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

3 Months Ended

Mar. 31, 2017

Schedule of Commercial paper [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding as of March 31, 2017, and December 31, 2016:

	2017		2016
Ameren (parent)	$	810	$	507
Ameren Missouri	36		—
Ameren Illinois	68		51
Ameren Consolidated	$	914	$	558

The following table summarizes the borrowing activity and relevant interest rates under Ameren’s (parent), Ameren Missouri’s, and Ameren Illinois’ commercial paper programs for the three months ended March 31, 2017 and 2016:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2017
Average daily commercial paper outstanding	$	682		$	4		$	50		$	736
Weighted-average interest rate	1.07		%	0.93		%	0.95		%	1.06		%
Peak commercial paper during period(a)	$	810		$	45		$	74		$	914
Peak interest rate	1.30		%	1.15		%	1.15		%	1.30		%
2016
Average daily commercial paper outstanding	$	349		$	68		$	—		$	417
Weighted-average interest rate	0.82		%	0.80		%	—		%	0.81		%
Peak commercial paper during period(a)	$	482		$	208		$	—		$	581
Peak interest rate	0.95		%	0.85		%	—		%	0.95		%

(a) The timing of peak commercial paper issuances varies by company. Therefore, the sum of peak commercial paper issuances presented by company does not equal the Ameren Consolidated peak commercial paper issuances for the period.