event      
Loss Contingencies [Line Items]      
Percent ownership in individual unit 100.00%    
Plant Daniel Units 1 And 2 | MISSISSIPPI POWER CO | Subsequent Event      
Loss Contingencies [Line Items]      
Plant units | claim 2    
Scenario, Forecast | Plant Daniel Units 1 And 2 | MISSISSIPPI POWER CO      
Loss Contingencies [Line Items]      
Payments to acquire businesses     $ 1
Business combination, option to purchase, period     120 days
Disposal Group, Disposed of by Sale | GULF POWER CO      
Loss Contingencies [Line Items]      
Proceeds from divestiture of businesses, amount held back   $ 75,000,000  
Disposal Group, Disposed of by Sale | GULF POWER CO | Subsequent Event      
Loss Contingencies [Line Items]      
Proceeds from divestiture of businesses, amount held back $ 75,000,000