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SEGMENT OF BUSINESS INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2014
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Millions of dollars
 
External
Revenue
 
Intersegment Revenue
 
Operating
Income
 
Net
Income
Three Months Ended September 30, 2014
 
 
 
 
 
 
 
 
Electric Operations
 
$
739

 
$
1

 
$
275

 
n/a

Gas Distribution
 
127

 
—

 
(6
)
 
n/a

Retail Gas Marketing
 
68

 
—

 
n/a

 
$
(3
)
Energy Marketing
 
182

 
47

 
n/a

 
(2
)
All Other
 
9

 
103

 
7

 
(5
)
Adjustments/Eliminations
 
(4
)
 
(151
)
 
(7
)
 
154

Consolidated Total
 
$
1,121

 
$
—

 
$
269

 
$
144

Nine Months Ended September 30, 2014
 
 
 
 
 
 
 
 
Electric Operations
 
$
2,027

 
$
5

 
$
616

 
n/a

Gas Distribution
 
728

 
—

 
98

 
n/a

Retail Gas Marketing
 
367

 
—

 
n/a

 
$
16

Energy Marketing
 
602

 
154

 
n/a

 
5

All Other
 
27

 
317

 
21

 
(3
)
Adjustments/Eliminations
 
(15
)
 
(476
)
 
37

 
415

Consolidated Total
 
$
3,736

 
$
—

 
$
772

 
$
433

Three Months Ended September 30, 2013
 
 
 
 
 
 
 
 
Electric Operations
 
$
704

 
$
2

 
$
257

 
n/a

Gas Distribution
 
123

 
—

 
(6
)
 
n/a

Retail Gas Marketing
 
67

 
—

 
n/a

 
$
(2
)
Energy Marketing
 
152

 
44

 
n/a

 
1

All Other
 
11

 
95

 
8

 
(3
)
Adjustments/Eliminations
 
(6
)
 
(141
)
 
(4
)
 
135

Consolidated Total
 
$
1,051

 
$
—

 
$
255

 
$
131

Nine Months Ended September 30, 2013
 
 
 
 
 
 
 
 
Electric Operations
 
$
1,898

 
$
6

 
$
588

 
n/a

Gas Distribution
 
657

 
—

 
94

 
n/a

Retail Gas Marketing
 
325

 
—

 
n/a

 
$
16

Energy Marketing
 
488

 
133

 
n/a

 
5

All Other
 
30

 
303

 
22

 
(2
)
Adjustments/Eliminations
 
(20
)
 
(442
)
 
34

 
349

Consolidated Total
 
$
3,378

 
$
—

 
$
738

 
$
368

 
 
September 30,
 
December 31,
 
Segment Assets
 
2014
 
2013
 
Electric Operations
 
$
9,898

 
$
9,488

 
Gas Distribution
 
2,365

 
2,340

 
Retail Gas Marketing
 
121

 
172

 
Energy Marketing
 
110

 
133

 
All Other
 
1,333

 
1,378

 
Adjustments/Eliminations
 
2,044

 
1,653

 
Consolidated Total
 
$
15,871

 
$
15,164

 
SCEG
  
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
.

 
 
External
 
Operating
 
Earnings Available to
Millions of dollars
 
Revenue
 
Income
 
Common Shareholder
Three Months Ended September 30, 2014
 
 
 
 
 
 
Electric Operations
 
$
740

 
$
274

 
n/a

Gas Distribution
 
72

 
(2
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
154

Consolidated Total
 
$
812

 
$
272

 
$
154

Nine Months Ended September 30, 2014
 
 
 
 
 
 
Electric Operations
 
$
2,032

 
$
616

 
n/a

Gas Distribution
 
337

 
40

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
374

Consolidated Total
 
$
2,369

 
$
656

 
$
374

Three Months Ended September 30, 2013
 
 
 
 
 
 
Electric Operations
 
$
706

 
$
257

 
n/a

Gas Distribution
 
70

 
(2
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
136

Consolidated Total
 
$
776

 
$
255

 
$
136

Nine Months Ended September 30, 2013
 
 
 
 
 
 
Electric Operations
 
$
1,903

 
$
588

 
n/a

Gas Distribution
 
297

 
37

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
311

Consolidated Total
 
$
2,200

 
$
625

 
$
311


 
 
September 30,
 
December 31,
 
 
Segment Assets
 
2014
 
2013
 
 
Electric Operations
 
$
9,898

 
$
9,488

 
 
Gas Distribution
 
709

 
686

 
 
Adjustments/Eliminations
 
2,792

 
2,526

 
 
Consolidated Total
 
$
13,399

 
$
12,700