Segment Information (Tables)

6 Months Ended

Jun. 30, 2015

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 Corporation from continuing operations for the three and six months ended June 30, 2015 and 2014, and total assets of continuing operations as of June 30, 2015, and December 31, 2014:

Three Months	Ameren Missouri		Ameren Illinois		Other			Intersegment Eliminations			Ameren
2015
External revenues	$	872	$	512	$	17		$	—		$	1,401
Intersegment revenues	12		1		—			(13		)	—
Net income attributable to Ameren Corporation from continuing operations	61		31		6			—			98
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
Six Months
2015
External revenues	$	1,665	$	1,256	$	36		$	—		$	2,957
Intersegment revenues	19		2		1			(22		)	—
Net income attributable to Ameren Corporation from continuing operations	102		84		20			—			206
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
As of June 30, 2015:
Total assets	$	13,721	$	8,500	$	1,036		$	(120	)	$	23,137	(a)
As of December 31, 2014:
Total assets	$	13,541	$	8,381	$	942		$	(203	)	$	22,661	(a)

(a)    Excludes total assets from discontinued operations of $15 million as of June 30, 2015, and December 31, 2014.