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Short-Term Debt and Liquidity (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2023, and December 31, 2022. There were no borrowings outstanding under the Credit Agreements as of September 30, 2023, or December 31, 2022.
September 30, 2023December 31, 2022
Ameren (parent)$1,124 $477 
Ameren Missouri157 329 
Ameren Illinois59 264 
Ameren consolidated$1,340 $1,070 
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 nine months ended September 30, 2023 and 2022:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
2023
Average daily amount outstanding$687 $306 $181 $1,174 
Weighted-average interest rate5.29 %5.15 %5.15 %5.24 %
Peak amount outstanding during period(a)
$1,127 $592 $450 $1,381 
Peak interest rate5.60 %5.60 %5.60 %5.60 %
2022
Average daily amount outstanding$439 $253 $99 $791 
Weighted-average interest rate1.58 %1.16 %1.77 %1.47 %
Peak amount outstanding during period(a)
$690 $539 $354 $1,222 
Peak interest rate3.55 %3.55 %3.60 %3.60 %
(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 for the period.