SEGMENT OF BUSINESS INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gain (Loss) on Disposition of Nonregulated Business, Net of Transaction Costs		$ 201
Electric Domestic Regulated Revenue	$ 742		$ 739	$ 2,008	$ 2,027
Intersegment Revenue	0		0	0	0
Operating Income	(292)		(269)	(1,095)	(772)
Regulated Operating Revenue, Gas	112		132	610	740
Regulated and Unregulated Operating Revenue	1,068		1,121	3,423	3,736
Income Available to Common Shareholders	149		144	648	433
Segment Assets	16,506			16,506		$ 16,852
Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	742		739	2,008	2,027
Intersegment Revenue	1		1	4	5
Operating Income	(313)		(275)	(728)	(616)
Segment Assets	10,531			10,531		10,182
Gas Distribution
Segment Reporting Information [Line Items]
Intersegment Revenue	2		0	2	0
Operating Income	13		6	(88)	(98)
Regulated and Unregulated Operating Revenue	112		127	609	728
Segment Assets	2,498			2,498		2,487
Retail Gas Marketing
Segment Reporting Information [Line Items]
Intersegment Revenue	0		0	0	0
Regulated and Unregulated Operating Revenue	68		68	344	367
Income Available to Common Shareholders	(3)		(3)	18	16
Segment Assets	107			107		140
Energy Marketing [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	34		47	101	154
Regulated and Unregulated Operating Revenue	146		182	461	602
Income Available to Common Shareholders	(1)		(2)	8	5
Segment Assets	102			102		150
All Other [member]
Segment Reporting Information [Line Items]
Intersegment Revenue	102		103	309	317
Operating Income	0		(7)	(237)	(21)
Regulated and Unregulated Operating Revenue	0		9	5	27
Income Available to Common Shareholders	(9)		(5)	188	(3)
Segment Assets	998			998		1,474
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Intersegment Revenue	(139)		(151)	(416)	(476)
Operating Income	(8)		7	(42)	(37)
Regulated and Unregulated Operating Revenue	0		(4)	(4)	(15)
Income Available to Common Shareholders	162		154	434	415
Segment Assets	2,270			2,270		2,419
SCEG
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	743		740	2,013	2,032
Operating Income	(307)		(272)	(763)	(656)
Regulated Operating Revenue, Gas	63		72	275	337
Net Income (Loss) Attributable to Parent	164		154	394	374
Segment Assets	14,312			14,312		14,107
Regulated Operating Revenue	806		812	2,288	2,369
SCEG | Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	743		740	2,013	2,032
Operating Income	(313)		(274)	(728)	(616)
Segment Assets	10,531			10,531		10,182
SCEG | Gas Distribution
Segment Reporting Information [Line Items]
Operating Income	6		2	(35)	(40)
Regulated Operating Revenue, Gas	63		72	275	337
Segment Assets	749			749		721
SCEG | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Operating Income	0		0	0	0
Net Income (Loss) Attributable to Parent	164		154	394	374
Segment Assets	3,032			3,032		$ 3,204
Regulated Operating Revenue	$ 0		$ 0	$ 0	$ 0