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Short-Term Debt And Liquidity (Tables) | 12 Months Ended
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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 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 + Details
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