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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2012
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)
 
 
 
 
 
 
 
 
 
 
 
 
 
2012
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
8,897

 
$
740

 
$
5,808

 
$
(119
)
 
$
(25
)
 
$
15,301

Internal revenues
 
—

 
—

 
866

 
—

 
(864
)
 
2

Total revenues
 
8,897

 
740

 
6,674

 
(119
)
 
(889
)
 
15,303

Depreciation, amortization and deferrals
 
493

 
115

 
414

 
34

 
—

 
1,056

Investment income
 
84

 
1

 
66

 
(5
)
 
(69
)
 
77

Interest expense
 
(540
)
 
(92
)
 
(284
)
 
(85
)
 
—

 
(1,001
)
Income taxes
 
295

 
133

 
91

 
(34
)
 
68

 
553

Net income
 
540

 
226

 
215

 
(155
)
 
(55
)
 
771

Total assets
 
27,150

 
4,777

 
18,087

 
392

 
—

 
50,406

Total goodwill
 
5,025

 
526

 
896

 
—

 
—

 
6,447

Property additions
 
1,074

 
507

 
1,014

 
83

 
—

 
2,678

 
 
 
 
 
 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,740

 
$
660

 
$
5,825

 
$
(114
)
 
$
(31
)
 
$
16,080

Internal revenues
 
—

 
—

 
1,237

 
—

 
(1,170
)
 
67

Total revenues
 
9,740

 
660

 
7,062

 
(114
)
 
(1,201
)
 
16,147

Depreciation, amortization and deferrals
 
846

 
110

 
415

 
24

 
—

 
1,395

Investment income
 
99

 
—

 
56

 
1

 
(42
)
 
114

Interest expense
 
(530
)
 
(89
)
 
(298
)
 
(91
)
 
—

 
(1,008
)
Income taxes
 
287

 
114

 
222

 
(87
)
 
38

 
574

Net income
 
488

 
194

 
377

 
(149
)
 
(41
)
 
869

Total assets
 
25,534

 
4,379

 
16,796

 
617

 
—

 
47,326

Total goodwill
 
5,025

 
526

 
890

 
—

 
—

 
6,441

Property additions
 
868

 
390

 
778

 
93

 
—

 
2,129

 
 
 
 
 
 
 
 
 
 
 
 
 
2010
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,422

 
$
398

 
$
3,575

 
$
28

 
$
(158
)
 
$
13,265

Internal revenues
 
139

 
—

 
2,301

 
—

 
(2,366
)
 
74

Total revenues
 
9,561

 
398

 
5,876

 
28

 
(2,524
)
 
13,339

Depreciation, amortization and deferrals
 
1,094

 
80

 
284

 
14

 
—

 
1,472

Investment income
 
35

 
—

 
51

 
(2
)
 
33

 
117

Interest expense
 
(395
)
 
(66
)
 
(232
)
 
(155
)
 
3

 
(845
)
Income taxes
 
307

 
50

 
128

 
(47
)
 
24

 
462

Net income
 
522

 
85

 
210

 
(79
)
 
(20
)
 
718

Total assets
 
20,340

 
2,884

 
11,320

 
987

 
—

 
35,531

Total goodwill
 
5,025

 
526

 
24

 
—

 
—

 
5,575

Property additions
 
490

 
255

 
976

 
59

 
—

 
1,780