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Selected Quarterly Information
12 Months Ended
Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]  
SELECTED QUARTERLY INFORMATION
SELECTED QUARTERLY INFORMATION (Unaudited) (In millions, except per share amounts)
Ameren
2014
 
 
2013
Quarter ended (a)
March 31
 
June 30
 
September 30
 
December 31
 
 
March 31
 
June 30
 
September 30
 
December 31
Operating revenues
$
1,594

 
$
1,419

 
$
1,670

 
$
1,370

 
 
$
1,475

 
$
1,403

 
$
1,638

 
$
1,322

Operating income
246

 
322

 
561

 
125

 
 
185

 
261

 
567

 
171

Net income (loss)
98

 
150

 
295

 
49

 
 
(143
)
 
96

 
304

 
38

Net income attributable to Ameren Corporation – continuing operations
$
97

 
$
150

 
$
294

 
$
46

 
 
$
54

 
$
105

 
$
305

 
$
48

Net income (loss) attributable to Ameren Corporation – discontinued operations
(1
)
 
(1
)
 
(1
)
 
2

 
 
(199
)
 
(10
)
 
(3
)
 
(11
)
Net income (loss) attributable to Ameren Corporation
$
96

 
$
149

 
$
293

 
$
48

 
 
$
(145
)
 
$
95

 
$
302

 
$
37

Earnings per common share – basic – continuing operations
$
0.40

 
$
0.62

 
$
1.21

 
$
0.19

 
 
$
0.22

 
$
0.44

 
$
1.26

 
$
0.19

Earnings (loss) per common share – basic – discontinued operations

 
(0.01
)
 

 
0.01

 
 
(0.82
)
 
(0.05
)
 
(0.01
)
 
(0.04
)
Earnings (loss) per common share – basic
$
0.40

 
$
0.61

 
$
1.21

 
$
0.20

 
 
$
(0.60
)
 
$
0.39

 
$
1.25

 
$
0.15

Earnings per common share – diluted – continuing operations
$
0.40

 
$
0.62

 
$
1.20

 
$
0.19

 
 
$
0.22

 
$
0.44

 
$
1.25

 
$
0.19

Earnings (loss) per common share – diluted – discontinued operations

 
(0.01
)
 

 
0.01

 
 
(0.82
)
 
(0.05
)
 
(0.01
)
 
(0.04
)
Earnings (loss) per common share – diluted
$
0.40

 
$
0.61

 
$
1.20

 
$
0.20

 
 
$
(0.60
)
 
$
0.39

 
$
1.24

 
$
0.15

(a)
The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and to changes in the number of weighted-average shares outstanding each period.

Ameren Missouri Quarter ended
 
Operating
Revenues
 
Operating
Income
 
Net Income
 (Loss)
 
Net Income (Loss)
Available
to Common
Stockholder
March 31, 2014
 
$
817

 
$
119

 
$
48

 
$
47

March 31, 2013
 
796

 
111

 
41

 
40

June 30, 2014
 
900

 
243

 
127

 
126

June 30, 2013
 
889

 
179

 
85

 
84

September 30, 2014
 
1,097

 
394

 
223

 
222

September 30, 2013
 
1,093

 
417

 
239

 
238

December 31, 2014
 
739

 
29

 
(5
)
 
(5
)
December 31, 2013
 
763

 
96

 
33

 
33


Ameren Illinois Quarter ended
 
Operating
Revenues
 
Operating
Income
 
Net Income
 
Net Income
Available
to Common
Stockholder
March 31, 2014
 
$
774

 
$
120

 
$
54

 
$
53

March 31, 2013
 
684

 
85

 
32

 
31

June 30, 2014
 
519

 
75

 
29

 
28

June 30, 2013
 
516

 
87

 
32

 
31

September 30, 2014
 
572

 
158

 
75

 
75

September 30, 2013
 
547

 
158

 
77

 
77

December 31, 2014
 
633

 
97

 
46

 
45

December 31, 2013
 
564

 
85

 
22

 
21