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Consolidated Statement of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Other Paid-in Capital
Retained Earnings
Deferred Retirement Benefit Costs
Accumulated Other Comprehensive Income
Total Ameren Corporation 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, 2020     $ 6,179 $ 2,757 $ (1)     $ 142     $ 2,518   $ 2,101     $ 2,652 $ 62 $ 2,252
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Settlement of forward sale agreement through common shares issuance     113                              
Shares issued under the ATM program     148                              
Shares issued under the DRPlus and 401(k) plan     36                              
Stock-based compensation activity     7                              
Capital contributions from parent                 $ 183   183     $ 145   145    
Net income $ 869               536       536 315       315
Net income attributable to Ameren common shareholders 865     865                            
Dividends on common stock       (423)                            
Preferred stock dividends                         (3)         (1)
Change in deferred retirement benefit costs 1       1                          
Net income attributable to noncontrolling interest holders $ (4)             4                    
Dividends paid to noncontrolling interest holders               (4)                    
Redemptions of preferred stock               (13)                 (13)  
Common stock shares outstanding at beginning of year (in shares) at Dec. 31, 2020 253,300,000                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Shares issued under forward sale agreement (in shares) 1,600,000                                  
Stock Issued During Period, Shares, New Issues 1,800,000                                  
Shares issued under the DRPlus and 401(k) plan 400,000                                  
Shares issued for stock-based compensation (in shares) 500,000                                  
Common stock shares outstanding at end of period (in shares) at Sep. 30, 2021 257,600,000                                  
End of period at Sep. 30, 2021 $ 9,814 $ 3 6,483 3,199 0 $ 0   129   $ 511 2,701 $ 80 2,634   $ 0 2,797 49 2,566
Shareholders' equity, end of year at Sep. 30, 2021             $ 9,685   5,926         5,412        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Dividends per common share (in dollars per share) $ 1.65                                  
Beginning of period at Jun. 30, 2021     6,436 2,915 (1)     129     2,701   2,259     2,722 49 2,487
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Settlement of forward sale agreement through common shares issuance     0                              
Shares issued under the ATM program     27                              
Shares issued under the DRPlus and 401(k) plan     12                              
Stock-based compensation activity     8                              
Capital contributions from parent                     0         75    
Net income $ 426               376       376 79       79
Net income attributable to Ameren common shareholders 425     425                            
Dividends on common stock       (141)                            
Preferred stock dividends                         (1)         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)                    
Redemptions of preferred stock               0                 0  
Common stock shares outstanding at beginning of year (in shares) at Jun. 30, 2021 257,100,000                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Shares issued under forward sale agreement (in shares) 0                                  
Stock Issued During Period, Shares, New Issues 400,000                                  
Shares issued under the DRPlus and 401(k) plan 100,000                                  
Shares issued for stock-based compensation (in shares) 0                                  
Common stock shares outstanding at end of period (in shares) at Sep. 30, 2021 257,600,000                                  
End of period at Sep. 30, 2021 $ 9,814 3 6,483 3,199 0 0   129   511 2,701 80 2,634   0 2,797 49 2,566
Shareholders' equity, end of year at Sep. 30, 2021             9,685   5,926         5,412        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Dividends per common share (in dollars per share) $ 0.55                                  
Beginning of period at Dec. 31, 2021 $ 9,829   6,502 3,182 13     129     2,725   2,595     2,914 49 2,677
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Settlement of forward sale agreement through common shares issuance     0                              
Shares issued under the ATM program     0                              
Shares issued under the DRPlus and 401(k) plan     37                              
Stock-based compensation activity     9                              
Capital contributions from parent                 0   0     0   0    
Net income 915               $ 550       550 $ 376       376
Net income attributable to Ameren common shareholders 911     911                            
Dividends on common stock       (457)                            
Preferred stock dividends                         (3)         (1)
Change in deferred retirement benefit costs 1       1                          
Net income attributable to noncontrolling interest holders $ (4)             4                    
Dividends paid to noncontrolling interest holders               (4)                    
Redemptions of preferred stock               0                 0  
Common stock shares outstanding at beginning of year (in shares) at Dec. 31, 2021 257,700,000               102,100,000         25,500,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Shares issued under forward sale agreement (in shares) 0                                  
Stock Issued During Period, Shares, New Issues 0                                  
Shares issued under the DRPlus and 401(k) plan 400,000                                  
Shares issued for stock-based compensation (in shares) 400,000                                  
Common stock shares outstanding at end of period (in shares) at Sep. 30, 2022 258,500,000               102,100,000         25,500,000        
End of period at Sep. 30, 2022 $ 10,330 3 6,548 3,636 14 14   129   511 2,725 80 3,142   0 2,914 49 3,052
Shareholders' equity, end of year at Sep. 30, 2022 $ 10,201           10,201   $ 6,458         $ 6,015        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Dividends per common share (in dollars per share) $ 1.77                                  
Beginning of period at Jun. 30, 2022     6,527 3,336 14     129     2,725   2,745     2,914 49 2,949
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Settlement of forward sale agreement through common shares issuance     0                              
Shares issued under the ATM program     0                              
Shares issued under the DRPlus and 401(k) plan     12                              
Stock-based compensation activity     9                              
Capital contributions from parent                     0         0    
Net income $ 453               $ 398       398 $ 103       103
Net income attributable to Ameren common shareholders 452     452                            
Dividends on common stock       (152)                            
Preferred stock dividends                         (1)         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)                    
Redemptions of preferred stock               0                 0  
Common stock shares outstanding at beginning of year (in shares) at Jun. 30, 2022 258,400,000                                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Shares issued under forward sale agreement (in shares) 0                                  
Stock Issued During Period, Shares, New Issues 0                                  
Shares issued under the DRPlus and 401(k) plan 100,000                                  
Shares issued for stock-based compensation (in shares) 0                                  
Common stock shares outstanding at end of period (in shares) at Sep. 30, 2022 258,500,000               102,100,000         25,500,000        
End of period at Sep. 30, 2022 $ 10,330 $ 3 $ 6,548 $ 3,636 $ 14 $ 14   $ 129   $ 511 $ 2,725 $ 80 $ 3,142   $ 0 $ 2,914 $ 49 $ 3,052
Shareholders' equity, end of year at Sep. 30, 2022 $ 10,201           $ 10,201   $ 6,458         $ 6,015        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Dividends per common share (in dollars per share) $ 0.59