CONSOLIDATED STATEMENTS OF COMMON EQUITY - USD ($) shares in Millions, $ in Millions	Total	AOCI Attributable to Parent [Member]	SCEG	SCEG excluding VIEs [Member]	SCEG and GENCO [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity before Treasury Stock	$ 2,402
Treasury Stock, Value	(12)
Retained Earnings, Appropriated	3,384			$ 2,481
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(36)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(13)
Accumulated Other Comprehensive Income (Loss)	(49)			(3)
Stockholders' Equity Attributable to Noncontrolling Interest					$ 134
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 5,472
Stockholders' Equity Attributable to Parent	$ 5,725
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding	143			40
Net Income (Loss) Available to Common Stockholders, Basic	$ 171			$ 109
Net Income (Loss) Attributable to Noncontrolling Interest					3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			112
Dividends			(79)	(77)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(2)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(2)
Other Comprehensive Income (Loss)	(2)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	169
Treasury Stock Purchased	(1)
Dividends, Common Stock	(87)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(2)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	$ (2)
Common Stock, Dividends, Per Share, Declared	$ 1.838
Net Income (Loss) Available to Common Stockholders, Basic	$ 326
Net Income (Loss) Attributable to Noncontrolling Interest			10
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			280
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(5)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	4
Other Comprehensive Income (Loss)	0		280
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	326			270
Dividends, Common Stock			(240)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(5)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(1)
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	3,468			2,513
AOCI before Tax, Attributable to Parent		$ (2)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(38)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(13)
Accumulated Other Comprehensive Income (Loss)	(51)			(3)
Stockholders' Equity Attributable to Noncontrolling Interest					135
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,505
Stockholders' Equity Attributable to Parent	$ 5,806
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent		(2)
Net Income (Loss) Available to Common Stockholders, Basic	$ 121			$ 122
Net Income (Loss) Attributable to Noncontrolling Interest					4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			126
Dividends			(81)	(78)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(3)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	2
Other Comprehensive Income (Loss)	(1)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	120
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	0
Dividends, Common Stock	(88)
Proceeds from Contribution from Parent, net of return of Proceeds				2,860
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(3)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	(1)
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	3,501			2,557
AOCI before Tax, Attributable to Parent	(2)	(3)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(39)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(13)
Accumulated Other Comprehensive Income (Loss)	(52)			$ (3)
Stockholders' Equity Attributable to Noncontrolling Interest					136
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 5,550
Stockholders' Equity Attributable to Parent	$ 5,838
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (2)	(3)
Common Stock, Dividends, Per Share, Declared	$ 0.6125		$ 81,000,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 34			$ 39
Net Income (Loss) Attributable to Noncontrolling Interest			$ 3		3
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			42
Dividends			(80)	(78)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	1
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	2
Other Comprehensive Income (Loss)	3		42
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	37			39
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1
Dividends, Common Stock	(88)
Proceeds from Contribution from Parent, net of return of Proceeds				2,860
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	1
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	2
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	3,447			2,518
AOCI before Tax, Attributable to Parent	(3)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(37)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(12)
Accumulated Other Comprehensive Income (Loss)	(49)			$ (3)
Stockholders' Equity Attributable to Noncontrolling Interest					137
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,512
Stockholders' Equity Attributable to Parent	$ 5,787
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (3)
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(12)
Retained Earnings, Appropriated	2,915		1,982	$ 1,982
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(37)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(13)
Accumulated Other Comprehensive Income (Loss)	(50)			(4)
Stockholders' Equity Attributable to Noncontrolling Interest			142		142
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			4,980
Stockholders' Equity Attributable to Parent	5,255		4,838
Common Stock, Value, Outstanding	$ 2,390		2,860	$ 2,860
Shares, Outstanding	143			40
Common Stock, Dividends, Per Share, Declared	$ 0.6125
Net Income (Loss) Available to Common Stockholders, Basic	$ 169			$ 124
Net Income (Loss) Attributable to Noncontrolling Interest					4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			128
Dividends			(74)	(72)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	3
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	4
Other Comprehensive Income (Loss)	8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	177
Treasury Stock Purchased	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1
Dividends, Common Stock	(87)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	3
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	7
Proceeds from Contributions from Parent			20
Proceeds from Contributions from Parent	$ 20
Common Stock, Dividends, Per Share, Declared	$ 0.8599
Net Income (Loss) Available to Common Stockholders, Basic	$ 244
Net Income (Loss) Attributable to Noncontrolling Interest			15
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			262
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	5
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	14
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	9
Other Comprehensive Income (Loss)	16		263
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	260			247
Dividends, Common Stock			(91)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	5
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	14
Retained Earnings, Appropriated	2,997			2,034
AOCI before Tax, Attributable to Parent	(5)	3
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(30)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(12)
Accumulated Other Comprehensive Income (Loss)	(42)			(4)
Stockholders' Equity Attributable to Noncontrolling Interest					144
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,034
Stockholders' Equity Attributable to Parent	5,344
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding				40
AOCI before Tax, Attributable to Parent	(5)	3
Net Income (Loss) Available to Common Stockholders, Basic	8			$ 26
Net Income (Loss) Attributable to Noncontrolling Interest					5
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			31
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	2
Other Comprehensive Income (Loss)	3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	11
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	0
Dividends, Common Stock	(18)
Proceeds from Contribution from Parent, net of return of Proceeds	20
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	0
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	3
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	2,987			2,060
AOCI before Tax, Attributable to Parent	(2)	1
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(27)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(12)
Accumulated Other Comprehensive Income (Loss)	(39)			(4)
Stockholders' Equity Attributable to Noncontrolling Interest					169
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 5,085
Stockholders' Equity Attributable to Parent	$ 5,337
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (2)	1
Common Stock, Dividends, Per Share, Declared	$ 0.1237		$ 17,000,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 67			$ 97
Net Income (Loss) Attributable to Noncontrolling Interest			$ 6		6
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			103		104
Dividends			(17)	(11)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	1
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	3
Other Comprehensive Income (Loss)	5		104
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	72			97
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1		1
Dividends, Common Stock	(18)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					(6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Remeasurement and Curtailment Adjustement, Net of Tax	1
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	4
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	3,036		2,146	2,146
AOCI before Tax, Attributable to Parent	(4)	1
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(23)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(11)
Accumulated Other Comprehensive Income (Loss)	(34)			(3)
Stockholders' Equity Attributable to Noncontrolling Interest			169		$ 169
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,172
Stockholders' Equity Attributable to Parent	5,391		5,003
Common Stock, Value, Outstanding	$ 2,389		$ 2,860	$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (4)	$ 1