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REGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details) - Mississippi Power
$ in Millions
1 Months Ended
Dec. 23, 2024
USD ($)
Oct. 25, 2024
USD ($)
May 28, 2024
USD ($)
Jul. 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
Dec. 31, 2024
MW
Aug. 31, 2022
Public Utilities, General Disclosures [Line Items]              
Requested rate increase (decrease), amount   $ 11          
Municipal and Rural Associations Tariff              
Public Utilities, General Disclosures [Line Items]              
Counterparty's option to decrease services, percentage 2.50%            
Requested rate increase (decrease), amount $ 1   $ 8 $ 16 $ 23    
Refund to customers $ 4     $ 6      
Cooperative Energy              
Public Utilities, General Disclosures [Line Items]              
Counterparty's option to decrease services, percentage             2.50%
Power being supplied to counterparty | MW           385  
Counterparty's electricity requirement at MRA delivery points           100.00%