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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Pay vs Performance Disclosure [Table]        
Pay vs Performance [Table Text Block]
Pay vs. Performance
To comply with Item 402(v) of Regulation S-K, we are providing the following information.
The Pay vs. Performance (“PVP”) table below provides the “compensation actually paid” ​(“CAP”) to the Company’s CEO and the average CAP for non-CEO NEOs. CAP represents a new calculation of compensation that differs from the total compensation reported in the Summary Compensation Table (“SCT”). You should refer to the “Compensation Discussion and Analysis” section above for discussion regarding how the Company’s compensation program is designed to align with the Company’s performance and long-term shareholder interests.
Year
(a)
​ ​ ​ ​ ​
Value of initial fixed $100
investment based on:
​ ​ ​ ​
​
Summary
Compensation
Table Total for
CEO(1)
($)
(b)
 ​ ​
Compensation
Actually
Paid to
CEO(3)
($)
(c)
 ​ ​
Average
Summary
Compensation
Table Total for
Non-CEO
NEOs(2)
($)
(d)
 ​ ​
Average
Compensation
Actually
Paid to
Non-CEO
NEOs(4)
($)
(e)
 ​ ​
Cumulative
Total
Shareholder
Return
($)
(f)
 ​ ​
Peer Group
Cumulative
Total
Shareholder
Return(5)
($)
(g)
 ​ ​
Net Income(6)
(in millions)
$
(h)
 ​ ​
Company-
Selected
Measure:
Annual
Earnings
Per Share(7)
($)
(i)
 ​
2022 ​ ​ ​ ​ 7,357,331 ​ ​ ​ ​ ​ 8,431,586 ​ ​ ​ ​ ​ 3,855,710 ​ ​ ​ ​ ​ 4,629,404 ​ ​ ​ ​ ​ 125.2 ​ ​ ​ ​ ​ 120.1 ​ ​ ​ ​ ​ 1,074 ​ ​ ​ ​ ​ 4.14 ​ ​
2021 ​ ​ ​ ​ 9,807,836 ​ ​ ​ ​ ​ 13,567,261 ​ ​ ​ ​ ​ 3,278,949 ​ ​ ​ ​ ​ 4,395,710 ​ ​ ​ ​ ​ 122.1 ​ ​ ​ ​ ​ 118.3 ​ ​ ​ ​ ​ 990 ​ ​ ​ ​ ​ 3.84 ​ ​
2020 ​ ​ ​ ​ 10,058,353 ​ ​ ​ ​ ​ 15,068,893 ​ ​ ​ ​ ​ 4,119,985 ​ ​ ​ ​ ​ 5,163,486 ​ ​ ​ ​ ​ 104.3 ​ ​ ​ ​ ​ 100.5 ​ ​ ​ ​ ​ 871 ​ ​ ​ ​ ​ 3.50 ​ ​
​
(1)
Mr. Lyons served as the Company’s President and Chief Executive Officer during 2022. Mr. Baxter served as the Company’s Chairman, President and Chief Executive Officer in 2020 and 2021.
​
(2)
The NEOs for the applicable periods are: Mr. Lyons (2020-2021), Mr. Moehn (2020-2022), Mr. Baxter (2022), Ms. Nwamu (2022), Mr. Birk (2022), Mr. Mark (2020-2021), and Mr. Diya (2020-2021).
