v3.25.2
Short-Term Debt and Liquidity (Tables)
 6 Months Ended
Jun. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of June 30, 2025, and December 31, 2024. There were no borrowings outstanding under the Credit Agreements as of June 30, 2025, or December 31, 2024.
June 30, 2025December 31, 2024
Ameren (parent)$566 $1,055 
Ameren Missouri330 — 
Ameren Illinois245 88 
Ameren consolidated$1,141 $1,143 
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 for the six months ended June 30, 2025 and 2024:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
2025
Average daily amount outstanding$659 $226 $90 $975 
Weighted-average interest rate4.63 %4.60 %4.59 %4.61 %
Peak amount outstanding during period(a)
$1,139 $650 $245 $1,603 
Peak interest rate4.75 %4.72 %4.70 %4.75 %
2024
Average daily amount outstanding$84 $109 $385 $578 
Weighted-average interest rate5.55 %5.53 %5.57 %5.56 %
Peak amount outstanding during period(a)
$301 $509 $694 $1,084 
Peak interest rate5.60 %5.68 %5.68 %5.68 %
(a)The timing of peak outstanding commercial paper issuances 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.