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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Segment Financial Information
Segment Financial Information

For the Years Ended December 31,
 
Regulated Distribution
 
Regulated Transmission
 
Competitive Energy Services
 
Other/Corporate
 
Reconciling Adjustments
 
Consolidated
 
 
(In millions)
 
 
 
 
 
 
 
 
 
 
 
 
 
2013
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
8,738

 
$
741

 
$
5,725

 
$
(121
)
 
$
(166
)
 
$
14,917

Internal revenues
 
—

 
—

 
770

 
—

 
(770
)
 
—

Total revenues
 
8,738

 
741

 
6,495

 
(121
)
 
(936
)
 
14,917

Depreciation, amortization and deferrals
 
1,135

 
124

 
439

 
43

 
—

 
1,741

Investment income
 
57

 
—

 
14

 
9

 
(44
)
 
36

Interest expense
 
543

 
93

 
222

 
158

 
—

 
1,016

Income taxes (benefits)
 
301

 
129

 
(141
)
 
(78
)
 
(16
)
 
195

Income (loss) from continuing operations
 
501

 
214

 
(237
)
 
(130
)
 
27

 
375

Discontinued operations, net of tax
 
—

 
—

 
17

 
—

 
—

 
17

Net income (loss)
 
501

 
214

 
(220
)
 
(130
)
 
27

 
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
 
$
9,060

 
$
740

 
$
5,778

 
$
(119
)
 
$
(188
)
 
$
15,271

Internal revenues
 
—

 
—

 
866

 
—

 
(864
)
 
2

Total revenues
 
9,060

 
740

 
6,644

 
(119
)
 
(1,052
)
 
15,273

Depreciation, amortization and deferrals
 
493

 
111

 
409

 
38

 
—

 
1,051

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

 
 
 
 
 
 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,913

 
$
660

 
$
5,783

 
$
(114
)
 
$
(204
)
 
$
16,038

Internal revenues
 
—

 
—

 
1,237

 
—

 
(1,170
)
 
67

Total revenues
 
9,913

 
660

 
7,020

 
(114
)
 
(1,374
)
 
16,105

Depreciation, amortization and deferrals
 
846

 
110

 
411

 
24

 
—

 
1,391

Investment income
 
99

 
—

 
56

 
1

 
(42
)
 
114

Interest expense
 
530

 
89

 
298

 
91

 
—

 
1,008

Income taxes (benefits)
 
287

 
114

 
214

 
(87
)
 
38

 
566

Income (loss) from continuing operations
 
488

 
194

 
364

 
(149
)
 
(41
)
 
856

Discontinued operations, net of tax
 
—

 
—

 
13

 
—

 
—

 
13

Net income (loss)
 
488

 
194

 
377

 
(149
)
 
(41
)
 
869

Total assets
 
25,534

 
4,463

 
16,796

 
617

 
—

 
47,410

Total goodwill
 
5,025

 
526

 
890

 
—

 
—

 
6,441

Property additions
 
868

 
390

 
778

 
93

 
—

 
2,129