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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - SPC - USD ($)
$ in Millions
Total
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
SOUTHERN POWER CO
SOUTHERN POWER CO
Total Common Stockholder's Equity
SOUTHERN POWER CO
Paid-In Capital
SOUTHERN POWER CO
Retained Earnings
SOUTHERN POWER CO
Accumulated Other Comprehensive Income (Loss)
SOUTHERN POWER CO
Noncontrolling Interests
Beginning balance at Dec. 31, 2023 $ 35,225 $ 13,775 $ 12,482 $ (177) $ 3,781 $ 6,698 $ 2,917 $ 1,088 $ 1,846 $ (17) $ 3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,071   1,129   (58) 38 96   96   (58)
Other comprehensive income 37     37   2 2     2  
Cash dividends on common stock (766)   (766)     (65) (65)   (65)    
Capital contributions from noncontrolling interests 9       9 9         9
Distributions to noncontrolling interests (38)       (38) (38)         (38)
Other 7 10 (1)     (1) (1)   (1)    
Ending balance at Mar. 31, 2024 35,614 13,846 12,844 (140) 3,694 6,643 2,949 1,088 1,876 (15) 3,694
Beginning balance at Dec. 31, 2023 35,225 13,775 12,482 (177) 3,781 6,698 2,917 1,088 1,846 (17) 3,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 3,794         191          
Other comprehensive income 38         1          
Ending balance at Sep. 30, 2024 36,905 14,048 14,005 (139) 3,607 6,602 2,995 1,098 1,913 (16) 3,607
Beginning balance at Mar. 31, 2024 35,614 13,846 12,844 (140) 3,694 6,643 2,949 1,088 1,876 (15) 3,694
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,188   1,203   (15) 71 86   86   (15)
Capital contributions from parent company           8 8 8      
Other comprehensive income 10     10   3 3     3  
Cash dividends on common stock (788)   (788)     (66) (66)   (66)    
Capital contributions from noncontrolling interests 2       2 2         2
Distributions to noncontrolling interests (19)       (19) (19)         (19)
Other 1 3       1 1 1      
Ending balance at Jun. 30, 2024 36,111 13,947 13,259 (130) 3,662 6,643 2,981 1,097 1,896 (12) 3,662
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,535   1,535     82 82   82   0
Capital contributions from parent company           1 1 1      
Other comprehensive income (9)     (9)   (4) (4)     (4)  
Cash dividends on common stock (789)   (789)     (65) (65)   (65)    
Distributions to noncontrolling interests (55)       (55) (55)         (55)
Other 4 (2)                  
Ending balance at Sep. 30, 2024 36,905 14,048 14,005 (139) 3,607 6,602 2,995 1,098 1,913 (16) 3,607
Beginning balance at Dec. 31, 2024 36,674 14,149 13,750 (78) 3,466 6,682 3,216 1,306 1,912 (2) 3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,270   1,334   (64) 23 87   87   (64)
Capital contributions from parent company           130 130 130      
Other comprehensive income 3     3   2 2     2  
Cash dividends on common stock (791)   (791)     (70) (70)   (70)    
Capital contributions from noncontrolling interests 19       19 19         19
Distributions to noncontrolling interests (37)       (37) (37)         (37)
Other (5) (1) (2)                
Ending balance at Mar. 31, 2025 37,223 14,231 14,291 (75) 3,384 6,749 3,365 1,436 1,929 0 3,384
Beginning balance at Dec. 31, 2024 36,674 14,149 13,750 (78) 3,466 6,682 3,216 1,306 1,912 (2) 3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 3,830         46          
Other comprehensive income (1)         (1)          
Ending balance at Sep. 30, 2025 38,274 14,422 15,254 (80) 3,272 6,577 3,305 1,464 1,844 (3) 3,272
Beginning balance at Mar. 31, 2025 37,223 14,231 14,291 (75) 3,384 6,749 3,365 1,436 1,929 0 3,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 853   880   (27) 24 51   51   (27)
Capital contributions from parent company           16 16 16      
Other comprehensive income 4     4   2 2     2  
Cash dividends on common stock (815)   (815)     (69) (69)   (69)    
Capital contributions from noncontrolling interests 4       4 4         4
Distributions to noncontrolling interests (33)       (33) (33)         (33)
Other 6 6 1     (1) (1)   (1)    
Ending balance at Jun. 30, 2025 37,342 14,332 14,357 (71) 3,328 6,692 3,364 1,452 1,910 2 3,328
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,707   1,711   (4) (1) 3   3   (4)
Capital contributions from parent company           12 12 12      
Other comprehensive income (8)     (8)   (5) (5)     (5)  
Cash dividends on common stock (815)   (815)     (70) (70)   (70)    
Distributions to noncontrolling interests (52)       (52) (52)         (52)
Other (4) (10) 1 (1)   1 1   1    
Ending balance at Sep. 30, 2025 $ 38,274 $ 14,422 $ 15,254 $ (80) $ 3,272 $ 6,577 $ 3,305 $ 1,464 $ 1,844 $ (3) $ 3,272