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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 year at Dec. 31, 2023     $ 7,216 $ 4,136 $ 0 $ (6)     $ 129     $ 2,725   $ 3,647     $ 3,020   $ 3,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     10                                
Stock-based compensation activity     2                                
Net income $ 262                 $ 26         $ 215        
Net income attributable to Ameren common shareholders 261     261           25         215        
Dividends on common stock       (178)                   0         0
Dividends on preferred stock                           (1)          
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 year at Dec. 31, 2023 266,300,000                                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan 100,000                                    
Shares issued for stock-based compensation 200,000                                    
Common stock shares outstanding at end of period at Mar. 31, 2024 266,600,000                                    
End of period at Mar. 31, 2024 $ 11,572 $ 3 7,228 4,219 0 (7) $ (7)   129   $ 511   $ 80 3,672   $ 0   $ 49 3,971
Shareholders' equity, end of year at Mar. 31, 2024               $ 11,443   6,988         7,040        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.67                                    
Beginning of year at Dec. 31, 2024 $ 12,243   7,513 4,604 3 (9)     129     $ 3,201   4,206     $ 3,056   4,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Shares issued under the DRPlus and 401(k) plan     15                                
Stock-based compensation activity     (4)                                
Net income 290                 43         236        
Net income attributable to Ameren common shareholders 289     289           $ 42         $ 236        
Dividends on common stock       (191)                   (50)         (75)
Dividends on preferred stock                           (1)          
Change in derivative financial instruments         (4)                            
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 year 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 100,000                                    
Shares issued for stock-based compensation 300,000                                    
Common stock shares outstanding at end of period at Mar. 31, 2025 270,300,000                 102,100,000         25,500,000        
End of period at Mar. 31, 2025 $ 12,348 $ 3 $ 7,524 $ 4,702 $ (1) $ (9) $ (10)   $ 129   $ 511   $ 80 $ 4,198   $ 0   $ 49 $ 4,427
Shareholders' equity, end of year at Mar. 31, 2025 $ 12,219             $ 12,219   $ 7,990         $ 7,532        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Dividends per common share $ 0.71