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Short-Term Debt and Liquidity (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of March 31, 2021, and December 31, 2020. There were no borrowings outstanding under the Credit Agreements as of March 31, 2021, or December 31, 2020.
March 31, 2021December 31, 2020
Ameren (parent)$362 $490 
Ameren Missouri204 — 
Ameren Illinois323 — 
Ameren consolidated$889 $490 
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 three months ended March 31, 2021 and 2020:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
2021
Average daily amount outstanding$454 $99 $96 $649 
Weighted-average interest rate0.25 %0.22 %0.21 %0.24 %
Peak amount outstanding during period(a)
$650 $206 $353 $916 
Peak interest rate0.33 %0.25 %0.25 %0.33 %
2020
Average daily amount outstanding$157 $395 $76 $628 
Weighted-average interest rate1.94 %1.86 %1.99 %1.89 %
Peak amount outstanding during period(a)
$425 $573 $150 $908 
Peak interest rate3.30 %5.05 %
(b)
3.40 %5.05 %
(b)
(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.
(b)Ameren’s and Ameren Missouri’s peak interest rate was affected by temporary disruptions in the commercial paper market in the first quarter of 2020.