Short-Term Debt and Liquidity (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Short-term Debt

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, 2021 and 2020:

	Ameren (parent)			Ameren Missouri				Ameren Illinois			Ameren Consolidated
2021
Average daily amount outstanding	$	404		$	121			$	140		$	665
Weighted-average interest rate	0.23		%	0.22		%		0.22		%	0.22		%
Peak amount outstanding during period(a)	$	650		$	546			$	485		$	1,134
Peak interest rate	0.33		%	0.25		%		0.25		%	0.33		%
2020
Average daily amount outstanding	$	62		$	142			$	53		$	257
Weighted-average interest rate	2.04		%	1.76		%		1.10		%	1.70		%
Peak amount outstanding during period(a)	$	425		$	573			$	243		$	908
Peak interest rate	3.30		%	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.