SEGMENT OF BUSINESS INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	$ 739	$ 704	$ 2,027	$ 1,898
Intersegment Revenue	0	0	0	0
Operating Income	269	255	772	738
Regulated Operating Revenue, Gas	132	128	740	667
Regulated and Unregulated Operating Revenue	1,121	1,051	3,736	3,378
Income Available to Common Shareholders	144	131	433	368
Segment Assets	15,871		15,871		15,164
Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	739	704	2,027	1,898
Intersegment Revenue	1	2	5	6
Operating Income	275	257	616	588
Segment Assets	9,898		9,898		9,488
Gas Distribution
Segment Reporting Information [Line Items]
Intersegment Revenue	0	0	0	0
Operating Income	(6)	(6)	98	94
Regulated and Unregulated Operating Revenue	127	123	728	657
Segment Assets	2,365		2,365		2,340
Retail Gas Marketing
Segment Reporting Information [Line Items]
Intersegment Revenue	0	0	0	0
Regulated and Unregulated Operating Revenue	68	67	367	325
Income Available to Common Shareholders	(3)	(2)	16	16
Segment Assets	121		121		172
Energy Marketing [Member]
Segment Reporting Information [Line Items]
Intersegment Revenue	47	44	154	133
Regulated and Unregulated Operating Revenue	182	152	602	488
Income Available to Common Shareholders	(2)	1	5	5
Segment Assets	110		110		133
All Other [member]
Segment Reporting Information [Line Items]
Intersegment Revenue	103	95	317	303
Operating Income	7	8	21	22
Regulated and Unregulated Operating Revenue	9	11	27	30
Income Available to Common Shareholders	(5)	(3)	(3)	(2)
Segment Assets	1,333		1,333		1,378
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Intersegment Revenue	(151)	(141)	(476)	(442)
Operating Income	(7)	(4)	37	34
Regulated and Unregulated Operating Revenue	(4)	(6)	(15)	(20)
Income Available to Common Shareholders	154	135	415	349
Segment Assets	2,044		2,044		1,653
SCEG
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	740	706	2,032	1,903
Operating Income	272	255	656	625
Regulated Operating Revenue, Gas	72	70	337	297
Net Income (Loss) Attributable to Parent	154	136	374	311
Segment Assets	13,399		13,399		12,700
Regulated Operating Revenue	812	776	2,369	2,200
SCEG | Electric Operations
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	740	706	2,032	1,903
Operating Income	274	257	616	588
Segment Assets	9,898		9,898		9,488
SCEG | Gas Distribution
Segment Reporting Information [Line Items]
Operating Income	(2)	(2)	40	37
Regulated Operating Revenue, Gas	72	70	337	297
Segment Assets	709		709		686
SCEG | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Operating Income	0	0	0	0
Net Income (Loss) Attributable to Parent	154	136	374	311
Segment Assets	2,792		2,792		2,526
Regulated Operating Revenue	$ 0	$ 0	$ 0	$ 0