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	3,118			$ 2,265
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(53)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(12)
Accumulated Other Comprehensive Income (Loss)	(65)			(3)
Stockholders' Equity Attributable to Noncontrolling Interest					$ 129
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 5,151
Stockholders' Equity Attributable to Parent	$ 5,443
Common Stock, Value, Outstanding				$ 2,760
Shares, Outstanding	143			40
Common Stock, Dividends, Per Share, Declared	$ 1.7250
Net Income (Loss) Available to Common Stockholders, Basic	$ 471			$ 423
Net Income (Loss) Attributable to Noncontrolling Interest			10		10
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			433
Proceeds from Contribution from Parent, net of return of Proceeds				100
Dividends			225	219
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	(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	8
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	12
Other Comprehensive Income (Loss)	8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	479			423
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	0
Dividends, Common Stock	(247)		(225)
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	(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	8
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(12)
Retained Earnings, Appropriated	3,342			2,469
AOCI before Tax, Attributable to Parent	(12)	$ (4)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(45)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(12)
Accumulated Other Comprehensive Income (Loss)	(57)			(3)
Stockholders' Equity Attributable to Noncontrolling Interest					133
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,459
Stockholders' Equity Attributable to Parent	$ 5,675
Common Stock, Value, Outstanding				$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (12)	(4)
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(12)
Retained Earnings, Appropriated	3,384		2,481	$ 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		134
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,472
Stockholders' Equity Attributable to Parent	5,725		5,338
Common Stock, Value, Outstanding	$ 2,390		2,860	$ 2,860
Shares, Outstanding	143			40
Common Stock, Dividends, Per Share, Declared	$ 1.8375
Net Income (Loss) Available to Common Stockholders, Basic	$ 326			$ 270
Net Income (Loss) Attributable to Noncontrolling Interest			10		10
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			280
Dividends			240	233
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					7
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	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	4
Other Comprehensive Income (Loss)	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	326			270
Treasury Stock Purchased	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	1
Dividends, Common Stock	(263)		(240)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders					7
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	(1)
Stockholders' Equity before Treasury Stock	2,402
Treasury Stock, Value	(13)
Retained Earnings, Appropriated	3,447		2,518	2,518
AOCI before Tax, Attributable to Parent	(5)	(5)
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		$ 137
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			5,512
Stockholders' Equity Attributable to Parent	5,787		5,375
Common Stock, Value, Outstanding	$ 2,389		$ 2,860	$ 2,860
Shares, Outstanding	143			40
AOCI before Tax, Attributable to Parent	$ (5)	$ (5)