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Condensed Statements of Common Stockholders' Equity (Unaudited) - APC - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Paid-In Capital
Retained Earnings
Alabama Power
Alabama Power
Common Stock
Alabama Power
Paid-In Capital
Alabama Power
Retained Earnings
Alabama Power
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2024   1,098       31      
Beginning balance at Dec. 31, 2024         $ 13,088 $ 1,222 $ 7,657 $ 4,214 $ (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income $ 1,334       375     375  
Capital contributions from parent company         527   527    
Other comprehensive income         1       1
Cash dividends on common stock (791)     $ (791) (305)     (305)  
Other (5)   $ (1) (2) (1)       (1)
Ending balance (in shares) at Mar. 31, 2025   1,100       31      
Ending balance at Mar. 31, 2025         13,685 $ 1,222 8,184 4,284 (5)
Beginning balance (in shares) at Dec. 31, 2025   1,120       31      
Beginning balance at Dec. 31, 2025         13,994 $ 1,222 8,263 4,512 (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 1,356       425     425  
Capital contributions from parent company         226   226    
Other comprehensive income         0        
Cash dividends on common stock (830)     $ (830) (301)     (301)  
Other $ (3)   $ (1)            
Ending balance (in shares) at Mar. 31, 2026   1,128       31      
Ending balance at Mar. 31, 2026         $ 14,344 $ 1,222 $ 8,489 $ 4,636 $ (3)