v3.26.1
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     25                                
Stock-based compensation activity     3                                
Capital contributions from parent                   $ 0   0              
Net income $ 567                 194         $ 374        
Net Income Available to Common Shareholder       564                     373        
Dividends on common stock       (384)                   (50)         (75)
Dividends on preferred stock                           (2)         (1)
Change in derivative financial instruments         (6)                            
Change in deferred retirement benefit costs (2)         (2)                          
Net income attributable to noncontrolling interest holders $ (3)               3                    
Dividends paid to noncontrolling interest holders                 (3)                    
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 200,000                                    
Shares issued for stock-based compensation 300,000                                    
Common stock shares outstanding at end of period at Jun. 30, 2025 270,400,000                                    
End of period at Jun. 30, 2025 $ 12,443 $ 3 7,541 4,784 (3) (11) $ (14)   129   $ 511 3,201 $ 80 4,348   $ 0 $ 3,056 $ 49 4,564
Shareholders' equity, end of year at Jun. 30, 2025               $ 12,314   8,140         7,669        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 1.42                                    
Beginning of period at Mar. 31, 2025     7,524 4,702 (1) (9)     129     3,201   4,198         4,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     10                                
Stock-based compensation activity     7                                
Capital contributions from parent                       0              
Net income $ 277                 151         138        
Net Income Available to Common Shareholder       275                     137        
Dividends on common stock       (193)                   0         0
Dividends on preferred stock                           (1)         (1)
Change in derivative financial instruments         (2)                            
Change in deferred retirement benefit costs (2)         (2)                          
Net income attributable to noncontrolling interest holders $ (2)               2                    
Dividends paid to noncontrolling interest holders                 (2)                    
Common stock shares outstanding at beginning of period at Mar. 31, 2025 270,300,000                                    
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 Jun. 30, 2025 270,400,000                                    
End of period at Jun. 30, 2025 $ 12,443 3 7,541 4,784 (3) (11) (14)   129   511 3,201 80 4,348   0 3,056 49 4,564
Shareholders' equity, end of year at Jun. 30, 2025               12,314   $ 8,140         $ 7,669        
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 Mar. 31, 2026 276,700,000                                    
End of period at Mar. 31, 2026     8,114 5,441 4 (6)     129     3,579   4,833         4,862
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     22                                
Stock-based compensation activity     4                                
Capital contributions from parent                   $ 425   425              
Net income 674                 $ 235         $ 404        
Net Income Available to Common Shareholder       671                     $ 403        
Dividends on common stock       (414)                   0         (265)
Dividends on preferred stock                           (2)         (1)
Change in derivative financial instruments         4                            
Change in deferred retirement benefit costs (1)         (1)                          
Net income attributable to noncontrolling interest holders $ (3)               3                    
Dividends paid to noncontrolling interest holders                 (3)                    
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 200,000                                    
Shares issued for stock-based compensation 200,000                                    
Common stock shares outstanding at end of period at Jun. 30, 2026 276,800,000                 102,100,000         25,500,000        
End of period at Jun. 30, 2026 $ 13,816 3 8,132 5,549 10 (7) 3   129   511 3,654 80 4,990   0 3,058 49 4,874
Shareholders' equity, end of year at Jun. 30, 2026 $ 13,687             13,687   $ 9,235         $ 7,981        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 1.50                                    
Beginning of period at Mar. 31, 2026     8,114 5,441 4 (6)     129     3,579   4,833         4,862
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                   75   75              
Net income $ 316                 $ 158         148        
Net Income Available to Common Shareholder       314                     $ 147        
Dividends on common stock       (206)                   0         (135)
Dividends on preferred stock                           (1)         (1)
Change in derivative financial instruments         6                            
Change in deferred retirement benefit costs (1)         (1)                          
Net income attributable to noncontrolling interest holders $ (2)               2                    
Dividends paid to noncontrolling interest holders                 (2)                    
Common stock shares outstanding at beginning of period at Mar. 31, 2026 276,700,000                                    
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 Jun. 30, 2026 276,800,000                 102,100,000         25,500,000        
End of period at Jun. 30, 2026 $ 13,816 $ 3 $ 8,132 $ 5,549 $ 10 $ (7) $ 3   $ 129   $ 511 $ 3,654 $ 80 $ 4,990   $ 0 $ 3,058 $ 49 $ 4,874
Shareholders' equity, end of year at Jun. 30, 2026 $ 13,687             $ 13,687   $ 9,235         $ 7,981        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.75