Short-Term Debt And Liquidity Short-Term Debt and Liquidity (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding, net of issuance discounts, as of March 31, 2019, and December 31, 2018:

	March 31, 2019		December 31, 2018
Ameren (parent)	$	618	$	470
Ameren Missouri	55		55
Ameren Illinois	126		72
Ameren consolidated	$	799	$	597

The following table summarizes the borrowing activity and relevant interest rates under Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper programs for the three months ended March 31, 2019 and 2018:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2019
Average daily commercial paper outstanding at par value	$	480		$	246		$	89		$	815
Weighted-average interest rate	2.87		%	2.84		%	2.76		%	2.85		%
Peak commercial paper during period at par value(a)	$	618		$	549		$	130		$	1,113
Peak interest rate	3.10		%	2.97		%	2.90		%	3.10		%
2018
Average daily commercial paper outstanding at par value	$	378		$	213		$	137		$	728
Weighted-average interest rate	1.90		%	1.88		%	1.96		%	1.90		%
Peak commercial paper during period at par value(a)	$	454		$	282		$	238		$	960
Peak interest rate	2.35		%	2.40		%	2.55		%	2.55		%

(a) The timing of peak outstanding commercial paper issuances varies by company. Therefore, the sum of individual company peak amounts may not equal the Ameren consolidated peak commercial paper issuances for the period.