DERIVATIVE FINANCIAL INSTRUMENTS OFFSETTING ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Liability	$ 106	$ 289
Derivative Asset, Fair Value, Gross Liability	(1)	0
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)	0
Derivative Asset, Fair Value, Gross Asset	31	21
Derivative Liability, Fair Value, Gross Asset	(1)	0
Derivative Liabilities, Net Amount	48	137
Derivative Liability, Fair Value, Gross Liability	107	289
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)	0
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral Posted	(50)	(152)
Derivative Assets, Net Amount	22	21
Other Current Assets [Member]
Derivative [Line Items]
Derivative Liability	3	6
Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	50	233
Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	53	50
Interest Rate Contract
Derivative [Line Items]
Derivative Liability	87	257
Derivative Asset, Fair Value, Gross Liability	0
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)
Derivative Asset, Fair Value, Gross Asset	15
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liabilities, Net Amount	43	126
Derivative Liability, Fair Value, Gross Liability	87	257
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)	0
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral Posted	(36)	(131)
Derivative Assets, Net Amount	7
Commodity Contracts
Derivative [Line Items]
Derivative Liability	5	12
Derivative Asset, Fair Value, Gross Liability	0
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	0
Derivative Asset, Fair Value, Gross Asset	1	1
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liabilities, Net Amount	0	2
Derivative Liability, Fair Value, Gross Liability	5	12
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	0	0
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral Posted	(5)	(10)
Derivative Assets, Net Amount	1	1
Other Energy Management Contract [Member]
Derivative [Line Items]
Derivative Liability	14	20
Derivative Asset, Fair Value, Gross Liability	(1)	0
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	0
Derivative Asset, Fair Value, Gross Asset	15	20
Derivative Liability, Fair Value, Gross Asset	(1)	0
Derivative Liabilities, Net Amount	5	9
Derivative Liability, Fair Value, Gross Liability	15	20
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	0	0
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral Posted	(9)	(11)
Derivative Assets, Net Amount	14	20
SCE&G
Derivative [Line Items]
Derivative Liability	65	233
SCE&G | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	34	208
SCE&G | Other Deferred Credits and Other Liabilities
Derivative [Line Items]
Derivative Liability	31	25
SCE&G | Interest Rate Contract
Derivative [Line Items]
Derivative Liability	65	233
Derivative Asset, Fair Value, Gross Liability	0
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)
Derivative, Collateral, Obligation to Return Cash	0
Derivative Asset, Fair Value, Gross Asset	15
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liabilities, Net Amount	44	126
Derivative Liability, Fair Value, Gross Liability	65	233
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	(8)	0
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral Posted	(13)	$ (107)
Derivative Assets, Net Amount	$ 7