CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Available to Common Shareholders	$ 746	$ 538	$ 471
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(12)	(14)	7
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	10	11	(18)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0	(5)	7
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	0	1	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0	(4)	8
Other Comprehensive Income (Loss), Net of Tax	10	(15)	26
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0	1	1
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	756	523	497
SCE&G
Other Comprehensive Income (Loss), Net of Tax	0	0	1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	480	458	391
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0	0	1
Amortization of deferred employee benefit plan costs reclassified to net income, net of tax	0	0	0
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	480	458	392
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	480	458	392
Genco
Other Comprehensive Income (Loss)
Less comprehensive income attributable to noncontrolling interest	14	12	11
SCEG excluding VIEs [Member]
Income Available to Common Shareholders	466	446	380
Net Income (Loss) Attributable to Parent [Abstract]
Total Comprehensive Income (Loss)	466	446	381
Interest Rate Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	7	7	8
Commodity Contract [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 15	$ (4)	$ 3