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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Segment Financial Information
Segment Financial Information
Three Months Ended
 
Regulated Distribution
 
Regulated Transmission
 
Competitive Energy Services
 
Other/Corporate
 
Reconciling Adjustments
 
Consolidated
 
 
(In millions)
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
2,438

 
$
187

 
$
1,719

 
$
(30
)
 
$
(3
)
 
$
4,311

Internal revenues
 
—

 
—

 
210

 
—

 
(210
)
 
—

Total revenues
 
2,438

 
187

 
1,929

 
(30
)
 
(213
)
 
4,311

Depreciation and amortization
 
202

 
28

 
105

 
8

 
—

 
343

Investment income
 
20

 
—

 
36

 
(1
)
 
(16
)
 
39

Net interest charges
 
132

 
22

 
62

 
(4
)
 
—

 
212

Income taxes
 
168

 
35

 
76

 
(9
)
 
39

 
309

Net income*
 
286

 
59

 
129

 
(11
)
 
(38
)
 
425

Total assets
 
26,122

 
4,519

 
16,846

 
1,251

 
—

 
48,738

Total goodwill
 
5,025

 
526

 
893

 
—

 
—

 
6,444

Property additions
 
308

 
47

 
412

 
8

 
—

 
775

 
 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
2,864

 
$
181

 
$
1,714

 
$
(40
)
 
$
(12
)
 
$
4,707

Internal revenues
 
1

 
—

 
315

 
—

 
(304
)
 
12

Total revenues
 
2,865

 
181

 
2,029

 
(40
)
 
(316
)
 
4,719

Depreciation and amortization
 
273

 
31

 
110

 
5

 
—

 
419

Investment income
 
28

 
—

 
28

 
—

 
(8
)
 
48

Net interest charges
 
133

 
23

 
73

 
21

 
—

 
250

Income taxes
 
164

 
32

 
142

 
(23
)
 
10

 
325

Net income
 
280

 
56

 
242

 
(40
)
 
(8
)
 
530

Total assets
 
26,802

 
4,246

 
16,809

 
816

 
—

 
48,673

Total goodwill
 
5,025

 
526

 
877

 
—

 
—

 
6,428

Property additions
 
234

 
80

 
186

 
—

 
—

 
500

 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended
 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
6,857

 
$
557

 
$
4,942

 
$
(78
)
 
$
(22
)
 
$
12,256

Internal revenues
 
—

 
—

 
686

 
—

 
(684
)
 
2

Total revenues
 
6,857

 
557

 
5,628

 
(78
)
 
(706
)
 
12,258

Depreciation and amortization
 
636

 
89

 
307

 
25

 
—

 
1,057

Investment income
 
62

 
1

 
48

 
(1
)
 
(47
)
 
63

Net interest charges
 
396

 
68

 
175

 
57

 
—

 
696

Income taxes
 
355

 
101

 
173

 
(49
)
 
78

 
658

Net income*
 
603

 
171

 
295

 
(82
)
 
(68
)
 
919

Total assets
 
26,122

 
4,519

 
16,846

 
1,251

 
—

 
48,738

Total goodwill
 
5,025

 
526

 
893

 
—

 
—

 
6,444

Property additions
 
751

 
169

 
715

 
51

 
—

 
1,686

 
 
 
 
 
 
 
 
 
 
 
 
 
September 30, 2011
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
7,496

 
$
476

 
$
4,450

 
$
(93
)
 
$
(30
)
 
$
12,299

Internal revenues
 
1

 
—

 
976

 
—

 
(921
)
 
56

Total revenues
 
7,497

 
476

 
5,426

 
(93
)
 
(951
)
 
12,355

Depreciation and amortization
 
746

 
81

 
307

 
19

 
—

 
1,153

Investment income
 
76

 
—

 
49

 
1

 
(26
)
 
100

Net interest charges
 
389

 
64

 
195

 
60

 
—

 
708

Income taxes
 
322

 
79

 
163

 
(53
)
 
39

 
550

Net income
 
547

 
136

 
278

 
(145
)
 
(46
)
 
770

Total assets
 
26,802

 
4,246

 
16,809

 
816

 
—

 
48,673

Total goodwill
 
5,025

 
526

 
877

 
—

 
—

 
6,428

Property additions
 
615

 
250

 
543

 
56

 
—

 
1,464