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Reportable Business Segments (Tables)
6 Months Ended
Jun. 30, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Financial data for business segments is as follows (in millions):
 
For the Three Months Ended June 30, 2015
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Electric Transmission & Distribution
$
705

(1) 
$

 
$
158

 
Natural Gas Distribution
420

 
7

 
19

 
Energy Services
404

 
4

 
9

 
Midstream Investments (2)

 

 

 
Other Operations
3

 

 

 
Eliminations

 
(11
)
 

 
Consolidated
$
1,532


$

 
$
186

 

 
For the Three Months Ended June 30, 2014
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Electric Transmission & Distribution
$
698

(1) 
$

 
$
145

 
Natural Gas Distribution
526

 
6

 
30

 
Energy Services
657

 
19

 
11

 
Midstream Investments (2)

 

 

 
Other Operations
3

 

 

 
Eliminations

 
(25
)
 

 
Consolidated
$
1,884

 
$

 
$
186

 

 
For the Six Months Ended June 30, 2015
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Total Assets as of June 30, 2015
 
Electric Transmission & Distribution
$
1,317

(1) 
$

 
$
254

 
$
9,944

 
Natural Gas Distribution
1,605

 
15

 
165

 
5,301

 
Energy Services
1,036

 
22

 
22

 
837

 
Midstream Investments (2)

 

 

 
4,471

 
Other Operations
7

 

 
1

 
2,999

(3) 
Eliminations

 
(37
)
 

 
(950
)
 
Consolidated
$
3,965

 
$

 
$
442

 
$
22,602

 

 
For the Six Months Ended June 30, 2014
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Total Assets as of December 31, 2014
 
Electric Transmission & Distribution
$
1,327

(1) 
$

 
$
250

 
$
10,066

 
Natural Gas Distribution
2,004

 
15

 
192

 
5,464

 
Energy Services
1,709

 
51

 
37

 
978

 
Midstream Investments (2)

 

 

 
4,521

 
Other Operations
7

 

 
2

 
3,368

(3) 
Eliminations

 
(66
)
 

 
(1,197
)
 
Consolidated
$
5,047

 
$

 
$
481

 
$
23,200

 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
CenterPoint Houston’s transmission and distribution revenues from major customers are as follows (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Affiliates of NRG
 
$
172

 
$
164

 
$
356

 
$
330

 
 
 
 
 
 
 
 
 
Affiliates of Energy Future Holdings Corp.
 
$
51

 
$
41

 
$
103

 
$
81

Midstream Investments [Table Text Block]
Midstream Investments’ equity earnings are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
(in millions)
Enable
 
$
43

 
$
69

 
$
95

 
$
157

SESH
 

 
2

 

 
5

  Total
 
$
43

 
$
71

 
$
95

 
$
162


Midstream Investments’ total assets are as follows:
 
 
June 30,
2015
 
December 31, 2014
 
 
(in millions)
Enable
 
$
4,471

 
$
4,520

SESH
 

 
1

  Total
 
$
4,471

 
$
4,521