Insider Trading Arrangements	3 Months Ended	9 Months Ended
	Sep. 30, 2023 shares	Sep. 30, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Martin J. Lyons, Jr. [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On August 23, 2023, Martin J. Lyons, Jr., then President and Chief Executive Officer of Ameren, adopted a Rule 10b5-1 trading arrangement. Mr. Lyons' Rule 10b5-1 trading arrangement provides for the sale of 50% of any net shares of Ameren common stock received, after tax withholding, in connection with certain previously awarded restricted stock units and performance share units that will vest upon payment in March 2024 and March 2025. The estimated maximum number of shares to be sold pursuant to the Rule 10b5-1 trading arrangement is 40,775 shares. The actual number of shares sold pursuant to the Rule 10b5-1 trading arrangement will depend on the actual number of shares earned pursuant to the awards, which is generally dependent on the Company's achievement of certain performance measures, the actual dividends paid by the Company during the applicable vesting periods, and Mr. Lyons' continued employment and individual performance during the applicable vesting periods. Mr. Lyons' Rule 10b5-1 trading arrangement will terminate on the earlier of: (i) March 31, 2025; (ii) execution of all trades or expiration of all orders relating to such trades under the Rule 10b5-1 trading arrangement; or (iii) such date as the Rule 10b5-1 trading arrangement is otherwise terminated according to its terms.
Name	Martin J. Lyons, Jr.
Title	President and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 23, 2023
Arrangement Duration	586 days
Aggregate Available	40,775	40,775