SEGMENT OF BUSINESS INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gain (Loss) On Disposition Of Regulated Business Net Of Transaction Costs	$ 0	$ 0	$ 0	$ 235
Gain (Loss) on Disposition of Nonregulated Business, Net of Transaction Costs				202
Electric Domestic Regulated Revenue	817	742	2,035	2,008
Revenues	0	0	0	0
Net Income (Loss) Available to Common Stockholders, Basic	189	149	471	648
Operating Income	(348)	(292)	(900)	(1,095)
Regulated Operating Revenue, Gas	111	112	538	610
Regulated and Unregulated Operating Revenue	1,093	1,068	3,171	3,423
Segment Assets	18,446		18,446		$ 17,146
Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	817	742	2,035	2,008
Revenues	1	1	4	4
Operating Income	(364)	(313)	(784)	(728)
Segment Assets	11,543		11,543		10,883
Gas Distribution
Segment Reporting Information [Line Items]
Revenues	0	2	1	2
Operating Income	14	13	(79)	(88)
Regulated and Unregulated Operating Revenue	111	112	538	609
Segment Assets	2,757		2,757		2,606
Retail Gas Marketing
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Net Income (Loss) Available to Common Stockholders, Basic	(3)	(3)	17	18
Regulated and Unregulated Operating Revenue	68	68	315	344
Segment Assets	140		140		106
Energy Marketing [Member]
Segment Reporting Information [Line Items]
Revenues	35	34	83	101
Net Income (Loss) Available to Common Stockholders, Basic	2	(1)	6	8
Regulated and Unregulated Operating Revenue	97	146	283	461
Segment Assets	58		58		95
All Other [member]
Segment Reporting Information [Line Items]
Revenues	100	102	302	309
Net Income (Loss) Available to Common Stockholders, Basic	(7)	(9)	(14)	188
Operating Income	0	0	0	(237)
Regulated and Unregulated Operating Revenue	0	0	0	5
Segment Assets	985		985		998
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Revenues	(136)	(139)	(390)	(416)
Net Income (Loss) Available to Common Stockholders, Basic	197	162	462	434
Operating Income	(2)	8	37	(42)
Regulated and Unregulated Operating Revenue	0	0	0	(4)
Segment Assets	2,963		2,963		2,458
SCEG
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	818	743	2,039	2,013
Operating Income	(359)	(307)	(816)	(763)
Regulated Operating Revenue, Gas	64	63	253	275
Net Income (Loss) Attributable to Parent	201	164	423	394
Segment Assets	15,978		15,978		14,765
Regulated Operating Revenue	882	806	2,292	2,288
SCEG | Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	818	743	2,039	2,013
Operating Income	(364)	(313)	(784)	(728)
Segment Assets	11,543		11,543		10,883
SCEG | Gas Distribution
Segment Reporting Information [Line Items]
Operating Income	5	6	(32)	(35)
Regulated and Unregulated Operating Revenue	64	63	253	275
Segment Assets	801		801		757
SCEG | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Operating Income	0	0	0	0
Regulated and Unregulated Operating Revenue	0	0	0	0
Net Income (Loss) Attributable to Parent	201	$ 164	423	$ 394
Segment Assets	$ 3,634		$ 3,634		$ 3,125