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Segment Information
 9 Months Ended
Sep. 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 nine months ended September 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
$
1,104

 
$
405

 
$
111

 
$
105

 
$
(2
)
  
$
—

 
$
1,723

 
Intersegment revenues
11

 
—

 
1

 
14

(a) 
—

  
(26
)
 
—

 
Net income attributable to Ameren common shareholders
234

 
31

 
2

 
38

(b) 
(17
)
 
—

 
288

 
Capital expenditures
178

 
112

 
71

 
173

 
(2
)
 
(7
)
 
525

 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
1,150

 
$
502

 
$
113

 
$
94

 
$
—

 
$
—

 
$
1,859

 
Intersegment revenues
15

 
1

 
1

 
14

(a) 
—

 
(31
)
 
—

 
Net income attributable to Ameren common shareholders
241

 
93

 
2

 
39

(b) 
(6
)
 
—

 
369

 
Capital expenditures
147

 
123

 
50

 
175

 
1

 
—

 
496

 
Nine Months
  
 
 
 
  
 
 
 
  
 
  
 
  
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
2,799

 
$
1,176

 
$
509

 
$
293

 
$
(2
)
 
$
—

 
$
4,775

 
Intersegment revenues
41

 
3

 
1

 
33

(a) 
—

 
(78
)
 
—

 
Net income attributable to Ameren common shareholders
359

 
94

 
40

 
106

(b) 
(16
)
 
—

 
583

 
Capital expenditures
533

 
354

 
180

 
463

 
3

 
(10
)
 
1,523

 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
2,733

 
$
1,210

 
$
529

 
$
247

 
$
1

 
$
—

 
$
4,720

 
Intersegment revenues
40

 
3

 
1

 
36

(a) 
—

 
(80
)
 
—

 
Net income attributable to Ameren common shareholders
347

 
122

 
44

 
98

(b) 
10

 
—

 
621

 
Capital expenditures
500

 
359

 
130

 
503

 
4

 
—

 
1,496

 

(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
$
405

 
$
112

 
$
58

 
$
—

 
$
575

Intersegment revenues
—

 
—

 
14

(a) 
(14
)
 
—

Net income available to common shareholder
31

 
2

 
22

 
—

 
55

Capital expenditures
112

 
71

 
93

 
—

 
276

2016
 
 
 
 
 
 
 
 
 
External revenues
$
503

 
$
114

 
$
59

 
$
—

 
$
676

Intersegment revenues
—

 
—

 
14

(a) 
(14
)
 
—

Net income available to common shareholder
93

 
2

 
24

 
—

 
119

Capital expenditures
123

 
50

 
68

 
—

 
241

Nine Months
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
External revenues
$
1,179

 
$
510

 
$
165

 
$
—

 
$
1,854

Intersegment revenues
—

 
—

 
32

(a) 
(32
)
 
—

Net income available to common shareholder
94

 
40

 
57

 
—

 
191

Capital expenditures
354

 
180

 
226

 
—

 
760

2016
 
 
 
 
 
 
 
 
 
External revenues
$
1,213

 
$
530

 
$
152

 
$
—

 
$
1,895

Intersegment revenues
—

 
—

 
35

(a) 
(35
)
 
—

Net income available to common shareholder
122

 
44

 
57

 
—

 
223

Capital expenditures
359

 
130

 
194

 
—

 
683


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