Segment Information (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30,2016 and 2015, and total assets of continuing operations as of June 30, 2016, and December 31, 2015:

Three Months	Ameren Missouri		Ameren Illinois		Other		Intersegment Eliminations			Ameren
2016
External revenues	$	857	$	541	$	29	$	—		$	1,427
Intersegment revenues	10		1		1		(12		)	—
Net income attributable to Ameren common shareholders from continuing operations	92		45		10		—			147
2015
External revenues	$	872	$	512	$	17	$	—		$	1,401
Intersegment revenues	12		1		—		(13		)	—
Net income attributable to Ameren common shareholders from continuing operations	61		31		6		—			98
Six Months
2016
External revenues	$	1,583	$	1,217	$	61	$	—		$	2,861
Intersegment revenues	25		2		1		(28		)	—
Net income attributable to Ameren common stockholders from continuing operations	106		104		42		—			252
2015
External revenues	$	1,665	$	1,256	$	36	$	—		$	2,957
Intersegment revenues	19		2		1		(22		)	—
Net income (loss) attributable to Ameren common stockholders from continuing operations	102		84		20		—			206
As of June 30, 2016:
Total assets	$	13,649	$	8,999	$	1,276	$	(145	)	$	23,779	(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 June 30, 2016, and December 31, 2015.