CONSOLIDATED STATEMENTS OF COMMON EQUITY (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax			$ (3)	$ 4	$ (2)
Shares, Outstanding	143	141	143	141	132	130
Stock Issued During Period, Shares, New Issues			2	9	2
Common stock issued			98	297	97
Dividends, Common Stock			(298)	(284)	(260)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(63)	(52)	(63)	(52)	(70)	(81)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(12)	(8)	(12)	(8)	(16)	(13)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(75)	(60)	(75)	(60)	(86)	(94)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax			(11)	18	11
Other Comprehensive Income (Loss), Net of Tax			(15)	26	8
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax			(14)	7	(8)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax			(5)	7	(4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			3	11	19
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Reclassified During Period, Net of Tax			1.0	1.0	1.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			523	497	428
Retained Earnings, Unappropriated	2,684	2,444	2,684	2,444	2,257	2,097
Common Stock, Value, Outstanding	2,378	2,280	2,378	2,280	1,983	1,886
Income Available to Common Shareholders	105	104	538	471	420
Dividends Declared Per Share of Common Stock (in dollars per share)			$ 2.10	$ 2.03	$ 1.98
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax			0	0	0
Genco
Stockholders' Equity Attributable to Noncontrolling Interest	123	117	123	117	114	108
Net Income (Loss) Attributable to Noncontrolling Interest			12	11	11
Contributions from parent			(1)	1
Dividends			7	7	7
SCE&G
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	(3)	(3)	(3)
Stockholders' Equity Attributable to Noncontrolling Interest	123	117	123	117
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,757	4,489	4,757	4,489	4,043	3,773
Net Income (Loss) Attributable to Noncontrolling Interest			12	11	11
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	76	72	458	391	352
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			0	1	(1)
Contributions from parent			82	311	128
Dividends			(272)	(257)	(209)
Other Comprehensive Income (Loss), Net of Tax			0	1	(1)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Reclassified During Period, Net of Tax			0	1.0	(1.0)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			458	392	351
Retained Earnings, Unappropriated	2,077	1,896	2,077	1,896
Common Stock, Value, Outstanding	2,560	2,479	2,560	2,479
SCEG excluding VIEs [Member]
Shares, Outstanding	40	40	40	40	40	40
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	(3)	(3)	(3)	(4)	(3)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			0	1	(1)
Contributions from parent			81	312	126
Dividends			265	250	202
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			446	381	340
Retained Earnings, Unappropriated		1,896		1,896	1,766	1,627
Common Stock, Value, Outstanding		2,479		2,479	2,167	2,041
Income Available to Common Shareholders			$ 446	$ 380	$ 341