v3.26.3
Consolidated Statement of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Other Paid-in Capital:
Retained Earnings:
Derivative Financial Instruments
Deferred Retirement Benefit Costs
Accumulated Other Comprehensive Income (Loss):
Total Shareholders’ Equity
Noncontrolling Interests:
Union Electric Company
Union Electric Company
Common Stock
Union Electric Company
Other Paid-in Capital:
Union Electric Company
Preferred Stock
Union Electric Company
Retained Earnings:
Ameren Illinois Company
Ameren Illinois Company
Common Stock
Ameren Illinois Company
Other Paid-in Capital:
Ameren Illinois Company
Preferred Stock
Ameren Illinois Company
Retained Earnings:
Beginning of period at Dec. 31, 2024     $ 7,513 $ 4,604 $ 3 $ (9)     $ 129     $ 3,201   $ 4,206         $ 4,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     35                                
Stock-based compensation activity     11                                
Capital contributions from parent                   $ 0   0              
Net income $ 1,208                 713         $ 522        
Net Income Available to Common Shareholder       1,204                     521        
Dividends on common stock       (576)                   (125)         (185)
Dividends on preferred stock                           (3)         (1)
Change in derivative financial instruments         (6)                            
Change in deferred retirement benefit costs (2)         (2)                          
Net income attributable to noncontrolling interest holders $ (4)               4                    
Dividends paid to noncontrolling interest holders                 (4)                    
Common stock shares outstanding at beginning of period at Dec. 31, 2024 269,900,000                                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 300,000                                    
Shares issued for stock-based compensation 300,000                                    
Common stock shares outstanding at end of period at Sep. 30, 2025 270,500,000                                    
End of period at Sep. 30, 2025 $ 12,909 $ 3 7,559 5,232 (3) (11) $ (14)   129   $ 511 3,201 $ 80 4,791   $ 0 $ 3,056 $ 49 4,602
Shareholders' equity, end of year at Sep. 30, 2025               $ 12,780   8,583         7,707        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 2.13                                    
Beginning of period at Jun. 30, 2025     7,541 4,784 (3) (11)     129     3,201   4,348         4,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     10                                
Stock-based compensation activity     8                                
Capital contributions from parent                       0              
Net income $ 641                 519         148        
Net Income Available to Common Shareholder       640                     148        
Dividends on common stock       (192)                   (75)         (110)
Dividends on preferred stock                           (1)         0
Change in derivative financial instruments         0                            
Change in deferred retirement benefit costs 0         0                          
Net income attributable to noncontrolling interest holders $ (1)               1                    
Dividends paid to noncontrolling interest holders                 (1)                    
Common stock shares outstanding at beginning of period at Jun. 30, 2025 270,400,000                                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 100,000                                    
Shares issued for stock-based compensation 0                                    
Common stock shares outstanding at end of period at Sep. 30, 2025 270,500,000                                    
End of period at Sep. 30, 2025 $ 12,909 3 7,559 5,232 (3) (11) (14)   129   511 3,201 80 4,791   0 3,056 49 4,602
Shareholders' equity, end of year at Sep. 30, 2025               12,780   $ 8,583         $ 7,707        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.71                                    
Beginning of period at Dec. 31, 2025 $ 13,530   8,106 5,292 6 (6)     129     3,229   4,757         4,736
Common stock shares outstanding at beginning of period at Dec. 31, 2025 276,400,000                 102,100,000         25,500,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued for stock-based compensation 200,000                                    
Common stock shares outstanding at end of period at Jun. 30, 2026 276,800,000                                    
End of period at Jun. 30, 2026     8,132 5,549 10 (7)     129     3,654   4,990         4,874
Beginning of period at Dec. 31, 2025 $ 13,530   8,106 5,292 6 (6)     129     3,229   4,757         4,736
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     30                                
Stock-based compensation activity     13                                
Capital contributions from parent                   $ 550   550              
Net income 1,351                 $ 818         $ 548        
Net Income Available to Common Shareholder       1,347                     $ 547        
Dividends on common stock       (622)                   0         (265)
Dividends on preferred stock                           (3)         (1)
Change in derivative financial instruments         38                            
Change in deferred retirement benefit costs 0         0                          
Net income attributable to noncontrolling interest holders $ (4)               4                    
Dividends paid to noncontrolling interest holders                 (4)                    
Common stock shares outstanding at beginning of period at Dec. 31, 2025 276,400,000                 102,100,000         25,500,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 300,000                                    
Shares issued for stock-based compensation 200,000                                    
Common stock shares outstanding at end of period at Sep. 30, 2026 276,900,000                 102,100,000         25,500,000        
End of period at Sep. 30, 2026 $ 14,336 3 8,149 6,017 44 (6) 38   129   511 3,779 80 5,572   0 3,058 49 5,018
Shareholders' equity, end of year at Sep. 30, 2026 $ 14,207             14,207   $ 9,942         $ 8,125        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 2.25                                    
Beginning of period at Jun. 30, 2026     8,132 5,549 10 (7)     129     3,654   4,990         4,874
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     8                                
Stock-based compensation activity     9                                
Capital contributions from parent                   125   125              
Net income $ 677                 $ 583         144        
Net Income Available to Common Shareholder       676                     $ 144        
Dividends on common stock       (208)                   0         0
Dividends on preferred stock                           (1)         0
Change in derivative financial instruments         34                            
Change in deferred retirement benefit costs 1         1                          
Net income attributable to noncontrolling interest holders $ (1)               1                    
Dividends paid to noncontrolling interest holders                 (1)                    
Common stock shares outstanding at beginning of period at Jun. 30, 2026 276,800,000                                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 100,000                                    
Shares issued for stock-based compensation 0                                    
Common stock shares outstanding at end of period at Sep. 30, 2026 276,900,000                 102,100,000         25,500,000        
End of period at Sep. 30, 2026 $ 14,336 $ 3 $ 8,149 $ 6,017 $ 44 $ (6) $ 38   $ 129   $ 511 $ 3,779 $ 80 $ 5,572   $ 0 $ 3,058 $ 49 $ 5,018
Shareholders' equity, end of year at Sep. 30, 2026 $ 14,207             $ 14,207   $ 9,942         $ 8,125        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.75