COMMON EQUITY (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Capitalization, Equity [Line Items]
Dividends, Common Stock	$ 82
Common Stock, Shares Authorized	200.0		200.0
COMMON EQUITY [Abstract]
Common Stock, Shares, Outstanding	142.9		142.9
Other Comprehensive Income (Loss), Net of Tax	$ 2	$ 2
Other comprehensive income (loss), unrealized holding gain (loss) net of reclassification to AOCI arising during period, net of tax	2	6
SCEG
Schedule of Capitalization, Equity [Line Items]
Dividends	74	70
Dividends, Common Stock	$ 74	71
Common Stock, Shares Authorized	50.0		50.0
COMMON EQUITY [Abstract]
Common Stock, Shares, Outstanding	40.3		40.3
Preferred Stock, Shares Authorized	20.0		20.0
Preferred Stock, Shares Outstanding	0.0		0.0
SCEG excluding VIEs [Member]
Schedule of Capitalization, Equity [Line Items]
Dividends	$ 72	69
Commodity Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(5)	(7)
Interest Rate Contract [Member]
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	(2)
Gas Purchased for Resale [Member] [Member] | Cash Flow Hedging [Member] | Commodity Contract
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	5	7
Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Schedule of Capitalization, Equity [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 2	$ 2