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Short-Term Debt and Liquidity (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of March 31, 2023, and December 31, 2022. There were no borrowings outstanding under the Credit Agreements as of March 31, 2023, or December 31, 2022.
March 31, 2023December 31, 2022
Ameren (parent)$727 $477 
Ameren Missouri197 329 
Ameren Illinois324 264 
Ameren consolidated$1,248 $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 three months ended March 31, 2023 and 2022:
Ameren
(parent)		Ameren
Missouri		Ameren
Illinois		Ameren
Consolidated
2023
Average daily amount outstanding$506 $436 $233 $1,175 
Weighted-average interest rate4.89 %4.86 %4.89 %4.88 %
Peak amount outstanding during period(a)
$728 $592 $325 $1,381 
Peak interest rate5.55 %5.55 %5.60 %5.60 %
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 %
(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.