​
(3)
To calculate CAP for the CEO, as reported in column (c), the following amounts were deducted from and added to the CEO’s total compensation, as reported in the SCT :
​
​ ​ ​
2022
 ​ ​
2021
 ​ ​
2020
 ​
SCT Total for CEO ​ ​ ​ ​ 7,357,331 ​ ​ ​ ​ ​ 9,807,836 ​ ​ ​ ​ ​ 10,058,353 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​ ​ ​ ​ (4,271,210) ​ ​ ​ ​ ​ (5,572,210) ​ ​ ​ ​ ​ (5,546,556) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ — ​ ​ ​ ​ ​ (514,419) ​ ​ ​ ​ ​ (1,330,006) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(8) ​ ​ ​ ​ 4,564,904 ​ ​ ​ ​ ​ 6,503,849 ​ ​ ​ ​ ​ 7,053,682 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the year(8) ​ ​ ​ ​ (86,593) ​ ​ ​ ​ ​ (930,958) ​ ​ ​ ​ ​ 267,784 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested
and Outstanding at Year-End(8) 		​ ​ ​ ​ 638,260 ​ ​ ​ ​ ​ 4,023,820 ​ ​ ​ ​ ​ 4,366,953 ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 228,894 ​ ​ ​ ​ ​ 249,343 ​ ​ ​ ​ ​ 198,683 ​ ​
Compensation Actually Paid to CEO(9) ​ ​ ​ ​ 8,431,586 ​ ​ ​ ​ ​ 13,567,261 ​ ​ ​ ​ ​ 15,068,893 ​ ​
(4)
To calculate Average CAP for the other NEOs, as reported in column (e), the following amounts were deducted from and added to the NEOs’ total compensation, as reported in the SCT:
​
​ ​ ​
2022
 ​ ​
2021
 ​ ​
2020
 ​
Average SCT Total Compensation for Non-CEO NEOs ​ ​ ​ ​ 3,855,710 ​ ​ ​ ​ ​ 3,278,949 ​ ​ ​ ​ ​ 4,119,985 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​ ​ ​ ​ (2,060,415) ​ ​ ​ ​ ​ (1,691,969) ​ ​ ​ ​ ​ (2,353,962) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ — ​ ​ ​ ​ ​ (207,943) ​ ​ ​ ​ ​ (552,469) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Fair Value of Unvested Awards Granted in Year(8) ​ ​ ​ ​ 2,187,358 ​ ​ ​ ​ ​ 1,974,854 ​ ​ ​ ​ ​ 2,806,801 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the year(8) ​ ​ ​ ​ (107,389) ​ ​ ​ ​ ​ (273,115) ​ ​ ​ ​ ​ 65,188 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that remain Unvested and Outstanding at Year-End(8) ​ ​ ​ ​ 583,120 ​ ​ ​ ​ ​ 1,183,960 ​ ​ ​ ​ ​ 971,028 ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 171,020 ​ ​ ​ ​ ​ 130,974 ​ ​ ​ ​ ​ 106,915 ​ ​
Average Compensation Actually Paid to Non-CEO NEOs(9) ​ ​ ​ ​ 4,629,404 ​ ​ ​ ​ ​ 4,395,710 ​ ​ ​ ​ ​ 5,163,486 ​ ​
​
(5)
Represents the Cumulative TSR for the S&P 500 Utilities Index.
​
(6)
Value reported is net income attributable to Ameren common shareholders.
​
(7)
Value reported is the Company’s GAAP diluted EPS for the respective year, as reported in the Company’s Annual Report on Form 10-K for the applicable period.
​
(8)
The below table provides the valuation assumptions used in determining the fair value of equity awards (on the respective valuation dates) that are materially different from those originally disclosed as of the grant date of such equity awards.
​
Performance Period
​ ​
2022 – 2024
​ ​
2021 – 2023
​ ​
2020 – 2022
​ ​
2019 – 2021
​ ​
2018 – 2020
​
Valuation Date ​ ​
12/31/2022
​ ​
12/31/2021
​ ​
12/31/2022
​ ​
12/31/2020
​ ​
12/31/2021
​ ​
12/31/2019
​ ​
12/31/2020
​ ​
12/31/2019
​
Risk-free rate ​ ​
4.41%
​ ​
0.73%
​ ​
4.73%
​ ​
0.13%
​ ​
0.39%
​ ​
1.58%
​ ​
0.10%
​ ​
1.59%
​
Ameren’s common stock volatility ​ ​
20.09%
​ ​
33.2%
​ ​
21.99%
​ ​
32.2%
​ ​
18.0%
​ ​
16.5%
​ ​
43.3%
​ ​
14.3%
​
Volatility Range for Peer Group ​ ​
19.18% – 
23.89%
​ ​
29.71% – 
41.14%
​ ​
21.77% – 
27.08%
​ ​
28.98% – 
40.10%
​ ​
16.19% – 
22.46%
​ ​
15.06% – 
30.22%
​ ​
38.61% – 
54.73%
​ ​
12.67% – 
146.95%
​
​
(9)
No adjustments were required with respect to the dollar value of dividends or other earnings paid on stock or option awards, because the value of dividend equivalents accrued on such awards are included in the calculation of the fair value of such awards as of each applicable valuation date.
