DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Gain (Loss) on Derivatives
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial	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	$ 1	$ 3
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	2	(4)
Derivative, Credit Risk Related Contingent Features [Abstract]
Collateral Already Posted, Aggregate Fair Value	30.9		26.8
Additional collateral required to be posted to counterparties if all underlying contingent features were fully triggered	78.1		0
Aggregate fair value of all derivative instruments with contingent provisions that are in a net liability position	109.0		25.2
Cashcollateralrequestedfromcounterparty	2.0		34.1
Derivative, net asset position	2.0		34.1
LetterofCreditAvailableCommodityDerivatives,assetposition	5.0		6.0
Commodity Derivative, net asset position	7.0		6.0
Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net	(3)	35
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	(1)	(1)
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
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(2)	(2)
Commodity Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	1.0
Effect of Cash Flow Hedges on Statement of Income
Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Derivatives Arising During Period, Net of Tax	(3)	(2)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	4	(2)
SCEG
Gain (Loss) on Derivatives
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial	insignificant	insignificant
Derivative, Credit Risk Related Contingent Features [Abstract]
Collateral Already Posted, Aggregate Fair Value	4.1		1.5
Additional collateral required to be posted to counterparties if all underlying contingent features were fully triggered	80.1		0
Aggregate fair value of all derivative instruments with contingent provisions that are in a net liability position	84.2		1.0
Cashcollateralrequestedfromcounterparty	0		31.7
Derivative, net asset position	0		31.7
SCEG | Interest Rate Contract
Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) Deferred in Regulatory Accounts Effective Portion, Net	(3)	35
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	(1)	(1)
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	6.2
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	(67.8)
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	0
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
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	(67.8)
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income Effective Portion, Net	0
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