CONSOLIDATED STATEMENTS OF COMMON EQUITY - USD ($) shares in Millions, $ in Millions	Total	AOCI Attributable to Parent [Member]	SCE&G	SCEG excluding VIEs [Member]	SCEG and GENCO [Member]
Common Stock, Value, Outstanding				$ 2,479
Stockholders' Equity Attributable to Noncontrolling Interest					$ 117
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 4,489
Stockholders' Equity Attributable to Parent at Dec. 31, 2013	$ 4,664
Shares, Outstanding at Dec. 31, 2013	141			40
Stockholders' Equity before Treasury Stock at Dec. 31, 2013	$ 2,289
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax at Dec. 31, 2013	(52)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax at Dec. 31, 2013	(8)
Retained Earnings, Unappropriated at Dec. 31, 2013	2,444			$ 1,896
Treasury Stock, Value at Dec. 31, 2013	(9)
Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2013	$ (60)			(3)
Stock Issued During Period, Shares, New Issues	2
Stock Issued During Period, Value, Other	$ 99
Stock Repurchased During Period, Value	1
Common stock issued	98
Dividends, Common Stock	(298)		(272)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(11)
Net Income (Loss) Attributable to Noncontrolling Interest			12		12
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			458
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			0	0
Contributions from parent			89		1
Dividends			(272)	(265)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(7)
Other Comprehensive Income (Loss), Net of Tax	(15)		0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(14)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	(5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	3
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Reclassified During Period, Net of Tax	1		0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	523		458	446
Proceeds from Contribution from Parent, net of return of Proceeds			82	81
Income Available to Common Shareholders	$ 538			$ 446
Dividends Declared Per Share of Common Stock (in dollars per share)	$ 2.10
Shares, Outstanding at Dec. 31, 2014	143			40
Stockholders' Equity before Treasury Stock at Dec. 31, 2014	$ 2,388
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax at Dec. 31, 2014	(63)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax at Dec. 31, 2014	(12)
Retained Earnings, Unappropriated at Dec. 31, 2014	2,684			$ 2,077
Treasury Stock, Value at Dec. 31, 2014	(10)
Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2014	(75)			(3)
Stockholders' Equity Attributable to Parent at Dec. 31, 2014	4,987
Common Stock, Value, Outstanding				2,560
Stockholders' Equity Attributable to Noncontrolling Interest					123
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			4,757
AOCI before Tax, Attributable to Parent	$ (4)	$ (19)
Stock Issued During Period, Shares, New Issues	0
Stock Issued During Period, Value, Other	$ 14
Stock Repurchased During Period, Value	2
Common stock issued	12
Dividends, Common Stock	(312)		(285)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	10
Net Income (Loss) Attributable to Noncontrolling Interest			14		14
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			480
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			0	0
Contributions from parent			204		0
Dividends			(286)	(278)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(8)
Other Comprehensive Income (Loss), Net of Tax	10		0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(12)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	22
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Reclassified During Period, Net of Tax	0		0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	756		480	466
Proceeds from Contribution from Parent, net of return of Proceeds			200	200
Income Available to Common Shareholders	$ 746			$ 466
Dividends Declared Per Share of Common Stock (in dollars per share)	$ 2.18
Shares, Outstanding at Dec. 31, 2015	143			40
Stockholders' Equity before Treasury Stock at Dec. 31, 2015	$ 2,402
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax at Dec. 31, 2015	(53)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax at Dec. 31, 2015	(12)
Retained Earnings, Unappropriated at Dec. 31, 2015	3,118		2,265	$ 2,265
Treasury Stock, Value at Dec. 31, 2015	(12)
Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2015	(65)			(3)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	5,443		5,022
Common Stock, Value, Outstanding	2,390		2,760	2,760
Stockholders' Equity Attributable to Noncontrolling Interest			129		129
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,151
AOCI before Tax, Attributable to Parent	(22)	(12)
Dividends, Common Stock	(329)		(305)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	17
Net Income (Loss) Attributable to Noncontrolling Interest			13		13
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			526
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent			0	0
Contributions from parent			100		0
Dividends			(305)	(297)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(8)
Other Comprehensive Income (Loss), Net of Tax	16
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	13
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Reclassified During Period, Net of Tax	0		0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	611		526	513
Proceeds from Contribution from Parent, net of return of Proceeds				100
Income Available to Common Shareholders	$ 595			$ 513
Dividends Declared Per Share of Common Stock (in dollars per share)	$ 2.30
Shares, Outstanding at Dec. 31, 2016	143			40
Stockholders' Equity before Treasury Stock at Dec. 31, 2016	$ 2,402
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax at Dec. 31, 2016	(36)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax at Dec. 31, 2016	(13)
Retained Earnings, Unappropriated at Dec. 31, 2016	3,384		2,481	$ 2,481
Treasury Stock, Value at Dec. 31, 2016	(12)
Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2016	(49)			(3)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	5,725		5,338
Common Stock, Value, Outstanding	2,390		2,860	$ 2,860
Stockholders' Equity Attributable to Noncontrolling Interest			134		$ 134
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 5,472
AOCI before Tax, Attributable to Parent	$ (13)	$ 3