SEGMENT OF BUSINESS INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gain (Loss) on Disposition of Nonregulated Business, Net of Transaction Costs		$ 202
Electric Domestic Regulated Revenue	$ 638		$ 610	$ 1,266	$ 1,289
Intersegment Revenue	0		0	0	0
Operating Income	216		154	802	504
Regulated Operating Revenue, Gas	130		150	499	608
Regulated and Unregulated Operating Revenue	967		1,026	2,356	2,616
Income Available to Common Shareholders	99		96	499	289
Segment Assets	16,368			16,368		$ 16,852
Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	638		610	1,266	1,289
Intersegment Revenue	1		2	3	4
Operating Income	216		143	415	341
Segment Assets	10,454			10,454		10,182
Gas Distribution
Segment Reporting Information [Line Items]
Intersegment Revenue	0		0	0	0
Operating Income	5		7	101	104
Regulated and Unregulated Operating Revenue	129		146	497	601
Segment Assets	2,481			2,481		2,487
Retail Gas Marketing
Segment Reporting Information [Line Items]
Intersegment Revenue	0		0	0	0
Regulated and Unregulated Operating Revenue	71		79	276	299
Income Available to Common Shareholders	(6)		(3)	21	19
Segment Assets	114			114		140
Energy Marketing [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	32		54	67	107
Regulated and Unregulated Operating Revenue	128		187	315	420
Income Available to Common Shareholders	3		0	9	7
Segment Assets	106			106		150
All Other [member]
Segment Reporting Information [Line Items]
Intersegment Revenue	93		104	207	214
Operating Income	0		6	237	14
Regulated and Unregulated Operating Revenue	1		9	5	18
Income Available to Common Shareholders	(10)		(2)	197	2
Segment Assets	989			989		1,474
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Intersegment Revenue	(126)		(160)	(277)	(325)
Operating Income	(5)		(2)	49	45
Regulated and Unregulated Operating Revenue	0		(5)	(3)	(11)
Income Available to Common Shareholders	112		101	272	261
Segment Assets	2,224			2,224		2,419
SCEG
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	639		612	1,269	1,292
Operating Income	218		145	455	383
Regulated Operating Revenue, Gas	70		86	212	265
Net Income (Loss) Attributable to Parent	107		96	230	219
Segment Assets	14,156			14,156		14,107
Regulated Operating Revenue	709		698	1,481	1,557
SCEG | Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	639		612	1,269	1,292
Operating Income	216		143	415	341
Segment Assets	10,454			10,454		10,182
SCEG | Gas Distribution
Segment Reporting Information [Line Items]
Operating Income	2		2	40	42
Regulated Operating Revenue, Gas	70		86	212	265
Segment Assets	741			741		721
SCEG | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Operating Income	0		0	0	0
Net Income (Loss) Attributable to Parent	107		96	230	219
Segment Assets	2,961			2,961		$ 3,204
Regulated Operating Revenue	$ 0		$ 0	$ 0	$ 0