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Segment Information
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
SEGMENT INFORMATION
SEGMENT INFORMATION
Ameren has two reportable segments: Ameren Missouri and Ameren Illinois. Ameren Missouri and Ameren Illinois each have one reportable segment. The Ameren Missouri segment for both Ameren and Ameren Missouri includes all of the operations of Ameren Missouri’s business as described in Note 1 - Summary of Significant Accounting Policies. The Ameren Illinois segment for both Ameren and Ameren Illinois includes all of the operations of Ameren Illinois’ business as described in Note 1 - Summary of Significant Accounting Policies. The category called Other primarily includes Ameren parent company activities, Ameren Services, and ATXI.
The following table presents information about the reported revenues and net income attributable to Ameren common stockholders from continuing operations for the three and nine months ended September 30, 2015 and 2014, and total assets of continuing operations as of September 30, 2015, and December 31, 2014:
Three Months
Ameren
Missouri
 
Ameren
Illinois
 
Other
 
Intersegment
Eliminations
 
Ameren
 
2015
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,160

 
$
654

 
$
19

  
$
—

 
$
1,833

 
Intersegment revenues
11

 
1

 
1

  
(13
)
 
—

 
Net income attributable to Ameren common stockholders from continuing operations
239

 
98

 
6

 
—

 
343

 
2014
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,089

 
$
572

 
$
9

 
$
—

 
$
1,670

 
Intersegment revenues
8

 
—

 
2

 
(10
)
 
—

 
Net income (loss) attributable to Ameren common stockholders from continuing operations
222

 
75

 
(3
)
 
—

 
294

 
Nine Months
  
 
  
 
  
 
  
 
  
 
2015
 
 
 
 
 
 
 
 
 
 
External revenues
$
2,825

 
$
1,910

 
$
55

 
$
—

 
$
4,790

 
Intersegment revenues
30

 
3

 
2

 
(35
)
 
—

 
Net income attributable to Ameren common stockholders from continuing operations
341

 
182

 
26

 
—

 
549

 
2014
 
 
 
 
 
 
 
 
 
 
External revenues
$
2,793

 
$
1,864

 
$
26

 
$
—

 
$
4,683

 
Intersegment revenues
21

 
1

 
3

 
(25
)
 
—

 
Net income (loss) attributable to Ameren common stockholders from continuing operations

395

 
156

 
(10
)
 
—

 
541

 
As of September 30, 2015:
 
 
 
 
 
 
 
 
 
 
Total assets
$
13,941

 
$
8,656

 
$
1,358

 
$
(513
)
 
$
23,442

(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 $17 million and $15 million as of September 30, 2015 and December 31, 2014, respectively.