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

9 Months Ended

Sep. 30, 2016

Schedule of Commercial paper [Abstract]

Schedule of Short-term Debt

The following table presents commercial paper outstanding as of September 30, 2016, and December 31, 2015:

	2016		2015
Ameren (parent)	$	451	$	301
Ameren Missouri	—		—
Ameren Illinois	157		—
Ameren Consolidated	$	608	$	301

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, 2016 and 2015:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
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		%
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		%

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