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

9 Months Ended

Sep. 30, 2015

Schedule of Commercial paper [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding at Ameren (parent), Ameren Missouri, and Ameren Illinois as of September 30, 2015, and December 31, 2014:

	September 30, 2015		December 31, 2014
Ameren (parent)	$	783	$	585
Ameren Missouri	—		97
Ameren Illinois	—		32
Ameren Consolidated	$	783	$	714

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, 2015 and 2014:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2015
Average daily commercial paper outstanding	$	770		$	56		$	6		$	832
Weighted-average interest rate	0.56		%	0.50		%	0.44		%	0.56		%
Peak commercial paper during period(a)	$	874		$	294		$	48		$	1,108
Peak interest rate	0.70		%	0.60		%	0.60		%	0.70		%
2014
Average daily commercial paper outstanding	$	386		$	141		$	157		$	609
Weighted-average interest rate	0.36		%	0.38		%	0.31		%	0.35		%
Peak commercial paper during period(a)	$	531		$	495		$	300		$	907
Peak interest rate	0.75		%	0.70		%	0.34		%	0.75		%

(a) The timing of peak commercial paper issuances varies by company, and therefore the peak amounts presented by company might not equal the Ameren Consolidated peak commercial paper issuances for the period.