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SEGMENT OF BUSINESS INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
 
 
 
 
 
 
 
Electric Operations
 
$
786

 
$
1

 
$
126

 
n/a

Gas Distribution
 
123

 
—

 
(7
)
 
n/a

Gas Marketing
 
167

 
35

 
n/a

 
$
1

All Other
 
—

 
90

 
—

 
(7
)
Adjustments/Eliminations
 
—

 
(126
)
 
1

 
40

Consolidated Total
 
$
1,076

 
$
—

 
$
120

 
$
34

Nine Months Ended September 30, 2017
 
 
 
 
 
 
 
 
Electric Operations
 
$
2,042

 
$
4

 
$
549

 
n/a

Gas Distribution
 
584

 
1

 
109

 
n/a

Gas Marketing
 
623

 
93

 
n/a

 
$
17

All Other
 
—

 
286

 
—

 
(14
)
Adjustments/Eliminations
 
—

 
(384
)
 
27

 
323

Consolidated Total
 
$
3,249

 
$
—

 
$
685

 
$
326

Three Months Ended September 30, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
817

 
$
1

 
$
364

 
n/a

Gas Distribution
 
111

 
—

 
(14
)
 
n/a

Gas Marketing
 
165

 
35

 
n/a

 
$
(1
)
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

Gas Marketing
 
598

 
83

 
n/a

 
$
23

All Other
 
—

 
302

 
—

 
(14
)
Adjustments/Eliminations
 
—

 
(390
)
 
37

 
462

Consolidated Total
 
$
3,171

 
$
—

 
$
900

 
$
471


Consolidated SCE&G
 
 
 
 
 
 
Millions of dollars
 
External Revenue
 
Operating Income
 
Earnings Available to
Common Shareholder
Three Months Ended September 30, 2017
 
 
 
 
 
 
Electric Operations
 
$
787

 
$
125

 
n/a

Gas Distribution
 
69

 
(2
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
39

Consolidated Total
 
$
856

 
$
123

 
$
39

Nine Months Ended September 30, 2017
 
 
 
 
 
 
Electric Operations
 
$
2,046

 
$
549

 
n/a

Gas Distribution
 
285

 
42

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
270

Consolidated Total
 
$
2,331

 
$
591

 
$
270

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


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
September 30,
 
December 31,
 
September 30,
 
December 31,
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Electric Operations
 
$
12,294

 
$
11,929

 
$
12,294

 
$
11,929

Gas Distribution
 
3,080

 
2,892

 
856

 
825

Gas Marketing
 
187

 
230

 
n/a

 
n/a

All Other
 
970

 
1,124

 
n/a

 
n/a

Adjustments/Eliminations
 
3,488

 
2,532

 
4,283

 
3,337

Consolidated Total
 
$
20,019

 
$
18,707

 
$
17,433

 
$
16,091
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, 2017
 
 
 
 
 
 
Electric Operations
 
$
787

 
$
125

 
n/a

Gas Distribution
 
69

 
(2
)
 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
39

Consolidated Total
 
$
856

 
$
123

 
$
39

Nine Months Ended September 30, 2017
 
 
 
 
 
 
Electric Operations
 
$
2,046

 
$
549

 
n/a

Gas Distribution
 
285

 
42

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
270

Consolidated Total
 
$
2,331

 
$
591

 
$
270

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


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
September 30,
 
December 31,
 
September 30,
 
December 31,
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Electric Operations
 
$
12,294

 
$
11,929

 
$
12,294

 
$
11,929

Gas Distribution
 
3,080

 
2,892

 
856

 
825

Gas Marketing
 
187

 
230

 
n/a

 
n/a

All Other
 
970

 
1,124

 
n/a

 
n/a

Adjustments/Eliminations
 
3,488

 
2,532

 
4,283

 
3,337

Consolidated Total
 
$
20,019

 
$
18,707

 
$
17,433

 
$
16,091