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Segment Information
 12 Months Ended
Dec. 31, 2012
Segment Reporting Information, Profit (Loss) [Abstract]  
SEGMENT INFORMATION
SEGMENT INFORMATION
Ameren has three reportable segments: Ameren Missouri, Ameren Illinois, and Merchant Generation. The Ameren Missouri segment for both Ameren and Ameren Missouri includes all 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 consists of all of the operations of Ameren Illinois as described in Note 1 - Summary of Significant Accounting Policies. The Merchant Generation segment for Ameren consists primarily of the operations or activities of AER, including Genco, EEI, AERG, and Marketing Company. The category called Other primarily includes Ameren parent company activities, Ameren Services, and ATXI.
The following table presents information about the reported revenues and specified items reflected in Ameren’s net income for the years ended December 31, 2012, 2011, and 2010, and total assets as of December 31, 2012, 2011, and 2010.
Ameren
 
Ameren
Missouri
 
Ameren
Illinois
Segment
 
Merchant
Generation
 
Other
 
Intersegment
Eliminations
 
Consolidated
2012
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
3,251

 
$
2,509

 
$
1,063

 
$
5

 
$
—

 
$
6,828

Intersegment revenues
21

 
16

 
310

 
4

 
(351
)
 
—

Depreciation and amortization
440

 
221

 
102

 
12

 
—

 
775

Interest and dividend income
32

 
—

 
—

 
40

 
(39
)
 
33

Interest charges
223

 
129

 
95

 
38

 
(37
)
 
448

Income taxes (benefit)
252

 
94

 
(1,019
)
 
(7
)
 
—

 
(680
)
Net income (loss) attributable to Ameren Corporation(a)
416

 
141

 
(1,516
)
(b) 
(15
)
 
—

 
(974
)
Capital expenditures
595

 
442

 
178

 
25


—

 
1,240

Total assets
13,043

 
7,282

 
1,300

 
1,228

 
(1,018
)
 
21,835

2011
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
3,358

 
$
2,774

 
$
1,394

 
$
5

 
$
—

 
$
7,531

Intersegment revenues
25

 
13

 
235

 
4

 
(277
)
 
—

Depreciation and amortization
408

 
215

 
143

 
19

 
—

 
785

Interest and dividend income
30

 
1

 
—

 
44

 
(43
)
 
32

Interest charges
209

 
136

 
105

 
44

 
(43
)
 
451

Income taxes (benefit)
161

 
127

 
32

 
(10
)
 
—

 
310

Net income (loss) attributable to Ameren Corporation(a)
287

 
193

 
45


(6
)
 
—

 
519

Capital expenditures
550

 
351

 
153

 
(24
)
(c) 
—

 
1,030

Total assets
12,757

 
7,213

 
3,833

 
1,211

 
(1,369
)
 
23,645

2010
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
3,176

 
$
3,002

 
$
1,459

 
$
1

 
$
—

 
$
7,638

Intersegment revenues
21

 
12

 
234

 
13

 
(280
)
 
—

Depreciation and amortization
382

 
210

 
146

 
27

 
—

 
765

Interest and dividend income
31

 
1

 
1

 
25

 
(25
)
 
33

Interest charges
213

 
143

 
133

 
35

 
(27
)
 
497

Income taxes (benefit)
199

 
137

 
6

 
(17
)
 
—

 
325

Net income (loss) attributable to Ameren Corporation(a)
364

 
208

 
(409
)
(b) 
(24
)
 
—

 
139

Capital expenditures
624

 
281

 
101

 
36

 
—

 
1,042

Total assets
12,504

 
7,406

 
3,934

 
1,354

 
(1,687
)
 
23,511

(a)
Represents net income (loss) available to common stockholders.
(b)
Includes noncash impairment and other charges, which were $2,578 million and $589 million before tax, recognized during the years ended December 31, 2012, and 2010, respectively. See Note 17 - Impairment and Other Charges for additional information.
(c)
Includes the elimination of intercompany transfers.