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Segment Information
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
SEGMENT INFORMATION
SEGMENT INFORMATION
Ameren has four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. The Ameren Missouri segment includes all of the operations of Ameren Missouri. Ameren Illinois Electric Distribution consists of the electric distribution business of Ameren Illinois. Ameren Illinois Natural Gas consists of the natural gas business of Ameren Illinois. Ameren Transmission is primarily composed of the aggregated electric transmission businesses of Ameren Illinois and ATXI. The category called Other primarily includes Ameren parent company activities and Ameren Services.
Ameren Missouri has one segment. Ameren Illinois has three segments: Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Illinois Transmission. See Note 1 – Summary of Significant Accounting Policies for additional information regarding the operations of Ameren Missouri, Ameren Illinois, and ATXI.
Segment operating revenues and a majority of operating expenses are directly recognized and incurred by Ameren Illinois to each Ameren Illinois segment. Common operating expenses, miscellaneous income and expenses, interest charges, and income tax expense are allocated by Ameren Illinois to each Ameren Illinois segment based on certain factors, which primarily relate to the nature of the cost. Additionally, Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. The transmission expense for Illinois customers who have elected to purchase their power from Ameren Illinois is recovered through a cost recovery mechanism with no net effect on Ameren Illinois Electric Distribution earnings, as costs are offset by corresponding revenues. Transmission revenues from these transactions are reflected at Ameren Transmission and Ameren Illinois Transmission. An intersegment elimination at Ameren and Ameren Illinois occurs to eliminate these transmission revenues and expenses.
The following tables present revenues, net income attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2017 and 2016. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount.
Ameren
Three Months
Ameren
Missouri
 
Ameren Illinois Electric Distribution
 
Ameren Illinois Natural Gas
 
Ameren Transmission
 
Other
 
Intersegment
Eliminations
 
Consolidated
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
923

 
$
387

 
$
134

 
$
92

 
$
2

  
$
—

 
$
1,538

 
Intersegment revenues
12

 
2

 
—

 
13

(a) 
—

  
(27
)
 
—

 
Net income attributable to Ameren common shareholders
120

 
33

 
5

 
34

(b) 
1

 
—

 
193

 
Capital expenditures
159

 
122

 
58

 
156

 
1

 
(2
)
 
494

 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
857

 
$
357

 
$
131

 
$
81

 
$
1

 
$
—

 
$
1,427

 
Intersegment revenues
10

 
1

 
—

 
11

(a) 
—

 
(22
)
 
—

 
Net income attributable to Ameren common shareholders
92

 
18

 
7

 
32

(b) 
(2
)
 
—

 
147

 
Capital expenditures
175

 
119

 
45

 
164

 
1

 
—

 
504

 
Six Months
  
 
 
 
  
 
 
 
  
 
  
 
  
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,695

 
$
771

 
$
398

 
$
188

 
$
—

 
$
—

 
$
3,052

 
Intersegment revenues
30

 
3

 
—

 
19

(a) 
—

 
(52
)
 
—

 
Net income attributable to Ameren common shareholders
125

 
63

 
38

 
68

(b) 
1

 
—

 
295

 
Capital expenditures
355

 
242

 
109

 
290

 
5

 
(3
)
 
998

 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,583

 
$
708

 
$
416

 
$
153

 
$
1

 
$
—

 
$
2,861

 
Intersegment revenues
25

 
2

 
—

 
22

(a) 
—

 
(49
)
 
—

 
Net income attributable to Ameren common shareholders
106

 
29

 
42

 
59

(b) 
16

 
—

 
252

 
Capital expenditures
353

 
236

 
80

 
328

 
3

 
—

 
1,000

 

(a)
Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. See discussion of transactions above.
(b)
Ameren Transmission earnings include an allocation of financing costs from Ameren (parent).

Ameren Illinois
Three Months
Ameren Illinois Electric Distribution
 
Ameren Illinois Natural Gas
 
Ameren Illinois Transmission
 
Intersegment
Eliminations
 
Consolidated
2017
 
 
 
 
 
 
 
 
 
External revenues
$
389

 
$
134

 
$
53

 
$
—

 
$
576

Intersegment revenues
—

 
—

 
12

(a) 
(12
)
 
—

Net income available to common shareholder
33

 
5

 
19

 
—

 
57

Capital expenditures
122

 
58

 
77

 
—

 
257

2016
 
 
 
 
 
 
 
 
 
External revenues
$
358

 
$
131

 
$
53

 
$
—

 
$
542

Intersegment revenues
—

 
—

 
10

(a) 
(10
)
 
—

Net income available to common shareholder
18

 
7

 
20

 
—

 
45

Capital expenditures
119

 
45

 
67

 
—

 
231

Six Months
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
External revenues
$
774

 
$
398

 
$
107

 
$
—

 
$
1,279

Intersegment revenues
—

 
—

 
18

(a) 
(18
)
 
—

Net income available to common shareholder
63

 
38

 
35

 
—

 
136

Capital expenditures
242

 
109

 
133

 
—

 
484

2016
 
 
 
 
 
 
 
 
 
External revenues
$
710

 
$
416

 
$
93

 
$
—

 
$
1,219

Intersegment revenues
—

 
—

 
21

(a) 
(21
)
 
—

Net income available to common shareholder
29

 
42

 
33

 
—

 
104

Capital expenditures
236

 
80

 
126

 
—

 
442


(a)
Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. See discussion of transactions above.