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Reportable Business Segments (Tables)
6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Financial data for business segments is as follows:

 
For the Three Months Ended June 30, 2016
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
(in millions)
Electric Transmission & Distribution
$
763

(1)
$

 
$
158

Natural Gas Distribution
414

 
7

 
20

Energy Services
393

 
4

 

Midstream Investments (2)

 

 

Other Operations
4

 

 
4

Eliminations

 
(11
)
 

Consolidated
$
1,574

 
$

 
$
182

 
For the Three Months Ended June 30, 2015
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
(in millions)
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 Six Months Ended June 30, 2016
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Total Assets as of June 30, 2016
 
 
(in millions)
 
Electric Transmission & Distribution
$
1,423

(1)
$

 
$
241

 
$
10,065

 
Natural Gas Distribution
1,302

 
14

 
180

 
5,585

 
Energy Services
825

 
11

 
6

 
973

 
Midstream Investments (2)

 

 

 
2,536

 
Other Operations
8

 

 
5

 
2,771

(3)
Eliminations

 
(25
)
 

 
(918
)
 
Consolidated
$
3,558

 
$

 
$
432

 
$
21,012

 


 
For the Six Months Ended June 30, 2015
 
 
 
 
Revenues from
External
Customers
 
Net
Intersegment
Revenues
 
Operating
Income
 
Total Assets as of December 31, 2015
 
 
(in millions)
 
Electric Transmission & Distribution
$
1,317

(1)
$

 
$
254

 
$
10,028

 
Natural Gas Distribution
1,605

 
15

 
165

 
5,657

 
Energy Services
1,036

 
22

 
22

 
857

 
Midstream Investments (2)

 

 

 
2,594

 
Other Operations
7

 

 
1

 
2,879

(3)
Eliminations

 
(37
)
 

 
(725
)
 
Consolidated
$
3,965

 
$

 
$
442

 
$
21,290

 


(1)
Electric Transmission & Distribution revenues from major customers are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Affiliates of NRG
 
$
159

 
$
172

 
$
304

 
$
356

Affiliates of Energy Future Holdings Corp.
 
$
50

 
$
51

 
$
95

 
$
103



(2)
Midstream Investments’ equity earnings are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Enable
 
$
31

 
$
43

 
$
91

 
$
95


Midstream Investments’ total assets are as follows:
 
 
June 30, 2016
 
December 31, 2015
 
 
(in millions)
Enable
 
$
2,536

 
$
2,594



(3)
Included in total assets of Other Operations as of June 30, 2016 and December 31, 2015 are pension and other postemployment-related regulatory assets of $791 million and $814 million, respectively.
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Electric Transmission & Distribution revenues from major customers are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Affiliates of NRG
 
$
159

 
$
172

 
$
304

 
$
356

Affiliates of Energy Future Holdings Corp.
 
$
50

 
$
51

 
$
95

 
$
103

Midstream Investments [Table Text Block]
Midstream Investments’ equity earnings are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
Enable
 
$
31

 
$
43

 
$
91

 
$
95


Midstream Investments’ total assets are as follows:
 
 
June 30, 2016
 
December 31, 2015
 
 
(in millions)
Enable
 
$
2,536

 
$
2,594