Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule Of Segment Reporting Information By Segment

The following table presents information about the reported revenues and net income attributable to Ameren common shareholders from continuing operations for the three months ended March 31,2016 and 2015, and total assets of continuing operations as of March 31, 2016, and December 31, 2015:

Three Months	Ameren Missouri		Ameren Illinois		Other		Intersegment Eliminations			Ameren
2016
External revenues	$	726	$	676	$	32	$	—		$	1,434
Intersegment revenues	15		1		—		(16		)	—
Net income attributable to Ameren common shareholders from continuing operations	14		59		32		—			105
2015
External revenues	$	793	$	744	$	19	$	—		$	1,556
Intersegment revenues	7		1		1		(9		)	—
Net income attributable to Ameren common shareholders from continuing operations	41		53		14		—			108
As of March 31, 2016:
Total assets	$	13,443	$	8,944	$	1,214	$	(230	)	$	23,371	(a)
As of December 31, 2015:
Total assets	$	13,851	$	8,903	$	1,139	$	(267	)	$	23,626	(a)

(a)    Excludes total assets from discontinued operations of $14 million as of March 31, 2016, and December 31, 2015.