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SEGMENT OF BUSINESS INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2016
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
The Company
 
 
 
 
 
 
 
 
Millions of dollars
 
External
Revenue
 
Intersegment Revenue
 
Operating
Income
 
Net
Income
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
625

 
$
2

 
$
222

 
n/a

Gas Distribution
 
127

 
—

 
(1
)
 
n/a

Retail Gas Marketing
 
76

 
—

 
n/a

 
$
(2
)
Energy Marketing
 
77

 
26

 
n/a

 
2

All Other
 
—

 
104

 
—

 
(7
)
Adjustments/Eliminations
 
—

 
(132
)
 
—

 
112

Consolidated Total
 
$
905

 
$
—

 
$
221

 
$
105

Six Months Ended June 30, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
1,217

 
$
3

 
$
420

 
n/a

Gas Distribution
 
426

 
1

 
93

 
n/a

Retail Gas Marketing
 
247

 
—

 
n/a

 
$
20

Energy Marketing
 
187

 
48

 
n/a

 
4

All Other
 
—

 
202

 
—

 
(7
)
Adjustments/Eliminations
 
—

 
(254
)
 
38

 
264

Consolidated Total
 
$
2,077

 
$
—

 
$
551

 
$
281

Three Months Ended June 30, 2015
 
 
 
 
 
 
 
 
Electric Operations
 
$
638

 
$
1

 
$
216

 
n/a

Gas Distribution
 
129

 
—

 
5

 
n/a

Retail Gas Marketing
 
71

 
—

 
n/a

 
$
(6
)
Energy Marketing
 
128

 
32

 
n/a

 
3

All Other
 
1

 
93

 
—

 
(10
)
Adjustments/Eliminations
 
—

 
(126
)
 
(5
)
 
112

Consolidated Total
 
$
967

 
$
—

 
$
216

 
$
99

Six Months Ended June 30, 2015
 
 
 
 
 
 
 
 
Electric Operations
 
$
1,266

 
$
3

 
$
415

 
n/a

Gas Distribution
 
497

 
—

 
101

 
n/a

Retail Gas Marketing
 
276

 
—

 
n/a

 
$
21

Energy Marketing
 
315

 
67

 
n/a

 
9

All Other
 
5

 
207

 
237

 
197

Adjustments/Eliminations
 
(3
)
 
(277
)
 
49

 
272

Consolidated Total
 
$
2,356

 
$
—

 
$
802

 
$
499

Consolidated SCE&G
 
 
 
 
 
 
Millions of dollars
 
External Revenue
 
Operating Income
 
Earnings Available to
Common Shareholder
Three Months Ended June 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
627

 
$
222

 
n/a

Gas Distributions
 
65

 
—

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
110

Consolidated Total
 
$
692

 
$
222

 
$
110

Six Months Ended June 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
1,220

 
$
420

 
n/a

Gas Distributions
 
189

 
38

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
223

Consolidated Total
 
$
1,409

 
$
458

 
$
223

Three Months Ended June 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
639

 
$
216

 
n/a

Gas Distributions
 
70

 
2

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
107

Consolidated Total
 
$
709

 
$
218

 
$
107

Six Months Ended June 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
1,269

 
$
415

 
n/a

Gas Distributions
 
212

 
40

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
230

Consolidated Total
 
$
1,481

 
$
455

 
$
230


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
June 30,
 
December 31,
 
June 30,
 
December 31,
Millions of dollars
 
2016
 
2015
 
2016
 
2015
Electric Operations
 
$
11,215

 
$
10,883

 
$
11,215

 
$
10,883

Gas Distribution
 
2,705

 
2,606

 
777

 
757

Retail Gas Marketing
 
112

 
106

 
n/a

 
n/a

Energy Marketing
 
85

 
95

 
n/a

 
n/a

All Other
 
1,022

 
998

 
n/a

 
n/a

Adjustments/Eliminations
 
2,533

 
2,458

 
3,271

 
3,125

Consolidated Total
 
$
17,672

 
$
17,146

 
$
15,263

 
$
14,765
SCEG  
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Consolidated SCE&G
 
 
 
 
 
 
Millions of dollars
 
External Revenue
 
Operating Income
 
Earnings Available to
Common Shareholder
Three Months Ended June 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
627

 
$
222

 
n/a

Gas Distributions
 
65

 
—

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
110

Consolidated Total
 
$
692

 
$
222

 
$
110

Six Months Ended June 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
1,220

 
$
420

 
n/a

Gas Distributions
 
189

 
38

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
223

Consolidated Total
 
$
1,409

 
$
458

 
$
223

Three Months Ended June 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
639

 
$
216

 
n/a

Gas Distributions
 
70

 
2

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
107

Consolidated Total
 
$
709

 
$
218

 
$
107

Six Months Ended June 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
1,269

 
$
415

 
n/a

Gas Distributions
 
212

 
40

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
230

Consolidated Total
 
$
1,481

 
$
455

 
$
230


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
June 30,
 
December 31,
 
June 30,
 
December 31,
Millions of dollars
 
2016
 
2015
 
2016
 
2015
Electric Operations
 
$
11,215

 
$
10,883

 
$
11,215

 
$
10,883

Gas Distribution
 
2,705

 
2,606

 
777

 
757

Retail Gas Marketing
 
112

 
106

 
n/a

 
n/a

Energy Marketing
 
85

 
95

 
n/a

 
n/a

All Other
 
1,022

 
998

 
n/a

 
n/a

Adjustments/Eliminations
 
2,533

 
2,458

 
3,271

 
3,125

Consolidated Total
 
$
17,672

 
$
17,146

 
$
15,263

 
$
14,765