Short-Term Debt and Liquidity (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Short-term Debt

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

	June 30, 2020		December 31, 2019
Ameren (parent)	$	—	$	153
Ameren Missouri	79		234
Ameren Illinois	41		53
Ameren consolidated	$	120	$	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 six months ended June 30, 2020 and 2019:

	Ameren (parent)			Ameren Missouri				Ameren Illinois			Ameren Consolidated
2020
Average daily amount outstanding	$	93		$	202			$	40		$	335
Weighted-average interest rate	2.05		%	1.86		%		1.98		%	1.92		%
Peak amount outstanding during period(a)	$	425		$	573			$	150		$	908
Peak interest rate	3.30		%	5.05		%	(b)	3.40		%	5.05		%	(b)
2019
Average daily amount outstanding	$	542		$	174			$	106		$	822
Weighted-average interest rate	2.80		%	2.79		%		2.72		%	2.79		%
Peak amount outstanding during period(a)	$	636		$	549			$	202		$	1,113
Peak interest rate	3.10		%	2.97		%		2.90		%	3.10		%

(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 Missouri’s peak interest rate was affected by temporary disruptions in the commercial paper market in the first quarter of 2020.