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Short-Term Debt And Liquidity (Tables)

12 Months Ended

Dec. 31, 2025

Line of Credit Facility [Abstract]

Schedule Of Maximum Aggregate Amount Available On Credit Agreements

The following table presents the maximum aggregate amount available to each borrower under each facility:

						Missouri Credit Agreement			Illinois Credit Agreement
Ameren (parent)						$	1,600		$	800
Ameren Missouri						1,600			(a)
Ameren Illinois						(a)			1,100

(a)Not applicable.

Schedule of Commercial Paper

The following table summarizes the activity and relevant interest rates for Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper issuances under the Credit Agreements in the aggregate for the years ended December 31, 2025 and 2024:

						Ameren (parent)						Ameren Missouri						Ameren Illinois						Ameren Consolidated
2025
Average daily amount outstanding						$	620					$	223					$	97					$	940
Commercial paper issuances outstanding at period-end						155						471						17						643
Weighted-average interest rate						4.48		%				4.48		%				4.55		%				4.49		%
Peak amount outstanding during period(a)						$	1,139					$	650					$	425					$	1,603
Peak interest rate						4.75		%				4.72		%				4.70		%				4.75		%
2024
Average daily amount outstanding						$	377					$	192					$	193					$	762
Commercial paper issuances outstanding at period-end						1,055						—						88						1,143
Weighted-average interest rate						5.10		%				5.34		%				5.57		%				5.28		%
Peak amount outstanding during period(a)						$	1,091					$	595					$	694					$	1,569
Peak interest rate						5.60		%				5.68		%				5.68		%				5.68		%

(a)    The timing of peak outstanding commercial paper issuances and borrowings under the Credit Agreements varies by company. Therefore, the sum of individual company peak amounts may not equal the Ameren consolidated peak amount for the period.

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- Definition

Schedule Of Maximum Aggregate Amount Available On Credit Agreements [Table Text Block]

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- Definition

Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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