Segment Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Schedule Of Segment Reporting Information By Segment

The following table presents information about the reported revenues and specified items reflected in Ameren’s net income attributable to Ameren Corporation from continuing operations for the three and six months ended June 30, 2014, and 2013, and total assets in continuing operations as of June 30, 2014, and December 31, 2013.

Three Months	Ameren Missouri		Ameren Illinois		Other			Intersegment Eliminations			Ameren
2014
External revenues	$	893	$	518	$	8		$	—		$	1,419
Intersegment revenues	7		1		—			(8		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	126		28		(4		)	—			150
2013
External revenues	$	883	$	514	$	6		$	—		$	1,403
Intersegment revenues	6		2		—			(8		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	84		31		(10		)	—			105
Six Months
2014
External revenues	$	1,704	$	1,292	$	17		$	—		$	3,013
Intersegment revenues	13		1		1			(15		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	173		81		(7		)	—			247
2013
External revenues	$	1,672	$	1,197	$	9		$	—		$	2,878
Intersegment revenues	13		3		1			(17		)	—
Net income (loss) attributable to Ameren Corporation from continuing operations	124		62		(27		)	—			159
As of June 30, 2014:
Total assets	$	13,203	$	7,719	$	773		$	(122	)	$	21,573	(a)
As of December 31, 2013:
Total assets	$	12,904	$	7,454	$	752		$	(233	)	$	20,877	(a)

(a)    Excludes total assets from discontinued operations of $15 million and $165 million as of June 30, 2014, and December 31, 2013, respectively.