CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 105	$ 99	$ 281	$ 499
Other Comprehensive Income (Loss)
Unrealized gains (losses) on cash flow hedging activities arising during period	2	2	3	(1)
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	5	6	7	12
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0	0	0	4
Other Comprehensive Income (Loss)	5	6	7	8
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			229	237
Less comprehensive income attributable to noncontrolling interest			6	7
Comprehensive income available to common shareholder	110	105	288	507
SCEG
Other Comprehensive Income (Loss)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	113	111
Genco
Other Comprehensive Income (Loss)
Less comprehensive income attributable to noncontrolling interest	3	4
SCE&G (including Fuel Company)
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic			223	230
Other Comprehensive Income (Loss)
Comprehensive income available to common shareholder	110	107	223	230
Commodity Contract
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	1	2	6	9
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)