SEGMENT OF BUSINESS INFORMATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total	$ 16,852				$ 15,164				$ 16,852	$ 15,164	$ 14,616
Additions to Other Assets, Amount									1,092	1,106	1,077
Deferred Tax Assets, Gross	0				0				0	0	(11)
Electric Domestic Regulated Revenue									2,622	2,423	2,446
Regulated and Unregulated Operating Revenue	1,214	1,121	1,026	1,590	1,117	1,051	1,016	1,311	4,951	4,495	4,176
Intersegment Revenue									0	0	0
Operating Income	234	269	154	350	173	255	189	293	1,007	910	859
Interest Expense									312	297	295
Depreciation, Depletion and Amortization									384	378	356
Income Tax Expense (Benefit)									248	223	182
Income Available to Common Shareholders	105	144	96	193	104	131	85	151	538	471	420
Regulated Operating Revenue, Gas									1,028	955	774
Electric Operations
Segment Reporting Information [Line Items]
Total	10,182				9,488				10,182	9,488	8,989
Additions to Other Assets, Amount									936	907	999
Deferred Tax Assets, Gross	(11)				(10)				(11)	(10)	(9)
Intersegment Revenue									7	6	7
Operating Income									768	679	668
Interest Expense									19	19	21
Depreciation, Depletion and Amortization									300	297	278
Income Tax Expense (Benefit)									7	6	7
Gas Distribution
Segment Reporting Information [Line Items]
Total	2,487				2,340				2,487	2,340	2,292
Additions to Other Assets, Amount									200	140	123
Deferred Tax Assets, Gross	(29)				(27)				(29)	(27)	(26)
Regulated and Unregulated Operating Revenue									1,012	942	764
Intersegment Revenue									2	1	1
Operating Income									159	153	141
Interest Expense									22	22	23
Depreciation, Depletion and Amortization									72	70	67
Income Tax Expense (Benefit)									33	33	32
Retail Gas and Energy Marketing Segment [Member]
Segment Reporting Information [Line Items]
Total	150				133				150	133	122
Additions to Other Assets, Amount									2	1	1
Deferred Tax Assets, Gross	(9)				(2)				(9)	(2)	(4)
Regulated and Unregulated Operating Revenue									786	652	543
Intersegment Revenue									196	167	125
Income Tax Expense (Benefit)									3	4	3
Income Available to Common Shareholders									5	6	5
All Other [member]
Segment Reporting Information [Line Items]
Total	1,474				1,378				1,474	1,378	1,415
Additions to Other Assets, Amount									52	31	14
Deferred Tax Assets, Gross	(15)				(14)				(15)	(14)	(17)
Regulated and Unregulated Operating Revenue									37	40	45
Intersegment Revenue									437	416	416
Operating Income									27	27	22
Interest Expense									5	4	3
Depreciation, Depletion and Amortization									24	26	25
Income Tax Expense (Benefit)									12	14	15
Income Available to Common Shareholders									(6)	(2)	1
Retail Gas Marketing
Segment Reporting Information [Line Items]
Total	140				172				140	172	153
Additions to Other Assets, Amount									0	0	0
Deferred Tax Assets, Gross	(11)				(8)				(11)	(8)	(10)
Regulated and Unregulated Operating Revenue									515	465	413
Intersegment Revenue									0	0	0
Interest Expense									1	1	1
Depreciation, Depletion and Amortization									2	3	3
Income Tax Expense (Benefit)									16	15	7
Income Available to Common Shareholders									26	24	11
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total	2,419				1,653				2,419	1,653	1,645
Additions to Other Assets, Amount									(98)	27	(60)
Deferred Tax Assets, Gross	75				61				75	61	55
Regulated and Unregulated Operating Revenue									(21)	(27)	(35)
Intersegment Revenue									(642)	(590)	(549)
Operating Income									53	51	28
Interest Expense									265	251	247
Depreciation, Depletion and Amortization									(14)	(18)	(17)
Income Tax Expense (Benefit)									177	151	118
Income Available to Common Shareholders									513	443	403
SCE&G
Segment Reporting Information [Line Items]
Total	14,107				12,700				14,107	12,700	12,104
Additions to Other Assets, Amount									934	1,003	978
Deferred Tax Assets, Gross	0				0				0	0	0
Electric Domestic Regulated Revenue									2,629	2,431	2,453
Regulated Operating Revenue	722	812	698	859	645	776	696	728	3,091	2,845	2,809
Operating Income	174	272	145	239	111	255	180	191	830	737	717
Interest Expense									228	217	211
Depreciation, Depletion and Amortization									315	313	293
Income Tax Expense (Benefit)									218	189	157
Regulated Operating Revenue, Gas									462	414	356
SCE&G | Electric Operations
Segment Reporting Information [Line Items]
Total	10,182								10,182		8,989
Additions to Other Assets, Amount									936		999
Deferred Tax Assets, Gross	(11)								(11)		(9)
Operating Income									768		668
Interest Expense									19	19	21
Depreciation, Depletion and Amortization									300	294	278
SCE&G | Gas Distribution
Segment Reporting Information [Line Items]
Total	721				686				721	686	659
Additions to Other Assets, Amount									55	45	56
Regulated and Unregulated Operating Revenue									462	414	356
Operating Income									62	58	49
Interest Expense									0	0	0
Depreciation, Depletion and Amortization									27	26	25
SCE&G | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total	3,204				2,526				3,204	2,526	2,456
Additions to Other Assets, Amount									(57)	51	(77)
Deferred Tax Assets, Gross	(11)				(10)				(11)	(10)	(9)
Operating Income											0
Interest Expense									209	198	190
Depreciation, Depletion and Amortization									$ (12)	$ (7)	$ (10)