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SEGMENT OF BUSINESS INFORMATION (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2017
 
 
 
 
 
 
 
 
Electric Operations
 
$
577

 
$
1

 
$
178

 
n/a

Gas Distribution
 
322

 
—

 
113

 
n/a

Gas Marketing
 
274

 
24

 
n/a

 
$
15

All Other
 
—

 
94

 
—

 
—

Adjustments/Eliminations
 
—

 
(119
)
 
25

 
156

Consolidated Total
 
$
1,173

 
$
—

 
$
316

 
$
171

Three Months Ended March 31, 2016
 
 
 
 
 
 
 
 
Electric Operations
 
$
592

 
$
1

 
$
198

 
n/a

Gas Distribution
 
299

 
1

 
94

 
n/a

Gas Marketing
 
281

 
22

 
n/a

 
$
24

All Other
 
—

 
98

 
—

 
—

Adjustments/Eliminations
 
—

 
(122
)
 
39

 
152

Consolidated Total
 
$
1,172

 
$
—

 
$
331

 
$
176

Consolidated SCE&G
 
 
 
 
 
 
Millions of dollars
 
External Revenue
 
Operating Income
 
Earnings Available to
Common Shareholder
Three Months Ended March 31, 2017
 
 
 
 
 
 
Electric Operations
 
$
578

 
$
178

 
n/a

Gas Distribution
 
141

 
44

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
109

Consolidated Total
 
$
719

 
$
222

 
$
109

Three Months Ended March 31, 2016
 
 
 
 
 
 
Electric Operations
 
$
593

 
$
198

 
n/a

Gas Distribution
 
124

 
38

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
113

Consolidated Total
 
$
717

 
$
236

 
$
113


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
March 31,
 
December 31,
 
March 31,
 
December 31,
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Electric Operations
 
$
12,076

 
$
11,929

 
$
12,076

 
$
11,929

Gas Distribution
 
2,926

 
2,892

 
836

 
825

Gas Marketing
 
202

 
230

 
n/a

 
n/a

All Other
 
997

 
1,124

 
n/a

 
n/a

Adjustments/Eliminations
 
2,257

 
2,532

 
3,053

 
3,337

Consolidated Total
 
$
18,458

 
$
18,707

 
$
15,965

 
$
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 March 31, 2017
 
 
 
 
 
 
Electric Operations
 
$
578

 
$
178

 
n/a

Gas Distribution
 
141

 
44

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
109

Consolidated Total
 
$
719

 
$
222

 
$
109

Three Months Ended March 31, 2016
 
 
 
 
 
 
Electric Operations
 
$
593

 
$
198

 
n/a

Gas Distribution
 
124

 
38

 
n/a

Adjustments/Eliminations
 
—

 
—

 
$
113

Consolidated Total
 
$
717

 
$
236

 
$
113


Segment Assets
 
The Company
 
Consolidated SCE&G
 
 
March 31,
 
December 31,
 
March 31,
 
December 31,
Millions of dollars
 
2017
 
2016
 
2017
 
2016
Electric Operations
 
$
12,076

 
$
11,929

 
$
12,076

 
$
11,929

Gas Distribution
 
2,926

 
2,892

 
836

 
825

Gas Marketing
 
202

 
230

 
n/a

 
n/a

All Other
 
997

 
1,124

 
n/a

 
n/a

Adjustments/Eliminations
 
2,257

 
2,532

 
3,053

 
3,337

Consolidated Total
 
$
18,458

 
$
18,707

 
$
15,965

 
$
16,091