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
Common Stock, Dividends, Per Share, Declared	$ 1.225
Net Income (Loss) Available to Common Stockholders, Basic	$ 292			$ 231
Net Income (Loss) Attributable to Noncontrolling Interest			7		7
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			238
Dividends			160	155
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(5)
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	289			231
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	0
Dividends, Common Stock	(175)		(160)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(5)
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	3,501			2,557
AOCI before Tax, Attributable to Parent	(2)	$ (5)
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
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (2)	(5)
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
Proceeds from Contributions from Parent			20		20
Proceeds from Contributions from Parent	$ 20
Common Stock, Dividends, Per Share, Declared	$ 0.7362
Net Income (Loss) Available to Common Stockholders, Basic	$ 177			$ 150
Net Income (Loss) Attributable to Noncontrolling Interest			9		9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			159
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	4
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	10
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	6
Other Comprehensive Income (Loss)	11
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	188			150
Treasury Stock Purchased	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1
Dividends, Common Stock	(105)		(74)
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	4
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	10
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	2,987		2,060	2,060
AOCI before Tax, Attributable to Parent	(7)	4
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		$ 169
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,085
Stockholders' Equity Attributable to Parent	5,337		4,916
Common Stock, Value, Outstanding	$ 2,389		$ 2,860	$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (7)	$ 4