INCOME TAXES INCOME TAXES (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	$ 135	$ 127
Deferred tax Nuclear Decommissioning	199	216
Deferred Tax Assets, Financial Instruments	35	40
Deferred Tax Asset, Unamortized Investment, Tax Credits	16	17
Deferred Tax Asset, Deferred Fuel Cost	8
Deferred Tax Assets, Monetization of Bankruptcy Claims	0	10
Deferred Tax Liabilities, Tax Deferred Expense Compensation and Benefits, Employee Benefits	96	107
Deferred Tax Assets, Other	5	10
Deferred Tax Assets, Net	398	420
Deferred Tax Liabilities, Gross [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	1,906	1,928
Deferred Tax Liabilities, Asset Retirement Obligation	135	122
Deferred Tax Liabilities, Deferred Expense Fuel Costs	0	27
Deferred tax asset unrecovered plant	49	53
Deferred Tax Liabilities, Derivatives	0	21
Deferred Tax Liability, Demand Side Management	23	21
deferred tax liability, prepayments	31	27
Deferred Tax Liabilities, Other	65	45
Deferred Tax Liabilities, Gross	2,305	2,351
Deferred Tax Liabilities, Net, Noncurrent	1,907	1,931
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross increases current period tax positions	2
Balance at the end of the period	49	16	$ 3
SCE&G
Investments, Owned, Federal Income Tax Note [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	49
Deferred Tax Assets, Net [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	52	47
Deferred tax Nuclear Decommissioning	187	205
Deferred Tax Assets, Financial Instruments	2
Deferred Tax Asset, Unamortized Investment, Tax Credits	16	17
Deferred Tax Asset, Deferred Fuel Cost	7
Deferred Tax Liabilities, Tax Deferred Expense Compensation and Benefits, Employee Benefits	85	91
Deferred Tax Assets, Other	2	6
Deferred Tax Assets, Net	266	275
Deferred Tax Liabilities, Gross [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	1,644	1,623
Deferred Tax Liabilities, Asset Retirement Obligation	127	115
Deferred Tax Liabilities, Deferred Expense Fuel Costs	0	27
Deferred tax asset unrecovered plant	49	53
Deferred Tax Liabilities, Derivatives	0	21
Deferred Tax Liability, Demand Side Management	23	21
deferred tax liability, prepayments	29	25
Deferred Tax Liabilities, Other	41	23
Deferred Tax Liabilities, Gross	1,998	1,999
Deferred Tax Liabilities, Net, Noncurrent	1,732	1,724
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	33	0	0
Gross decreases tax positions in prior period	(2)	0	0
Gross increases current period tax positions	2	13	3
Balance at the end of the period	$ 49	$ 16	$ 3