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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2011
Segment Reporting [Abstract]  
Segment Financial Information
Segment Financial Information
For the Years Ended December 31,
 
Regulated Distribution
 
Competitive Energy Services
 
Regulated Independent Transmission
 
Other
 
Reconciling Adjustments
 
Consolidated
 
 
 
 
(In millions)
2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
10,004

 
$
5,936

 
$
391

 
$
(114
)
 
$
(26
)
 
$
16,191

Internal revenues
 
—

 
1,237

 
—

 
—

 
(1,170
)
 
67

Total Revenues
 
10,004

 
7,173

 
391

 
(114
)
 
(1,196
)
 
16,258

Depreciation and amortization
 
943

 
415

 
66

 
26

 
—

 
1,450

Investment income
 
110

 
56

 
—

 
1

 
(53
)
 
114

Net interest charges
 
(573
)
 
(298
)
 
(46
)
 
(91
)
 
—

 
(1,008
)
Income taxes
 
335

 
222

 
66

 
(87
)
 
38

 
574

Net income
 
570

 
377

 
112

 
(149
)
 
(41
)
 
869

Total assets
 
27,477

 
16,796

 
2,436

 
617

 
—

 
47,326

Total goodwill
 
5,551

 
890

 
—

 
—

 
—

 
6,441

Property additions
 
1,066

 
927

 
192

 
93

 
—

 
2,278

 
 
 
 
 
 
 
 
 
 
 
 
 
2010
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
9,571

 
$
3,575

 
$
242

 
$
(88
)
 
$
(35
)
 
$
13,265

Internal revenues
 
139

 
2,301

 
—

 
—

 
(2,366
)
 
74

Total Revenues
 
9,710

 
5,876

 
242

 
(88
)
 
(2,401
)
 
13,339

Depreciation and amortization
 
1,145

 
284

 
47

 
14

 
—

 
1,490

Investment income
 
102

 
51

 
—

 
(2
)
 
(34
)
 
117

Net interest charges
 
(500
)
 
(232
)
 
(22
)
 
(104
)
 
13

 
(845
)
Income taxes
 
338

 
128

 
32

 
(44
)
 
8

 
462

Net income
 
553

 
210

 
54

 
(79
)
 
(20
)
 
718

Total assets
 
22,160

 
11,320

 
1,064

 
987

 
—

 
35,531

Total goodwill
 
5,551

 
24

 
—

 
—

 
—

 
5,575

Property additions
 
681

 
1,159

 
64

 
59

 
—

 
1,963

 
 
 
 
 
 
 
 
 
 
 
 
 
2009
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
10,916

 
$
1,928

 
$
223

 
$
(82
)
 
$
(29
)
 
$
12,956

Internal revenues
 
—

 
2,843

 
—

 
—

 
(2,826
)
 
17

Total Revenues
 
10,916

 
4,771

 
223

 
(82
)
 
(2,855
)
 
12,973

Depreciation and amortization
 
1,432

 
279

 
50

 
15

 
—

 
1,776

Investment income
 
141

 
121

 
—

 
4

 
(62
)
 
204

Net interest charges
 
(478
)
 
(174
)
 
(19
)
 
(345
)
 
38

 
(978
)
Income taxes
 
243

 
305

 
26

 
(140
)
 
(250
)
 
184

Net income
 
335

 
446

 
39

 
(209
)
 
245

 
856

Total assets
 
22,663

 
10,668

 
974

 
749

 
—

 
35,054

Total goodwill
 
5,551

 
24

 
—

 
—

 
—

 
5,575

Property additions
 
718

 
1,412

 
32

 
41

 
—

 
2,203