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CONTINGENCIES, COMMITMENTS, AND GUARANTEES - MPC Other Matters (Details) - USD ($)
1 Months Ended 60 Months Ended
Jan. 01, 2019
May 31, 2018
Jan. 15, 2024
Mississippi Power | Deepwater Horizon Oil Spill Litigation Case      
Loss Contingencies [Line Items]      
Litigation settlement   $ 18,000,000  
Scenario, Forecast | Plant Daniel | Mississippi Power      
Loss Contingencies [Line Items]      
Payments to acquire businesses     $ 1
Business Combination, Option To Purchase, Period     120 days
Scenario, Forecast | Plant Daniel | Gulf Power      
Loss Contingencies [Line Items]      
Percent ownership     50.00%
Percent ownership in individual unit     100.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gulf Power      
Loss Contingencies [Line Items]      
Proceeds from divestiture of businesses, amount held back $ 75,000,000