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Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2025 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
Theresa A. Shaw [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On August 13, 2025, Theresa A. Shaw, Senior Vice President, Finance and Chief Accounting Officer of Ameren, adopted a Rule 10b5-1 trading arrangement that provides for the sale of an aggregate of up to 1,300 shares to be sold in four equal quarterly installments between November 2025 and November 2026, subject to certain price limitations set forth in the trading arrangement. Ms. Shaw’s 10b5-1 trading arrangement will terminate on the earlier of: (i) November 13, 2026; (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	Theresa A. Shaw
Title	Senior Vice President, Finance and Chief Accounting Officer of Ameren
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 13, 2025
Expiration Date	November 13, 2026
Arrangement Duration	365 days
Aggregate Available	1,300