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Segment Information
 6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
SEGMENT INFORMATION
SEGMENT INFORMATION
Ameren has two reportable segments: Ameren Missouri and Ameren Illinois. 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) activities, Ameren Services, and ATXI. In 2013, the Other category also included certain corporate activities previously included in the Merchant Generation segment.
The following table presents information about the reported revenues and specified items reflected in Ameren’s net income attributable to Ameren Corporation from continuing operations for the three and six months ended June 30, 2014, and 2013, and total assets in continuing operations as of June 30, 2014, and December 31, 2013.
Three Months
Ameren
Missouri
 
Ameren
Illinois
 
Other
 
Intersegment
Eliminations
 
Ameren
 
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

 
2013
 
 
 
 
 
 
 
 
 
 
External revenues
$
883

 
$
514

 
$
6

 
$
—

 
$
1,403

 
Intersegment revenues
6

 
2

 
—

 
(8
)
 
—

 
Net income (loss) attributable to Ameren Corporation from continuing operations
84

 
31

 
(10
)
 
—

 
105

 
Six Months
  
 
  
 
  
 
  
 
  
 
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

 
2013
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,672

 
$
1,197

 
$
9

 
$
—

 
$
2,878

 
Intersegment revenues
13

 
3

 
1

 
(17
)
 
—

 
Net income (loss) attributable to Ameren Corporation from continuing operations
124

 
62

 
(27
)
 
—

 
159

 
As of June 30, 2014:
 
 
 
 
 
 
 
 
 
 
Total assets
$
13,203

 
$
7,719

 
$
773

 
$
(122
)
 
$
21,573

(a) 
As of December 31, 2013:
 
 
 
 
 
 
 
 
 
 
Total assets
$
12,904

 
$
7,454

 
$
752

 
$
(233
)
 
$
20,877

(a) 
(a)    Excludes total assets from discontinued operations of $15 million and $165 million as of June 30, 2014, and December 31, 2013, respectively.