SEGMENT OF BUSINESS INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total	$ 17,146				$ 16,818				$ 17,146	$ 16,818	$ 15,127
Additions to Other Assets, Amount									1,153	1,092	1,106
Deferred Tax Assets, Gross	0				0				0	0	0
Electric Domestic Regulated Revenue									2,551	2,622	2,423
Regulated and Unregulated Operating Revenue	956	$ 1,068	$ 967	$ 1,389	1,214	$ 1,121	$ 1,026	$ 1,590	4,380	4,951	4,495
Intersegment Revenue									0	0	0
Operating Income	214	292	216	586	234	269	154	350	1,308	1,007	910
Interest Expense									318	312	297
Depreciation, Depletion and Amortization									358	384	378
Income Tax Expense (Benefit)									393	248	223
Income Available to Common Shareholders	98	149	99	400	105	144	96	193	746	538	471
Regulated Operating Revenue, Gas									811	1,028	955
Electric Operations
Segment Reporting Information [Line Items]
Total	10,883				10,182				10,883	10,182	9,488
Additions to Other Assets, Amount									1,087	936	907
Deferred Tax Assets, Gross	(5)				(11)				(5)	(11)	(10)
Intersegment Revenue									6	7	6
Operating Income									876	768	679
Interest Expense									17	19	19
Depreciation, Depletion and Amortization									277	300	297
Income Tax Expense (Benefit)									9	7	6
Gas Distribution
Segment Reporting Information [Line Items]
Total	2,606				2,487				2,606	2,487	2,340
Additions to Other Assets, Amount									203	200	140
Deferred Tax Assets, Gross	(29)				(29)				(29)	(29)	(27)
Regulated and Unregulated Operating Revenue									810	1,012	942
Intersegment Revenue									2	2	1
Operating Income									152	159	153
Interest Expense									23	22	22
Depreciation, Depletion and Amortization									77	72	70
Income Tax Expense (Benefit)									32	33	33
Retail Gas and Energy Marketing Segment [Member]
Segment Reporting Information [Line Items]
Total	95				150				95	150	133
Additions to Other Assets, Amount									2	2	1
Deferred Tax Assets, Gross	(6)				(9)				(6)	(9)	(2)
Regulated and Unregulated Operating Revenue									569	786	652
Intersegment Revenue									128	196	167
Income Tax Expense (Benefit)									6	3	4
Income Available to Common Shareholders									9	5	6
All Other [member]
Segment Reporting Information [Line Items]
Total	998				1,474				998	1,474	1,378
Additions to Other Assets, Amount									15	52	31
Deferred Tax Assets, Gross	0				(15)				0	(15)	(14)
Regulated and Unregulated Operating Revenue									5	37	40
Intersegment Revenue									413	437	416
Operating Income									236	27	27
Interest Expense									1	5	4
Depreciation, Depletion and Amortization									16	24	26
Income Tax Expense (Benefit)									1	12	14
Income Available to Common Shareholders									185	(6)	(2)
Retail Gas Marketing
Segment Reporting Information [Line Items]
Total	106				140				106	140	172
Additions to Other Assets, Amount									0	0	0
Deferred Tax Assets, Gross	(9)				(11)				(9)	(11)	(8)
Regulated and Unregulated Operating Revenue									449	515	465
Intersegment Revenue									0	0	0
Interest Expense									1	1	1
Depreciation, Depletion and Amortization									2	2	3
Income Tax Expense (Benefit)									12	16	15
Income Available to Common Shareholders									19	26	24
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total	2,458				2,385				2,458	2,385	1,616
Additions to Other Assets, Amount									(154)	(98)	27
Deferred Tax Assets, Gross	49				75				49	75	61
Regulated and Unregulated Operating Revenue									(4)	(21)	(27)
Intersegment Revenue									(549)	(642)	(590)
Operating Income									44	53	51
Interest Expense									276	265	251
Depreciation, Depletion and Amortization									(14)	(14)	(18)
Income Tax Expense (Benefit)									333	177	151
Income Available to Common Shareholders									533	513	443
SCE&G
Segment Reporting Information [Line Items]
Total	14,765				14,078				14,765	14,078	12,673
Additions to Other Assets, Amount									1,008	934	1,003
Deferred Tax Assets, Gross	0				0				0	0	0
Electric Domestic Regulated Revenue									2,557	2,629	2,431
Regulated Operating Revenue	643	806	709	772	722	812	698	859	2,930	3,091	2,845
Operating Income	172	$ 307	$ 218	$ 237	174	$ 272	$ 145	$ 239	934	830	737
Interest Expense									248	228	217
Depreciation, Depletion and Amortization									294	315	313
Income Tax Expense (Benefit)									231	218	189
Regulated Operating Revenue, Gas									373	462	414
SCE&G | Electric Operations
Segment Reporting Information [Line Items]
Total	10,883								10,883		9,488
Additions to Other Assets, Amount									1,087		907
Deferred Tax Assets, Gross	(5)								(5)		(10)
Operating Income									876		679
Interest Expense									17	19	19
Depreciation, Depletion and Amortization									277	300	294
SCE&G | Gas Distribution
Segment Reporting Information [Line Items]
Total	757				721				757	721	686
Additions to Other Assets, Amount									57	55	45
Regulated and Unregulated Operating Revenue									373	462	414
Operating Income									58	62	58
Interest Expense									0	0	0
Depreciation, Depletion and Amortization									28	27	26
SCE&G | Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total	3,125				3,175				3,125	3,175	2,499
Additions to Other Assets, Amount									(136)	(57)	51
Deferred Tax Assets, Gross	$ (5)				$ (11)				(5)	(11)	(10)
Operating Income											0
Interest Expense									231	209	198
Depreciation, Depletion and Amortization									(11)	(12)	(7)
External revenue [Member] | SCE&G
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue									$ 2,557	$ 2,629	$ 2,431