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Segment Information
 6 Months Ended
Jun. 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 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.