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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 (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Mississippi Power
Mississippi Power
Common Stock
Mississippi Power
Paid-In Capital
Mississippi Power
Retained Earnings (Accumulated Deficit)
Mississippi Power
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2023             1      
Beginning balance at Dec. 31, 2023           $ 2,003 $ 38 $ 4,721 $ (2,756) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income           50     50  
Capital contributions from parent company           1   1    
Other comprehensive income           5       5
Cash dividends on common stock $ (766)     $ (766)   (47)     (47)  
Other 7   $ 10 (1)            
Ending balance (in shares) at Mar. 31, 2024             1      
Ending balance at Mar. 31, 2024           2,012 $ 38 4,722 (2,753) 5
Beginning balance (in shares) at Dec. 31, 2023             1      
Beginning balance at Dec. 31, 2023           2,003 $ 38 4,721 (2,756) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 3,867         186        
Other comprehensive income           5        
Ending balance (in shares) at Sep. 30, 2024             1      
Ending balance at Sep. 30, 2024           2,115 $ 38 4,783 (2,711) 5
Beginning balance (in shares) at Mar. 31, 2024             1      
Beginning balance at Mar. 31, 2024           2,012 $ 38 4,722 (2,753) 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income           61     61  
Capital contributions from parent company           58   58    
Cash dividends on common stock (788)     (788)   (47)     (47)  
Other 1   3              
Ending balance (in shares) at Jun. 30, 2024             1      
Ending balance at Jun. 30, 2024           2,084 $ 38 4,780 (2,739) 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,535         75     75  
Capital contributions from parent company           3   3    
Other comprehensive income           0        
Cash dividends on common stock (789)     (789)   (47)     (47)  
Other 4   (2)              
Ending balance (in shares) at Sep. 30, 2024             1      
Ending balance at Sep. 30, 2024           2,115 $ 38 4,783 (2,711) 5
Beginning balance (in shares) at Dec. 31, 2024             1      
Beginning balance at Dec. 31, 2024           2,089 $ 38 4,791 (2,745) 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income           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      
Ending balance at Mar. 31, 2025           2,146 $ 38 4,842 (2,738) 4
Beginning balance (in shares) at Dec. 31, 2024             1      
Beginning balance at Dec. 31, 2024           2,089 $ 38 4,791 (2,745) 5
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 3,925         198        
Other comprehensive income           0        
Ending balance (in shares) at Sep. 30, 2025             1      
Ending balance at Sep. 30, 2025           2,200 $ 38 4,850 (2,692) 4
Beginning balance (in shares) at Mar. 31, 2025             1      
Beginning balance at Mar. 31, 2025           2,146 $ 38 4,842 (2,738) 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income           59     59  
Capital contributions from parent company           7   7    
Cash dividends on common stock (815)     (815)   (49)     (49)  
Other 6   6 1   1     1  
Ending balance (in shares) at Jun. 30, 2025             1      
Ending balance at Jun. 30, 2025           2,164 $ 38 4,849 (2,727) 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,711         84     84  
Capital contributions from parent company           1   1    
Other comprehensive income           0        
Cash dividends on common stock (815)     (815)   (48)     (48)  
Other $ (4) $ 1 $ (10) $ 1 $ (1) (1)     (1)  
Ending balance (in shares) at Sep. 30, 2025             1      
Ending balance at Sep. 30, 2025           $ 2,200 $ 38 $ 4,850 $ (2,692) $ 4