Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Schedule of Related Party Transactions

The following table presents the impact on Ameren Missouri and Ameren Illinois of related party transactions for the years ended December 31, 2015, 2014, and 2013. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.

Agreement	Income Statement Line Item			Ameren Missouri		Ameren Illinois
Ameren Missouri power supply agreements	Operating Revenues	2015	$	15	$	(a)
with Ameren Illinois		2014		5		(a)
		2013		3		(a)
Ameren Missouri and Ameren Illinois	Operating Revenues	2015		25		4
rent and facility services		2014		21		2
		2013		21		1
Ameren Missouri and Ameren Illinois	Operating Revenues	2015		2		(b)
miscellaneous support services		2014		1		(b)
		2013		1		3
Total Operating Revenues		2015	$	42	$	4
		2014		27		2
		2013		25		4
Ameren Illinois power supply	Purchased Power	2015	$	(a)	$	15
agreements with Ameren Missouri		2014		(a)		5
		2013		(a)		3
Ameren Illinois transmission	Purchased Power	2015		(a)		2
services with ATXI		2014		(a)		2
		2013		(a)		2
Total Purchased Power		2015	$	(a)	$	17
		2014		(a)		7
		2013		(a)		5
Ameren Services support services	Other Operations and	2015	$	131	$	119
agreement	Maintenance	2014		124		109
		2013		116		93
Total Other Operations and		2015	$	131	$	119
Maintenance Expenses		2014		124		109
		2013		116		93
Money pool borrowings (advances)	Interest (Charges)	2015	$	(b)	$	(b)
	Income	2014		(b)		(b)
		2013		(b)		(b)

(a) Not applicable.

(b) Amount less than $1 million.