     
Company Selected Measure Name Annual Earnings Per Share      
Named Executive Officers, Footnote [Text Block] 2)
The NEOs for the applicable periods are: Mr. Lyons (2020-2021), Mr. Moehn (2020-2022), Mr. Baxter (2022), Ms. Nwamu (2022), Mr. Birk (2022), Mr. Mark (2020-2021), and Mr. Diya (2020-2021) 		     
Peer Group Issuers, Footnote [Text Block] 5)
Represents the Cumulative TSR for the S&P 500 Utilities Index 		     
PEO Total Compensation Amount $ 7,357,331 $ 9,807,836 $ 10,058,353  
PEO Actually Paid Compensation Amount $ 8,431,586 13,567,261 15,068,893  
Adjustment To PEO Compensation, Footnote [Text Block]
(3)
To calculate CAP for the CEO, as reported in column (c), the following amounts were deducted from and added to the CEO’s total compensation, as reported in the SCT :
​
​ ​ ​
2022
 ​ ​
2021
 ​ ​
2020
 ​
SCT Total for CEO ​ ​ ​ ​ 7,357,331 ​ ​ ​ ​ ​ 9,807,836 ​ ​ ​ ​ ​ 10,058,353 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​ ​ ​ ​ (4,271,210) ​ ​ ​ ​ ​ (5,572,210) ​ ​ ​ ​ ​ (5,546,556) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ — ​ ​ ​ ​ ​ (514,419) ​ ​ ​ ​ ​ (1,330,006) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(8) ​ ​ ​ ​ 4,564,904 ​ ​ ​ ​ ​ 6,503,849 ​ ​ ​ ​ ​ 7,053,682 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the year(8) ​ ​ ​ ​ (86,593) ​ ​ ​ ​ ​ (930,958) ​ ​ ​ ​ ​ 267,784 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested
and Outstanding at Year-End(8) 		​ ​ ​ ​ 638,260 ​ ​ ​ ​ ​ 4,023,820 ​ ​ ​ ​ ​ 4,366,953 ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 228,894 ​ ​ ​ ​ ​ 249,343 ​ ​ ​ ​ ​ 198,683 ​ ​
Compensation Actually Paid to CEO(9) ​ ​ ​ ​ 8,431,586 ​ ​ ​ ​ ​ 13,567,261 ​ ​ ​ ​ ​ 15,068,893 ​ ​
     
Non-PEO NEO Average Total Compensation Amount $ 3,855,710 3,278,949 4,119,985  
Non-PEO NEO Average Compensation Actually Paid Amount $ 4,629,404 4,395,710 5,163,486  
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
(4)
To calculate Average CAP for the other NEOs, as reported in column (e), the following amounts were deducted from and added to the NEOs’ total compensation, as reported in the SCT:
​
​​​
2022
​​
2021
​​
2020
​ Average SCT Total Compensation for Non-CEO NEOs ​​​​3,855,710 ​​​​​3,278,949​​​​​4,119,985​​ Deductions from SCT: ​​​​​​​​​​​​​​​​​​​ Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​​​​(2,060,415)​​​​​(1,691,969)​​​​​(2,353,962)​​ Change in Pension Value (as included in column (g) of the SCT) ​​​​—​​​​​(207,943)​​​​​(552,469)​​ Additions to SCT: ​​​​​​​​​​​​​​​​​​​ Fair Value of Unvested Awards Granted in Year(8) ​​​​2,187,358 ​​​​​1,974,854​​​​​2,806,801​​ Change in Fair Value of Awards Granted in Prior Years that Vested during the year(8) ​​​​(107,389) ​​​​​(273,115) ​​​​​65,188 ​​ Change in Fair Value of Unvested Awards Granted in Prior Years that remain Unvested and Outstanding at Year-End(8) ​​​​583,120 ​​​​​1,183,960 ​​​​​971,028​​ Service Cost for all Defined Benefit Pension Plans ​​​​171,020​​​​​130,974​​​​​106,915​​ Average Compensation Actually Paid to Non-CEO NEOs(9) ​​​​4,629,404 ​​​​​4,395,710 ​​​​​5,163 		     
Compensation Actually Paid vs. Company Selected Measure [Text Block]
Relationship Between Compensation Actually Paid and Performance Measures in the PVP Table
The most important annual financial measure that the Company uses to link pay to performance is the Company’s annual EPS, which is not only the most heavily weighted metric in the STIP, but also correlates to the Company’s TSR, which is the most heavily weighted performance metric in the Company’s LTIP. As shown in the chart below, the Company’s EPS increased by 9.7% between 2020 and 2021, while the CEO and Average NEO CAP decreased by 10% and 14.9%, respectively, for the same period. In 2022, while the Average NEO CAP increased by 5.3% and the CEO CAP decreased by 37.9%, driven primarily by the appointment of a new CEO effective January 1, 2022, the Company’s EPS increased by 7.8%.
During the same three-year period (2020 – 2022), the Company’s Cumulative TSR was 25.2% and the Company’s net income increased by 23.3%. In addition, Ameren has consistently outperformed the S&P 500 Utilities Index for the reported periods. The value of an initial fixed $100 investment based on the Company’s cumulative TSR was 3.8, 3.8 and 5.1 percentage points above the S&P 500 Utilities Index TSR in 2020, 2021, and 2022, respectively.
[MISSING IMAGE: bc_capvscsmeps-pn.jpg]
     
Tabular List [Table Text Block]
Additional Company-Selected Performance Measures
The following table represents the unranked list of the most important performance measures the Company used to align compensation actually paid to the CEO and NEOs for 2022 to Company performance. While these performance measures are the most important measures, additional financial and other measures were also considered to align the CEO and NEOs’ pay and performance as further described in the “Compensation Discussion and Analysis” section above.
