DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Gain (Loss) on Derivatives
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial	insignificant	insignificant	insignificant	insignificant
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	$ (2)	$ (1)	$ (3)	$ 3
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(2)	(2)	(1)	(7)
Derivative, Credit Risk Related Contingent Features [Abstract]
Collateral Already Posted, Aggregate Fair Value	69.0		69.0		26.8
Additional collateral required to be posted to counterparties if all underlying contingent features were fully triggered	117.0		117.0		0
Aggregate fair value of all derivative instruments with contingent provisions that are in a net liability position	187.0		187.0		25.2
Cashcollateralrequestedfromcounterparty	0		0		34.1
Derivative, net asset position	0		0		34.1
LetterofCreditAvailableCommodityDerivatives,assetposition	5.0		5.0		6.0
Commodity Derivative, net asset position	6.0		6.0		6.0
Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net	(1)	19	(5)	115
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	(1)	(1)	(2)	(2)
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	0	0	(4)	4
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	2	2	5	5
Commodity Contract
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	(2)	(1)	1	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	0	0	(4)	2
SCEG
Gain (Loss) on Derivatives
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial	insignificant	insignificant	insignificant	insignificant
Derivative, Credit Risk Related Contingent Features [Abstract]
Collateral Already Posted, Aggregate Fair Value	40.1		40.1		1.5
Additional collateral required to be posted to counterparties if all underlying contingent features were fully triggered	118.6		118.6		0
Aggregate fair value of all derivative instruments with contingent provisions that are in a net liability position	158.6		158.6		1.0
Cashcollateralrequestedfromcounterparty	0		0		31.7
Derivative, net asset position	0		0		31.7
SCEG | Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net	(1)	19	(5)	115
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	(1)	(1)	(2)	(2)
GasPurchaseforResale [Member] | Commodity Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			insignificant
Interest Expense [Member] | Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			(6.3)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			9.6
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	5		60
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	(35)		(220)
Not Designated as Hedging Instrument [Member] | SCEG | Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			9.6
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	5		60
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	$ (35)		$ (220)