DERIVATIVE FINANCIAL INSTRUMENTS Derivative Financial Instruments Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 131	$ 289
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	131	289
Derivative, Collateral, Right to Reclaim Securities	18	0
Derivative Asset, Fair Value, Gross Asset	57	21
Derivative Asset, Fair Value, Gross Liability	(1)	0
Derivative Asset	56	21
Derivative, Collateral, Obligation to Return Securities	(18)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	38	21
Derivative, Collateral, Right to Reclaim Cash	(63)	(152)
Derivative Liability, Fair Value, Amount Offset Against Collateral	50	137
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset	45	5
Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	1	6
Derivative Asset	11	16
Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	90	233
Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	40	50
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	115	257
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	115	257
Derivative, Collateral, Right to Reclaim Securities	18	0
Derivative Asset, Fair Value, Gross Asset	41
Derivative Asset	41
Derivative, Collateral, Obligation to Return Securities	(18)
Derivative Asset, Fair Value, Amount Offset Against Collateral	23
Derivative, Collateral, Right to Reclaim Cash	(52)	(131)
Derivative Liability, Fair Value, Amount Offset Against Collateral	45	126
Commodity Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	3	12
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	3	12
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Asset, Fair Value, Gross Asset	3	1
Derivative Asset, Fair Value, Gross Liability	(1)	0
Derivative Asset	2	1
Derivative, Collateral, Obligation to Return Securities		0
Derivative Asset, Fair Value, Amount Offset Against Collateral	2	1
Derivative, Collateral, Right to Reclaim Cash	3	10
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	2
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	13	20
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	13	20
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Asset, Fair Value, Gross Asset	13	20
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset	13	20
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	13	20
Derivative, Collateral, Right to Reclaim Cash	8	11
Derivative Liability, Fair Value, Amount Offset Against Collateral	5	9
SCEG
Derivative [Line Items]
Derivative Liability	94	233
Derivative Asset	41
SCEG | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	75	208
SCEG | Other Deferred Credits and Other Liabilities [Member]
Derivative [Line Items]
Derivative Liability	19	25
SCEG | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	94	233
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	94	233
Derivative, Collateral, Right to Reclaim Securities	18	0
Derivative Asset, Fair Value, Gross Asset	41
Derivative Asset	41
Derivative, Collateral, Obligation to Return Securities	(18)
Derivative Asset, Fair Value, Amount Offset Against Collateral	23
Derivative, Collateral, Right to Reclaim Cash	30	107
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 46	$ 126