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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Segment Financial Information
Segment Financial Information

For the Three Months Ended
 
Regulated Distribution
 
Regulated Transmission
 
Competitive Energy Services
 
Corporate/ Other
 
Reconciling Adjustments
 
Consolidated
 
 
(In millions)
 
 
 
 
 
 
 
 
 
 
 
 
 
June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
2,200

 
$
264

 
$
1,008

 
$
(39
)
 
$
(32
)
 
$
3,401

Internal revenues
 
—

 
—

 
108

 
—

 
(108
)
 
—

Total revenues
 
2,200

 
264

 
1,116

 
(39
)
 
(140
)
 
3,401

Depreciation
 
170

 
44

 
103

 
17

 
—

 
334

Amortization of regulatory assets, net
 
61

 
2

 
—

 
—

 
—

 
63

Impairment of assets (Note 2)
 
—

 
—

 
1,447

 
—

 
—

 
1,447

Investment income
 
13

 
—

 
18

 
—

 
(12
)
 
19

Interest expense
 
145

 
42

 
48

 
54

 
—

 
289

Income taxes (benefits)
 
84

 
42

 
(230
)
 
(27
)
 
1

 
(130
)
Net income (loss)
 
146

 
71

 
(1,259
)
 
(47
)
 
—

 
(1,089
)
Total assets
 
27,907

 
7,855

 
15,464

 
175

 
—

 
51,401

Total goodwill
 
5,092

 
526

 
—

 
—

 
—

 
5,618

Property additions
 
313

 
251

 
213

 
17

 
—

 
794

 
 
 
 
 
 
 
 
 
 
 
 
 
June 30, 2015
 
 

 
 

 
 

 
 

 
 
 
 

External revenues
 
$
2,239

 
$
269

 
$
1,034

 
$
(42
)
 
$
(35
)
 
$
3,465

Internal revenues
 
—

 
—

 
162

 
—

 
(162
)
 
—

Total revenues
 
2,239

 
269

 
1,196

 
(42
)
 
(197
)
 
3,465

Depreciation
 
170

 
38

 
99

 
15

 
—

 
322

Amortization of regulatory assets, net
 
57

 
2

 
—

 
—

 
—

 
59

Impairment of assets
 
—

 
—

 
16

 
—

 
—

 
16

Investment income (loss)
 
12

 
—

 
—

 
(5
)
 
(10
)
 
(3
)
Interest expense
 
146

 
40

 
48

 
49

 
(1
)
 
282

Income taxes (benefits)
 
91

 
52

 
(4
)
 
(22
)
 
(2
)
 
115

Net income (loss)
 
156

 
89

 
(8
)
 
(50
)
 
—

 
187

Total assets
 
28,006

 
6,855

 
16,417

 
893

 
—

 
52,171

Total goodwill
 
5,092

 
526

 
800

 
—

 
—

 
6,418

Property additions
 
312

 
297

 
191

 
18

 
—

 
818

 
 
 
 
 
 
 
 
 
 
 
 
 
For the Six Months Ended
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
4,721

 
$
539

 
$
2,160

 
$
(81
)
 
$
(69
)
 
$
7,270

Internal revenues
 
—

 
—

 
260

 
—

 
(260
)
 
—

Total revenues
 
4,721

 
539

 
2,420

 
(81
)
 
(329
)
 
7,270

Depreciation
 
339

 
87

 
205

 
32

 
—

 
663

Amortization of regulatory assets, net
 
120

 
4

 
—

 
—

 
—

 
124

Impairment of assets (Note 2)
 
—

 
—

 
1,447

 
—

 
—

 
1,447

Investment income
 
24

 
—

 
33

 
11

 
(21
)
 
47

Interest expense
 
292

 
85

 
95

 
105

 
—

 
577

Income taxes (benefits)
 
182

 
85

 
(145
)
 
(40
)
 
1

 
83

Net income (loss)
 
311

 
145

 
(1,115
)
 
(102
)
 
—

 
(761
)
Property additions
 
575

 
509

 
382

 
26

 
—

 
1,492

 
 
 
 
 
 
 
 
 
 
 
 
 
June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
4,801

 
$
507

 
$
2,209

 
$
(84
)
 
$
(71
)
 
$
7,362

Internal revenues
 
—

 
—

 
422

 
—

 
(422
)
 
—

Total revenues
 
4,801

 
507

 
2,631

 
(84
)
 
(493
)
 
7,362

Depreciation
 
342

 
75

 
195

 
29

 
—

 
641

Amortization of regulatory assets, net
 
86

 
5

 
—

 
—

 
—

 
91

Impairment of assets
 
—

 
—

 
16

 
—

 
—

 
16

Investment income (loss)
 
25

 
—

 
12

 
(3
)
 
(20
)
 
14

Interest expense
 
290

 
79

 
96

 
96

 
—

 
561

Income taxes (benefits)
 
213

 
94

 
(8
)
 
(40
)
 
—

 
259

Net income (loss)
 
364

 
161

 
(16
)
 
(100
)
 
—

 
409

Property additions
 
592

 
551

 
317

 
26

 
—

 
1,486