Segment Information (Tables)

9 Months Ended

Sep. 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 nine months ended September 30,2016 and 2015, and total assets of continuing operations as of September 30, 2016, and December 31, 2015:

Three Months	Ameren Missouri		Ameren Illinois		Other		Intersegment Eliminations			Ameren
2016
External revenues	$	1,150	$	675	$	34	$	—		$	1,859
Intersegment revenues	15		1		1		(17		)	—
Net income attributable to Ameren common shareholders from continuing operations	241		119		9		—			369
2015
External revenues	$	1,160	$	654	$	19	$	—		$	1,833
Intersegment revenues	11		1		1		(13		)	—
Net income attributable to Ameren common shareholders from continuing operations	239		98		6		—			343
Nine Months
2016
External revenues	$	2,733	$	1,892	$	95	$	—		$	4,720
Intersegment revenues	40		3		2		(45		)	—
Net income attributable to Ameren common shareholders from continuing operations	347		223		51		—			621
2015
External revenues	$	2,825	$	1,910	$	55	$	—		$	4,790
Intersegment revenues	30		3		2		(35		)	—
Net income attributable to Ameren common shareholders from continuing operations	341		182		26		—			549
As of September 30, 2016:
Total assets	$	13,889	$	9,202	$	1,496	$	(468	)	$	24,119	(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 $15 million and $14 million as of September 30, 2016, and December 31, 2015, respectively.