CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Available to Common Shareholders	$ (528)	$ (119)	$ 595
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	(2)	(7)	4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	14	(1)	(17)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	0	0	(1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2	0	(1)
Other Comprehensive Income (Loss), Net of Tax	16	(1)	16
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	(512)	(120)	611
SCE&G
Other Comprehensive Income (Loss), Net of Tax	1	(1)	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(589)	(172)	526
Other Comprehensive Income (Loss)
Amortization of deferred employee benefit plan costs reclassified to net income, net of tax	0	(1)	0
Less comprehensive income attributable to noncontrolling interest	25	13	13
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	(588)	(173)	526
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(588)	(173)	526
SCEG excluding VIEs [Member]
Income Available to Common Shareholders	(614)	(185)	513
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	(613)	(186)	513
Interest Rate Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	9	7	7
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 7	$ (1)	$ 6