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Segment Information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Segment Financial Information
Segment Financial Information
Three Months Ended
 
Regulated Distribution
 
Competitive Energy Services
 
Regulated Independent Transmission
 
Other/Corporate
 
Reconciling Adjustments
 
Consolidated
 
 
(In millions)
September 30, 2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
2,934

 
$
1,714

 
$
106

 
$
(39
)
 
$
(9
)
 
$
4,706

Internal revenues
 
1

 
315

 
—

 
—

 
(303
)
 
13

Total revenues
 
2,935

 
2,029

 
106

 
(39
)
 
(312
)
 
4,719

Depreciation and amortization
 
282

 
110

 
16

 
6

 
—

 
414

Investment income (loss), net
 
32

 
28

 
—

 
—

 
(12
)
 
48

Net interest charges
 
144

 
73

 
12

 
21

 
—

 
250

Income taxes
 
170

 
136

 
20

 
(23
)
 
8

 
311

Net income (loss)
 
288

 
232

 
34

 
(39
)
 
(6
)
 
509

Total assets
 
26,951

 
16,541

 
2,353

 
816

 
—

 
46,661

Total goodwill
 
5,551

 
897

 
—

 
—

 
—

 
6,448

Property additions

 
281

 
197

 
34

 
—

 
—

 
512

September 30, 2010
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
2,685

 
$
1,002

 
$
73

 
$
(22
)
 
$
(10
)
 
$
3,728

Internal revenues
 
60

 
599

 
—

 
—

 
(659
)
 
—

Total revenues
 
2,745

 
1,601

 
73

 
(22
)
 
(669
)
 
3,728

Depreciation and amortization
 
278

 
67

 
9

 
4

 
—

 
358

Investment income (loss), net
 
24

 
27

 
—

 
1

 
(6
)
 
46

Net interest charges
 
125

 
33

 
6

 
7

 
(4
)
 
167

Income taxes
 
124

 
(16
)
 
13

 
(9
)
 
7

 
119

Net income (loss)
 
202

 
(26
)
 
22

 
(14
)
 
(9
)
 
175

Total assets
 
21,763

 
11,078

 
1,011

 
856

 
—

 
34,708

Total goodwill
 
5,551

 
24

 
—

 
—

 
—

 
5,575

Property additions

 
191

 
264

 
18

 
(2
)
 
—

 
471

Nine Months Ended
 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
7,687

 
$
4,450

 
$
278

 
$
(92
)
 
$
(25
)
 
$
12,298

Internal revenues
 
1

 
976

 
—

 
—

 
(920
)
 
57

Total revenues
 
7,688

 
5,426

 
278

 
(92
)
 
(945
)
 
12,355

Depreciation and amortization
 
767

 
305

 
47

 
19

 
—

 
1,138

Investment income (loss), net
 
84

 
49

 
—

 
1

 
(34
)
 
100

Net interest charges
 
420

 
195

 
32

 
61

 
—

 
708

Income taxes
 
334

 
146

 
45

 
(73
)
 
38

 
490

Net income (loss)
 
568

 
249

 
78

 
(125
)
 
(45
)
 
725

Total assets
 
26,951

 
16,541

 
2,353

 
816

 
—

 
46,661

Total goodwill
 
5,551

 
897

 
—

 
—

 
—

 
6,448

Property additions

 
760

 
608

 
105

 
56

 
—

 
1,529

September 30, 2010
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
7,483

 
$
2,518

 
$
189

 
$
(65
)
 
$
(24
)
 
$
10,101

Internal revenues
 
79

 
1,812

 
—

 
—

 
(1,824
)
 
67

Total revenues
 
7,562

 
4,330

 
189

 
(65
)
 
(1,848
)
 
10,168

Depreciation and amortization
 
855

 
215

 
34

 
10

 
—

 
1,114

Investment income (loss), net
 
78

 
41

 
—

 
2

 
(28
)
 
93

Net interest charges
 
373

 
99

 
16

 
29

 
(11
)
 
506

Income taxes
 
267

 
101

 
27

 
(33
)
 
2

 
364

Net income (loss)
 
437

 
164

 
45

 
(53
)
 
(13
)
 
580

Total assets
 
21,763

 
11,078

 
1,011

 
856

 
—

 
34,708

Total goodwill
 
5,551

 
24

 
—

 
—

 
—

 
5,575

Property additions
 
499

 
883

 
47

 
38

 
—

 
1,467