​ Annual EPS ​
​ Three-Year TSR Ranking vs. the TSR Peer Group ​
​ Clean Energy Transition metric ​
These measures generally reflect those used internally to measure Company performance and externally to report to investors, and taken together they provide a holistic measure of Company growth, shareholder value and overall financial performance, as well as progress toward transitioning to clean energy through the addition of renewable generation, energy storage and the retirement of coal-fired energy centers.
     
Total Shareholder Return Amount $ 125.2 122.1 104.3  
Peer Group Total Shareholder Return Amount 120.1 118.3 100.5  
Net Income (Loss) $ 1,074,000,000 $ 990,000,000 $ 871,000,000  
Company Selected Measure Amount 4.14 3.84 3.5  
PEO Name Mr. Lyons      
Measure [Axis]: 1        
Pay vs Performance Disclosure [Table]        
Measure Name Annual EPS      
Non-GAAP Measure Description [Text Block]
(7)
Value reported is the Company’s GAAP diluted EPS for the respective year, as reported in the Company’s Annual Report on Form 10-K for the applicable period.
     
Measure [Axis]: 2        
Pay vs Performance Disclosure [Table]        
Measure Name Three-Year TSR Ranking vs. the TSR Peer Group      
Measure [Axis]: 3        
Pay vs Performance Disclosure [Table]        
Measure Name Clean Energy Transition metric      
Adjustment To Compensation, Fair Value of Equity Awards, Valuation Assumptions Used For Performance Period 2022-2024 [Member]        
Pay vs Performance Disclosure [Table]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 4.41%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate 20.09%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peer Group, Minimum 19.18%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peet, Maximum 23.89%      
Adjustment To Compensation, Fair Value of Equity Awards, Valuation Assumptions Used For Performance Period 2021-2023 [Member]        
Pay vs Performance Disclosure [Table]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 4.73% 0.73%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate 21.99% 33.20%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peer Group, Minimum 21.77% 29.71%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peet, Maximum 27.08% 41.14%    
Adjustment To Compensation, Fair Value of Equity Awards, Valuation Assumptions Used For Performance Period 2020-2022 [Member]        
Pay vs Performance Disclosure [Table]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   0.39% 0.13%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate   18.00% 32.20%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peer Group, Minimum   16.19% 28.98%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peet, Maximum   22.46% 40.10%  
Adjustment To Compensation, Fair Value of Equity Awards, Valuation Assumptions Used For Performance Period 2019-2021 [Member]        
Pay vs Performance Disclosure [Table]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.10% 1.58%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     43.30% 16.50%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peer Group, Minimum     38.61% 15.06%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peet, Maximum     54.73% 30.22%
Adjustment To Compensation, Fair Value of Equity Awards, Valuation Assumptions Used For Performance Period 2018-2020 [Member]        
Pay vs Performance Disclosure [Table]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       1.59%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate       14.30%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peer Group, Minimum       12.67%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Range For Peet, Maximum       146.95%
Mr. Lyons [Member] | Grant Date Fair Value of Equity-Based Awards Granted in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ (4,271,210) $ (5,572,210) $ (5,546,556)  
Mr. Lyons [Member] | Change In Pension Value [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount   (514,419) (1,330,006)  
Mr. Lyons [Member] | Fair Value at Year-end of Unvested Awards Granted in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 4,564,904 6,503,849 7,053,682  
Mr. Lyons [Member] | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (86,593) (930,958) 267,784  
Mr. Lyons [Member] | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 638,260 4,023,820 4,366,953  
Mr. Lyons [Member] | Service Cost for all Defined Benefit Pension Plans [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 228,894 249,343 198,683  
Non-PEO NEO [Member] | Grant Date Fair Value of Equity-Based Awards Granted in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (2,060,415) (1,691,969) (2,353,962)  
Non-PEO NEO [Member] | Change In Pension Value [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount   (207,943) (552,469)  
Non-PEO NEO [Member] | Fair Value at Year-end of Unvested Awards Granted in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 2,187,358 1,974,854 2,806,801  
Non-PEO NEO [Member] | Change In Fair Value As Of Vesting Date Of Prior Year Awards Vested During Current Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (107,389) (273,115) 65,188  
Non-PEO NEO [Member] | Change In Fair Value Of Outstanding And Unvested Awards Granted In Prior Fiscal Years [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 583,120 1,183,960 971,028  
Non-PEO NEO [Member] | Service Cost for all Defined Benefit Pension Plans [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ 171,020 $ 130,974 $ 106,915