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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 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, 2023     $ 7,216 $ 4,136 $ 0 $ (6)     $ 129     $ 2,725   $ 3,647         $ 3,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     30                                
Stock-based compensation activity     18                                
Capital contributions from parent                   $ 350   350              
Net income $ 979                 537         $ 454        
Net Income Available to Common Shareholder       975                     453        
Dividends on common stock       (535)                   0         (50)
Dividends on preferred stock                           (3)         (1)
Change in derivative financial instruments         0                            
Change in deferred retirement benefit costs (4)         (4)                          
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, 2023 266,300,000                                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 400,000                                    
Shares issued for stock-based compensation 200,000                                    
Common stock shares outstanding at end of period at Sep. 30, 2024 266,900,000                                    
End of period at Sep. 30, 2024 $ 11,962 $ 3 7,264 4,576 0 (10) $ (10)   129   $ 511 3,075 $ 80 4,181   $ 0 $ 3,020 $ 49 4,159
Shareholders' equity, end of year at Sep. 30, 2024               $ 11,833   7,847         7,228        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 2.01                                    
Beginning of period at Jun. 30, 2024     7,246 4,299 0 (9)     129     3,075   3,800         4,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     9                                
Stock-based compensation activity     9                                
Capital contributions from parent                       0              
Net income $ 457                 382         114        
Net Income Available to Common Shareholder       456                     114        
Dividends on common stock       (179)                   0         (25)
Dividends on preferred stock                           (1)         0
Change in derivative financial instruments         0                            
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, 2024 266,800,000                                    
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, 2024 266,900,000                                    
End of period at Sep. 30, 2024 $ 11,962 3 7,264 4,576 0 (10) (10)   129   511 3,075 80 4,181   0 3,020 49 4,159
Shareholders' equity, end of year at Sep. 30, 2024               11,833   $ 7,847         $ 7,228        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.67                                    
Beginning of period at Dec. 31, 2024 $ 12,243   7,513 4,604 3 (9)     129     3,201   4,206         4,266
Common stock shares outstanding at beginning of period at Dec. 31, 2024 269,900,000                 102,100,000         25,500,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
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     7,541 4,784 (3) (11)     129     3,201   4,348         4,564
Beginning of period at Dec. 31, 2024 $ 12,243   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                 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 300,000                                    
Common stock shares outstanding at end of period at Sep. 30, 2025 270,500,000                 102,100,000         25,500,000        
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             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                 102,100,000         25,500,000        
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             $ 12,780   $ 8,583         $ 7,707        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.71