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REGULATORY MATTERS - MPC Municipal and Rural Associations Tariff (Details) - Mississippi Power - USD ($)
$ in Millions
12 Months Ended
Jun. 25, 2020
Dec. 31, 2021
Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]      
Requested rate increase (decrease), amount $ 2    
Cooperative Energy      
Public Utilities, General Disclosures [Line Items]      
Period of notice to cancel counterparty   10 years  
Counterparty's option to decrease services, percentage     2.50%
Counterparty's option to reduce services, maximum percentage     8.00%
Counterparty's option to reduce services, maximum     $ 8