Short-Term Debt and Liquidity (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2020, and December 31, 2019. There were no borrowings outstanding under the Credit Agreements as of September 30, 2020, or December 31, 2019.

	September 30, 2020		December 31, 2019
Ameren (parent)	$	30	$	153
Ameren Missouri	—		234
Ameren Illinois	242		53
Ameren consolidated	$	272	$	440

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, 2020 and 2019:

	Ameren (parent)			Ameren Missouri				Ameren Illinois				Ameren Consolidated
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)
2019
Average daily amount outstanding	$	532		$	141			$	147			$	821
Weighted-average interest rate	2.70		%	2.73		%		2.58		%		2.68		%
Peak amount outstanding during period(a)	$	651		$	549			$	310			$	1,113
Peak interest rate	3.80		%	2.97		%		5.00		%	(c)	5.00		%	(c)

(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.

(c)Ameren’s and Ameren Illinois’ peak interest rate was affected by temporary disruptions in the commercial paper market in the third quarter of 2019.