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SEGMENT OF BUSINESS INFORMATION (Tables)
 9 Months Ended
Sep. 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 September 30, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
817

 
$
1

 
$
364

 
n/a

Gas Distribution
 
111

 
—

 
(14
)
 
n/a

Retail Gas Marketing
 
68

 
—

 
n/a

 
$
(3
)
Energy Marketing
 
97

 
35

 
n/a

 
2

All Other
 
—

 
100

 
—

 
(7
)
Adjustments/Eliminations
 
—

 
(136
)
 
(2
)
 
197

Consolidated Total
 
$
1,093

 
$
—

 
$
348

 
$
189

Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
2,035

 
$
4

 
$
784

 
n/a

Gas Distribution
 
538

 
1

 
79

 
n/a

Retail Gas Marketing
 
315

 
—

 
n/a

 
$
17

Energy Marketing
 
283

 
83

 
n/a

 
6

All Other
 
—

 
302

 
—

 
(14
)
Adjustments/Eliminations
 
—

 
(390
)
 
37

 
462

Consolidated Total
 
$
3,171

 
$
—

 
$
900

 
$
471

Three Months Ended September 30, 2015
 
 
 
 
 
 
 
 
Electric Operations
 
$
742

 
$
1

 
$
313

 
n/a

Gas Distribution
 
112

 
2

 
(13
)
 
n/a

Retail Gas Marketing
 
68

 
—

 
n/a

 
$
(3
)
Energy Marketing
 
146

 
34

 
n/a

 
(1
)
All Other
 
—

 
102

 
—

 
(9
)
Adjustments/Eliminations
 
—

 
(139
)
 
(8
)
 
162

Consolidated Total
 
$
1,068

 
$
—

 
$
292

 
$
149

Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
 
Electric Operations
 
$
2,008

 
$
4

 
$
728

 
n/a

Gas Distribution
 
609

 
2

 
88

 
n/a

Retail Gas Marketing
 
344

 
—

 
n/a

 
$
18

Energy Marketing
 
461

 
101

 
n/a

 
8

All Other
 
5

 
309

 
237

 
188

Adjustments/Eliminations
 
(4
)
 
(416
)
 
42

 
434

Consolidated Total
 
$
3,423

 
$
—

 
$
1,095

 
$
648

Consolidated SCE&G
 
 
 
 
 
 
Millions of dollars
 
External Revenue
 
Operating Income
 
Earnings Available to
Common Shareholder
Three Months Ended September 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
818

 
$
364

 
n/a

Gas Distribution
 
64

 
(5
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
201

Consolidated Total
 
$
882

 
$
359

 
$
201

Nine Months Ended September 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
2,039

 
$
784

 
n/a

Gas Distribution
 
253

 
32

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
423

Consolidated Total
 
$
2,292

 
$
816

 
$
423

Three Months Ended September 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
743

 
$
313

 
n/a

Gas Distribution
 
63

 
(6
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
164

Consolidated Total
 
$
806

 
$
307

 
$
164

Nine Months Ended September 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
2,013

 
$
728

 
n/a

Gas Distribution
 
275

 
35

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
394

Consolidated Total
 
$
2,288

 
$
763

 
$
394


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
September 30,
 
December 31,
 
September 30,
 
December 31,
Millions of dollars
 
2016
 
2015
 
2016
 
2015
Electric Operations
 
$
11,543

 
$
10,883

 
$
11,543

 
$
10,883

Gas Distribution
 
2,757

 
2,606

 
801

 
757

Retail Gas Marketing
 
140

 
106

 
n/a

 
n/a

Energy Marketing
 
58

 
95

 
n/a

 
n/a

All Other
 
985

 
998

 
n/a

 
n/a

Adjustments/Eliminations
 
2,963

 
2,458

 
3,634

 
3,125

Consolidated Total
 
$
18,446

 
$
17,146

 
$
15,978

 
$
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 September 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
818

 
$
364

 
n/a

Gas Distribution
 
64

 
(5
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
201

Consolidated Total
 
$
882

 
$
359

 
$
201

Nine Months Ended September 30, 2016
 
 
 
 
 
 
Electric Operations
 
$
2,039

 
$
784

 
n/a

Gas Distribution
 
253

 
32

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
423

Consolidated Total
 
$
2,292

 
$
816

 
$
423

Three Months Ended September 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
743

 
$
313

 
n/a

Gas Distribution
 
63

 
(6
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
164

Consolidated Total
 
$
806

 
$
307

 
$
164

Nine Months Ended September 30, 2015
 
 
 
 
 
 
Electric Operations
 
$
2,013

 
$
728

 
n/a

Gas Distribution
 
275

 
35

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
394

Consolidated Total
 
$
2,288

 
$
763

 
$
394


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
September 30,
 
December 31,
 
September 30,
 
December 31,
Millions of dollars
 
2016
 
2015
 
2016
 
2015
Electric Operations
 
$
11,543

 
$
10,883

 
$
11,543

 
$
10,883

Gas Distribution
 
2,757

 
2,606

 
801

 
757

Retail Gas Marketing
 
140

 
106

 
n/a

 
n/a

Energy Marketing
 
58

 
95

 
n/a

 
n/a

All Other
 
985

 
998

 
n/a

 
n/a

Adjustments/Eliminations
 
2,963

 
2,458

 
3,634

 
3,125

Consolidated Total
 
$
18,446

 
$
17,146

 
$
15,978

 
$
14,765