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

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding as of September 30, 2017, and December 31, 2016:

	2017		2016
Ameren (parent)	$	277	$	507
Ameren Missouri	—		—
Ameren Illinois	169		51
Ameren Consolidated	$	446	$	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 nine months ended September 30, 2017 and 2016:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2017
Average daily commercial paper outstanding	$	669		$	7		$	78		$	754
Weighted-average interest rate	1.27		%	1.20		%	1.28		%	1.27		%
Peak commercial paper during period(a)	$	841		$	64		$	193		$	948
Peak interest rate	1.50		%	1.41		%	1.50		%	1.50		%
2016
Average daily commercial paper outstanding	$	435		$	80		$	48		$	563
Weighted-average interest rate	0.81		%	0.74		%	0.72		%	0.79		%
Peak commercial paper during period(a)	$	574		$	208		$	195		$	839
Peak interest rate	0.95		%	0.85		%	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.