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Condensed Statements of Common Stockholders' Equity (Unaudited) - MPC - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Paid-In Capital
Retained Earnings
Mississippi Power
Mississippi Power
Common Stock
Mississippi Power
Paid-In Capital
Mississippi Power
Retained Earnings
Mississippi Power
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2024   1,098       1      
Beginning balance at Dec. 31, 2024         $ 2,089 $ 38 $ 4,791 $ (2,745) $ 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income $ 1,334       55     55  
Capital contributions from parent company         51   51    
Cash dividends on common stock (791)     $ (791) (48)     (48)  
Other (5)   $ (1) (2) (1)       (1)
Ending balance (in shares) at Mar. 31, 2025   1,100       1      
Ending balance at Mar. 31, 2025         2,146 $ 38 4,842 (2,738) 4
Beginning balance (in shares) at Dec. 31, 2025   1,120       1      
Beginning balance at Dec. 31, 2025         2,189 $ 38 4,871 (2,724) 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 1,356       60     60  
Capital contributions from parent company         90   90    
Cash dividends on common stock (830)     $ (830) (48)     (48)  
Other $ (3)   $ (1)            
Ending balance (in shares) at Mar. 31, 2026   1,128       1      
Ending balance at Mar. 31, 2026         $ 2,291 $ 38 $ 4,961 $ (2,712) $ 4