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Short-Term Debt and Liquidity (Tables)
3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of March 31, 2022, and December 31, 2021. There were no borrowings outstanding under the Credit Agreements as of March 31, 2022, or December 31, 2021.
March 31, 2022December 31, 2021
Ameren (parent)$466 $277 
Ameren Missouri528 165 
Ameren Illinois107 103 
Ameren consolidated$1,101 $545 
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, 2022 and 2021:
Ameren
(parent)
Ameren
Missouri
Ameren
Illinois
Ameren
Consolidated
2022
Average daily amount outstanding$282 $408 $99 $789 
Weighted-average interest rate0.41 %0.44 %0.33 %0.41 %
Peak amount outstanding during period(a)
$466 $539 $142 $1,101 
Peak interest rate1.05 %1.06 %1.15 %1.15 %
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 %
(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.