CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Available to Common Shareholders	$ 595	$ 746	$ 538
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	4	(12)	(14)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	17	10	11
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0	0	(5)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(1)	0	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(1)	0	(4)
Other Comprehensive Income (Loss), Net of Tax	16	10	(15)
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	611	756	523
SCE&G
Other Comprehensive Income (Loss), Net of Tax		0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	526	480	458
Other Comprehensive Income (Loss)
Amortization of deferred employee benefit plan costs reclassified to net income, net of tax	0	0	0
Less comprehensive income attributable to noncontrolling interest	13	14	12
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	526	480	458
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	526	480	458
SCEG excluding VIEs [Member]
Income Available to Common Shareholders	513	466	446
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	513	466	446
Interest Rate Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	7	7	7
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 6	$ 15	$ (4)