Short-Term Debt And Liquidity (Tables)

12 Months Ended

Dec. 31, 2016

Short-term Debt [Line Items]

Schedule Of Maximum Aggregate Amount Available On Credit Agreements

The following table presents the maximum aggregate amount available to each borrower under each facility (the amount being each borrower's "Borrowing Sublimit"):

	Missouri Credit Agreement		Illinois Credit Agreement
Ameren	$	700	$	500
Ameren Missouri	800		(a)
Ameren Illinois	(a)		800

(a) Not applicable.

Schedule of Commercial Paper

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 years ended December 31, 2016 and 2015:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2016
Average daily commercial paper outstanding	$	440		$	60		$	52		$	552
Outstanding borrowings at period-end	507			—			51			558
Weighted-average interest rate	0.82		%	0.74		%	0.69		%	0.80		%
Peak outstanding commercial paper during period(a)	$	574		$	208		$	195		$	839
Peak interest rate	1.05		%	0.85		%	0.90		%	1.05		%
2015
Average daily commercial paper outstanding	$	721		$	42		$	4		$	767
Outstanding borrowings at period-end	301			—			—			301
Weighted-average interest rate	0.57		%	0.50		%	0.44		%	0.55		%
Peak outstanding commercial paper during period(a)	$	874		$	294		$	48		$	1,108
Peak interest rate	0.91		%	0.60		%	0.60		%	0.91		%

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