CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 99	$ 96	$ 499	$ 289
Other Comprehensive Income (Loss)
Unrealized gains (losses) on cash flow hedging activities arising during period	2	(2)	1	1
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	6	(1)	12	(2)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0	0	4	0
Other Comprehensive Income (Loss)	6	(1)	8	(2)
Comprehensive income available to common shareholder	105	95	507	287
SCEG
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	111	99	237	225
Other Comprehensive Income (Loss)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111	99	237	225
Comprehensive income available to common shareholder			237	225
Genco
Other Comprehensive Income (Loss)
Less comprehensive income attributable to noncontrolling interest	4	3	7	6
SCE&G (including Fuel Company)
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic			230	219
Other Comprehensive Income (Loss)
Comprehensive income available to common shareholder	107	96	230	219
Commodity Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	(1)	9	(5)
Interest Rate Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	2	4	4
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (2)	$ (2)	$ (4)	$ (4)