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Reportable Business Segments
6 Months Ended
Jun. 30, 2012
Reportable Business Segments [Abstract]  
Reportable Business Segments
Reportable Business Segments

CenterPoint Energy’s determination of reportable business segments considers the strategic operating units under which CenterPoint Energy manages sales, allocates resources and assesses performance of various products and services to wholesale or retail customers in differing regulatory environments. CenterPoint Energy uses operating income as the measure of profit or loss for its business segments.

CenterPoint Energy’s reportable business segments include the following: Electric Transmission & Distribution, Natural Gas Distribution, Competitive Natural Gas Sales and Services, Interstate Pipelines, Field Services and Other Operations. The electric transmission and distribution function (CenterPoint Houston) is reported in the Electric Transmission & Distribution business segment. Natural Gas Distribution consists of intrastate natural gas sales to, and natural gas transportation and distribution for, residential, commercial, industrial and institutional customers. Competitive Natural Gas Sales and Services represents CenterPoint Energy’s non-rate regulated gas sales and services operations. The Interstate Pipelines business segment includes the interstate natural gas pipeline operations. The Field Services business segment includes the non-rate regulated natural gas gathering, processing and treating operations. Other Operations consists primarily of other corporate operations which support all of CenterPoint Energy’s business operations.

Financial data for business segments are as follows (in millions):

 
For the Three Months Ended June 30, 2011
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
Electric Transmission & Distribution
$
606

(1) 
$

 
$
185

Natural Gas Distribution
448

 
4

 
13

Competitive Natural Gas Sales and Services
581

 
5

 
3

Interstate Pipelines
111

 
31

 
60

Field Services
88

 
10

 
39

Other Operations
3

 

 
3

Eliminations

 
(50
)
 

Consolidated
$
1,837

 
$

 
$
303

 
 
 
 
 
 
 
For the Three Months Ended June 30, 2012
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income (Loss)
Electric Transmission & Distribution
$
676

(1) 
$

 
$
191

Natural Gas Distribution
360

 
6

 
9

Competitive Natural Gas Sales and Services
302

 
6

 
(4
)
Interstate Pipelines
88

 
37

 
52

Field Services
96

 
8

 
51

Other Operations
3

 

 
3

Eliminations

 
(57
)
 

Consolidated
$
1,525

 
$

 
$
302


 
For the Six Months Ended June 30, 2011
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Total Assets
as of December 31,
2011
 
Electric Transmission & Distribution
$
1,095

(1) 
$

 
$
286

 
$
11,221

 
Natural Gas Distribution
1,655

 
9

 
155

 
4,636

 
Competitive Natural Gas Sales and Services
1,278

 
14

 
13

 
1,089

 
Interstate Pipelines
224

 
65

 
136

 
3,867

 
Field Services
166

 
22

 
75

 
1,894

 
Other Operations
6

 

 
2

 
2,318

(2) 
Eliminations

 
(110
)
 

 
(3,322
)
 
Consolidated
$
4,424

 
$

 
$
667

 
$
21,703

 
 
 
 
 
 
 
 
 
 
 
For the Six Months Ended June 30, 2012
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income (Loss)
 
Total Assets
as of June 30, 2012
 
Electric Transmission & Distribution
$
1,207

(1) 
$

 
$
298

 
$
11,128

 
Natural Gas Distribution
1,209

 
11

 
130

 
4,503

 
Competitive Natural Gas Sales and Services
822

 
11

 
(3
)
 
1,023

 
Interstate Pipelines
170

 
82

 
112

 
3,935

 
Field Services
195

 
14

 
98

 
1,976

 
Other Operations
6

 

 
5

 
2,115

(2) 
Eliminations

 
(118
)
 

 
(2,205
)
 
Consolidated
$
3,609

 
$

 
$
640

 
$
22,475

 
________________
(1)
Sales to affiliates of NRG in the three months ended June 30, 2011 and 2012 represented approximately $133 million and $153 million, respectively, of CenterPoint Houston’s transmission and distribution revenues.  Sales to affiliates of Energy Future Holdings Corp. in the three months ended June 30, 2011 and 2012 represented approximately $41 million and $38 million, respectively, of CenterPoint Houston’s transmission and distribution revenues. Sales to affiliates of NRG in the six months ended June 30, 2011 and 2012 represented approximately $259 million and $293 million, respectively, of CenterPoint Houston’s transmission and distribution revenues.  Sales to affiliates of Energy Future Holdings Corp. in the six months ended June 30, 2011 and 2012 represented approximately $82 million and $74 million, respectively, of CenterPoint Houston’s transmission and distribution revenues.

(2)
Included in total assets of Other Operations as of December 31, 2011 and June 30, 2012 are pension and other postemployment related regulatory assets of $796 million and $769 million, respectively.