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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - Southern - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2024   1,098          
Beginning balance (in shares) at Dec. 31, 2024     (1)        
Beginning balance at Dec. 31, 2024 $ 36,674 $ 5,446 $ (59) $ 14,149 $ 13,750 $ (78) $ 3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,270       1,334   (64)
Other comprehensive income 3         3  
Stock issued (in shares)   2          
Stock issued 85 $ 7   78      
Stock-based compensation 5     5      
Cash dividends (791)       (791)    
Capital contributions from noncontrolling interests 19           19
Distributions to noncontrolling interests (37)           (37)
Other (5)   $ (2) (1) (2)    
Ending balance (in shares) at Mar. 31, 2025   1,100          
Ending balance (in shares) at Mar. 31, 2025     (1)        
Ending balance at Mar. 31, 2025 37,223 $ 5,453 $ (61) 14,231 14,291 (75) 3,384
Beginning balance (in shares) at Dec. 31, 2025   1,120          
Beginning balance (in shares) at Dec. 31, 2025     (1)        
Beginning balance at Dec. 31, 2025 38,867 $ 5,554 $ (59) 15,740 14,856 (75) 2,851
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,338       1,356   (18)
Other comprehensive income 2         2  
Stock issued (in shares)   8          
Stock issued 589 $ 34   555      
Stock-based compensation (9)     (9)      
Cash dividends (830)       (830)    
Capital contributions from noncontrolling interests 4           4
Distributions to noncontrolling interests (46)           (46)
Other (3)   $ (1) (1)     (1)
Ending balance (in shares) at Mar. 31, 2026   1,128          
Ending balance (in shares) at Mar. 31, 2026     (1)        
Ending balance at Mar. 31, 2026 $ 39,912 $ 5,588 $ (60) $ 16,285 $ 15,382 $ (73) $ 2,790