COMMON EQUITY (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items]
Common Stock, Value, Outstanding	$ 2,391		$ 2,391		$ 2,378
Common Stock, Shares Authorized	200.0		200.0		200.0
COMMON EQUITY [Abstract]
Dividends declared			$ (234)	$ (223)
Stock Issued During Period, Shares, New Issues				1.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 146	$ 145	653	$ 432
Proceeds from Issuance of Common Stock			14	75
Stock Issued During Period, Value, New Issues			13	76
Stock Repurchase Program, Authorized Amount	(1)	(1)	(1)	(1)
Treasury Stock, Value	$ (11)	$ (10)	$ (11)	$ (10)	$ (10)	$ (9)
Common Stock, Shares, Outstanding	142.9	142.0	142.9	142.0	142.7	141.0
Stockholders' Equity before Treasury Stock	$ 2,402	$ 2,365	$ 2,402	$ 2,365	$ 2,388	$ 2,289
Retained Earnings, Unappropriated	3,098	2,654	3,098	2,654	2,684	2,444
Accumulated Other Comprehensive Income (Loss), Net of Tax	(70)		(70)		(75)
AOCI before Tax, Attributable to Parent	55	54	55	54	63
Other Comprehensive Income (Loss), Net of Tax	(3)	1	5	(1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	1		(3)	(1)
Defined Benefit Plan, Accumulated Benefit Obligation	(15)	(7)	(15)	(7)
Defined Benefit Plan, Benefit Obligation	3	1	3	1	(12)	(8)
AOCI Tax, Attributable to Parent						52
Income Available to Common Shareholders	149	144	648	433
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(4)	0	8	(2)
Common equity	5,419	4,948	5,419	4,948	4,987	4,664
AOCI Attributable to Parent [Member]
COMMON EQUITY [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax	70	61	70	61
AOCI before Tax, Attributable to Parent	(11)	(3)	(11)	(3)	$ (75)
AOCI Tax, Attributable to Parent						$ (60)
Reclassification out of Accumulated Other Comprehensive Income [Member]
COMMON EQUITY [Abstract]
AOCI before Tax, Attributable to Parent	$ (16)	$ (2)	$ (16)	$ (2)
SCEG
Schedule of Capitalization, Equity [Line Items]
Common Stock, Shares, Issued	40.3	40.3	40.3	40.3	40.3	40.3
Common Stock, Value, Outstanding	$ 2,756		$ 2,756		$ 2,560
Common Stock, Shares Authorized	50.0		50.0
COMMON EQUITY [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 167	$ 157	$ 405	$ 383
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			0	0
Proceeds from Contribution from Parent, net of return of Proceeds			196	82
Dividends			(210)	(197)
Net Income (Loss) Attributable to Noncontrolling Interest	$ 3	3	11	9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			$ 405	383
Common Stock, Shares, Outstanding	40.3		40.3		40.3
Preferred Stock, Shares Authorized	20.0		20.0
Preferred Stock, Shares Outstanding	0.0		0.0
Preferred Stock, Value, Issued	$ 0		$ 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	5,148	4,757	5,148	4,757	$ 4,757	$ 4,489
Retained Earnings, Unappropriated	2,266		2,266		2,077
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)		$ (3)		(3)
Reclassifcations of deferred employee benefit costs			not significant
Common equity	5,019		$ 5,019		4,634
SCEG excluding VIEs [Member]
Schedule of Capitalization, Equity [Line Items]
Common Stock, Value, Outstanding	2,756	2,561	2,756	2,561	2,560	2,479
COMMON EQUITY [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			0	0
Dividends			(205)	(192)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	164	154	394	374
Retained Earnings, Unappropriated	2,266	2,078	2,266	2,078	2,077	1,896
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	(3)	(3)	(3)	(3)	(3)
Income Available to Common Shareholders			394	374
Noncontrolling Interest [Member]
COMMON EQUITY [Abstract]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(5)	(5)
Net Income (Loss) Attributable to Noncontrolling Interest			11	9
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	129	121	129	121	$ 123	$ 117
Interest Rate Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	(2)	(6)	(5)
Commodity Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1)	0	(10)	4
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Other Comprehensive Income (Loss) [Member]
COMMON EQUITY [Abstract]
AOCI before Tax, Attributable to Parent	8	3	8	3
Gain (Loss) on Derivative Instruments [Member] | Other Comprehensive Income Location [Domain]
COMMON EQUITY [Abstract]
AOCI before Tax, Attributable to Parent	(16)	(1)	(16)	(1)
Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	2	6	5
Gas Purchased for Resale [Member] [Member] | Cash Flow Hedging [Member] | Commodity Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 1	$ 0	$ 10	$ (4)