v3.26.3
Short-Term Debt and Liquidity (Tables)
 9 Months Ended
Sep. 30, 2026
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2026, and December 31, 2025. There were no borrowings outstanding under the Credit Agreements as of September 30, 2026, or December 31, 2025.
September 30, 2026December 31, 2025
Ameren (parent)$208 $155 
Ameren Missouri100 471 
Ameren Illinois188 17 
Ameren consolidated$496 $643 
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 nine months ended September 30, 2026 and 2025:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
2026
Average daily amount outstanding$662 $314 $166 $1,142 
Weighted-average interest rate3.90 %3.87 %3.89 %3.89 %
Peak amount outstanding during period(a)
$1,073 $1,360 $503 $1,996 
Peak interest rate4.08 %4.08 %4.08 %4.08 %
2025
Average daily amount outstanding$637 $245 $130 $1,012 
Weighted-average interest rate4.60 %4.58 %4.55 %4.59 %
Peak amount outstanding during period(a)
$1,139 $650 $425 $1,603 
Peak interest rate4.75 %4.72 %4.70 %4.75 %
(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.