COMMON EQUITY (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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			$ (156)	$ (148)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	$ 6	$ (1)	12	(2)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			(4)
Other Comprehensive Income (Loss), Net of Tax	6	(1)	8	$ (2)
Stock Issued During Period, Shares, New Issues				1.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	105	95	507	$ 287
Stock Issued During Period, Value, New Issues			14	51
Stock Repurchase Program, Authorized Amount	(1)		(1)
Treasury Stock, Value	$ (11)	$ (9)	$ (11)	$ (9)	$ (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	$ 2,340	$ 2,402	$ 2,340	$ 2,388	$ 2,289
Accumulated Other Comprehensive Income (Loss), Net of Tax	(67)	(62)	(67)	(62)	(75)	(60)
Retained Earnings, Unappropriated	3,027	2,585	3,027	2,585	2,684	2,444
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	2	(2)	(1)	(1)
Income Available to Common Shareholders	99	96	499	289
Common equity	5,351	4,854	5,351	4,854	4,987	4,664
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(51)	(54)	(51)	(54)	(63)	(52)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ (16)	$ (8)	$ (16)	$ (8)	$ (12)	$ (8)
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	$ 111	$ 99	$ 237	$ 225
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	55
Dividends			140	128
Net Income (Loss) Attributable to Noncontrolling Interest	$ 4	3	7	6
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			$ 237	225
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
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)		(3)		$ (3)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	5,050	4,641	5,050	4,641	4,757	$ 4,489
Retained Earnings, Unappropriated	2,170		$ 2,170		2,077
Reclassifcations of deferred employee benefit costs
Common equity	4,923		$ 4,923		4,634
SCEG excluding VIEs [Member]
Schedule of Capitalization, Equity [Line Items]
Common Stock, Value, Outstanding	2,756	2,534	2,756	2,534	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			137	(125)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	107	96	230	219
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	(3)	(3)	(3)	(3)	(3)
Retained Earnings, Unappropriated	2,170	1,990	2,170	1,990	2,077	1,896
Income Available to Common Shareholders			230	219
Noncontrolling Interest [Member]
COMMON EQUITY [Abstract]
Dividends			(3)	(3)
Net Income (Loss) Attributable to Noncontrolling Interest			7	6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	127	120	127	120	$ 123	$ 117
Interest Rate Contract
COMMON EQUITY [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	2	4	4
Commodity Contract
COMMON EQUITY [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	(1)	9	(5)
Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract
COMMON EQUITY [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	(2)	(4)	(4)
Gas Purchased for Resale [Member] [Member]
COMMON EQUITY [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			5
Gas Purchased for Resale [Member] [Member] | Cash Flow Hedging [Member] | Commodity Contract
COMMON EQUITY [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (2)	$ 1	$ 9	$ 5