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Short-Term Debt and Liquidity (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of June 30, 2024, and December 31, 2023. There were no borrowings outstanding under the Credit Agreements as of June 30, 2024, or December 31, 2023.
June 30, 2024December 31, 2023
Ameren (parent)$301 $— 
Ameren Missouri390 170 
Ameren Illinois— 366 
Ameren consolidated$691 $536 
The following table summarizes the activity and relevant interest rates for Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper issuances and borrowings under the Credit Agreements in the aggregate for the six months ended June 30, 2024 and 2023:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
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 %
2023
Average daily amount outstanding$595 $343 $230 $1,168 
Weighted-average interest rate5.14 %5.04 %5.10 %5.10 %
Peak amount outstanding during period(a)
$841 $592 $450 $1,381 
Peak interest rate5.55 %5.55 %5.60 %5.60 %
(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.