Short-Term Debt and Liquidity (Tables)

6 Months Ended

Jun. 30, 2022

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding, net of issuance discounts, as of June 30, 2022, and December 31, 2021. There were no borrowings outstanding under the Credit Agreements as of June 30, 2022, or December 31, 2021.

	June 30, 2022		December 31, 2021
Ameren (parent)	$	595	$	277
Ameren Missouri	285		165
Ameren Illinois	141		103
Ameren consolidated	$	1,021	$	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 six months ended June 30, 2022 and 2021:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2022
Average daily amount outstanding	$	374		$	271		$	57		$	702
Weighted-average interest rate	0.87		%	0.65		%	0.47		%	0.75		%
Peak amount outstanding during period(a)	$	595		$	539		$	142		$	1,101
Peak interest rate	2.05		%	2.05		%	2.05		%	2.05		%
2021
Average daily amount outstanding	$	388		$	183		$	211		$	782
Weighted-average interest rate	0.24		%	0.22		%	0.22		%	0.23		%
Peak amount outstanding during period(a)	$	650		$	546		$	485		$	1,134
Peak interest rate	0.33		%	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.