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Segment Information
 3 Months Ended
Mar. 31, 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, and associated Ameren (parent) interest charges. 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 and Ameren Illinois.
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 information about the reported revenues and specified items reflected in net income attributable to common shareholders and capital expenditures at Ameren and Ameren Illinois for the three months ended March 31, 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
$
772

 
$
384

 
$
264

 
$
96

 
$
(2
)
  
$
—

 
$
1,514

 
Intersegment revenues
18

 
1

 
—

 
6

(a) 
—

  
(25
)
 
—

 
Net income attributable to Ameren common shareholders
5

 
30

 
33

 
34

 
—

 
—

 
102

 
Capital expenditures
196

 
120

 
51

 
134

 
4

(b) 
(1
)
 
504

 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
$
726

 
$
351

 
$
285

 
$
72

 
$
—

 
$
—

 
$
1,434

 
Intersegment revenues
15

 
1

 
—

 
11

(a) 
—

 
(27
)
 
—

 
Net income attributable to Ameren common shareholders
14

 
11

 
35

 
27

 
18

 
—

 
105

 
Capital expenditures
178

 
117

 
35

 
164

 
2

(b) 
—

 
496

 

(a)
Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. See discussion of transactions above.
(b)
Includes the elimination of intercompany transfers.    
Ameren Illinois
 
Ameren Illinois Electric Distribution
 
Ameren Illinois Natural Gas
 
Ameren Illinois Transmission
 
Intersegment
Eliminations
 
Consolidated
2017
 
 
 
 
 
 
 
 
 
External revenues
$
385

 
$
264

 
$
54

 
$
—

 
$
703

Intersegment revenues
—

 
—

 
6

(a) 
(6
)
 
—

Net income available to common shareholder
30

 
33

 
16

 
—

 
79

Capital expenditures
120

 
51

 
56

 
—

 
227

2016
 
 
 
 
 
 
 
 
 
External revenues
$
352

 
$
285

 
$
40

 
$
—

 
$
677

Intersegment revenues
—

 
—

 
11

(a) 
(11
)
 
—

Net income available to common shareholder
11

 
35

 
13

 
—

 
59

Capital expenditures
117

 
35

 
59

 
—

 
211


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