Short-Term Debt And Liquidity (Tables)

12 Months Ended

Dec. 31, 2014

Line of Credit Facility [Abstract]

Schedule Of Maximum Aggregate Amount Available On Credit Agreements

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

	2012 Missouri Credit Agreement		2012 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 Missouri's and Ameren Illinois' commercial paper program, for the years ended December 31, 2014 and 2013:

	Ameren (parent)			Ameren Missouri			Ameren Illinois			Ameren Consolidated
2014
Average daily commercial paper outstanding	$	423		$	110		$	165		$	639
Outstanding borrowings at period-end	585			97			32			714
Weighted-average interest rate	0.36		%	0.38		%	0.32		%	0.36		%
Peak commercial paper during period(a)	$	625		$	495		$	300		$	910
Peak interest rate	0.75		%	0.70		%	0.60		%	0.75		%
2013
Average daily commercial paper outstanding	$	54		$	—		$	—		$	54
Outstanding borrowings at period-end	368			—			—			368
Weighted-average interest rate	0.56		%	—		%	—		%	0.56		%
Peak commercial paper during period(a)	$	368		$	—		$	—		$	368
Peak interest rate	0.85		%	—		%	—		%	0.85		%