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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Segment Financial Information
Segment Financial Information

For the Years Ended December 31,
 
Regulated Distribution
 
Regulated Transmission
 
Competitive Energy Services
 
Corporate/ Other
 
Reconciling Adjustments
 
Consolidated
 
 
(In millions)
 
 
 
 
 
 
 
 
 
 
 
 
 
2014
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,102

 
$
769

 
$
5,470

 
$
(146
)
 
$
(146
)
 
$
15,049

Internal revenues
 
—

 
—

 
819

 
—

 
(819
)
 
—

Total revenues
 
9,102

 
769

 
6,289

 
(146
)
 
(965
)
 
15,049

Depreciation
 
658

 
127

 
387

 
48

 
—

 
1,220

Amortization of regulatory assets, net
 
1

 
11

 
—

 
—

 
—

 
12

Investment income
 
56

 
—

 
45

 
11

 
(40
)
 
72

Interest expense
 
589

 
131

 
189

 
168

 
(4
)
 
1,073

Income taxes (benefits)
 
227

 
121

 
(226
)
 
(175
)
 
11

 
(42
)
Income (loss) from continuing operations
 
465

 
223

 
(423
)
 
(52
)
 
—

 
213

Discontinued operations, net of tax
 
—

 
—

 
86

 
—

 
—

 
86

Net income (loss)
 
465

 
223

 
(337
)
 
(52
)
 
—

 
299

Total assets
 
28,232

 
6,352

 
16,743

 
839

 
—

 
52,166

Total goodwill
 
5,092

 
526

 
800

 
—

 
—

 
6,418

Property additions
 
972

 
1,329

 
939

 
72

 
—

 
3,312

 
 
 
 
 
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
8,720

 
$
731

 
$
5,728

 
$
(121
)
 
$
(166
)
 
$
14,892

Internal revenues
 
—

 
—

 
770

 
—

 
(770
)
 
—

Total revenues
 
8,720

 
731

 
6,498

 
(121
)
 
(936
)
 
14,892

Depreciation
 
606

 
114

 
439

 
43

 
—

 
1,202

Amortization of regulatory assets, net
 
529

 
10

 
—

 
—

 
—

 
539

Investment income
 
57

 
—

 
11

 
9

 
(44
)
 
33

Interest expense
 
543

 
93

 
222

 
148

 
10

 
1,016

Income taxes (benefits)
 
301

 
129

 
(141
)
 
(104
)
 
10

 
195

Income (loss) from continuing operations
 
501

 
214

 
(237
)
 
(103
)
 
—

 
375

Discontinued operations, net of tax
 
—

 
—

 
17

 
—

 
—

 
17

Net income (loss)
 
501

 
214

 
(220
)
 
(103
)
 
—

 
392

Total assets
 
27,683

 
5,247

 
16,782

 
712

 
—

 
50,424

Total goodwill
 
5,092

 
526

 
800

 
—

 
—

 
6,418

Property additions
 
1,272

 
461

 
827

 
78

 
—

 
2,638

 
 
 
 
 
 
 
 
 
 
 
 
 
2012
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,047

 
$
735

 
$
5,778

 
$
(119
)
 
$
(188
)
 
$
15,253

Internal revenues
 
—

 
—

 
866

 
—

 
(864
)
 
2

Total revenues
 
9,047

 
735

 
6,644

 
(119
)
 
(1,052
)
 
15,255

Depreciation
 
558

 
114

 
409

 
38

 
—

 
1,119

Amortization of regulatory assets, net
 
(65
)
 
(3
)
 
—

 
—

 
—

 
(68
)
Investment income (loss)
 
84

 
1

 
66

 
(5
)
 
(69
)
 
77

Interest expense
 
540

 
92

 
284

 
85

 
—

 
1,001

Income taxes (benefits)
 
295

 
133

 
83

 
(34
)
 
68

 
545

Income (loss) from continuing operations
 
540

 
226

 
199

 
(155
)
 
(55
)
 
755

Discontinued operations, net of tax
 
—

 
—

 
16

 
—

 
—

 
16

Net income (loss)
 
540

 
226

 
215

 
(155
)
 
(55
)
 
771

Total assets
 
27,150

 
4,865

 
18,087

 
392

 
—

 
50,494

Total goodwill
 
5,025

 
526

 
896

 
—

 
—

 
6,447

Property additions
 
1,074

 
507

 
1,014

 
83

 
—

 
2,678