RATE AND OTHER REGULATORY MATTERS (Details 2) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Regulatory Assets
Regulatory Liabilities	$ 864	$ 855
Regulatory Assets, Noncurrent	2,202	1,937
SCEG
Regulatory Assets
Regulatory Liabilities	630	635
Regulatory Assets, Noncurrent	$ 2,114	1,857
Demand side management recovery period	5
Other Regulatory Liability [Member]
Regulatory Assets
Regulatory Liabilities	$ 28	27
Other Regulatory Liability [Member] | SCEG
Regulatory Assets
Regulatory Liabilities	17	20
Asset Retirement Obligation Costs [Member]
Regulatory Assets
Regulatory Liabilities	756	732
Asset Retirement Obligation Costs [Member] | SCEG
Regulatory Assets
Regulatory Liabilities	533	519
Deferred gains on interest rate derivatives [Member]
Regulatory Assets
Regulatory Liabilities	80	96
Deferred gains on interest rate derivatives [Member] | SCEG
Regulatory Assets
Regulatory Liabilities	80	96
Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	791	535
Deferred Losses On Interest Rate Derivatives [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	791	535
Asset Retirement Obligation Costs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	402	405
Asset Retirement Obligation Costs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	380	384
unrecovered plant [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	119	127
unrecovered plant [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	119	127
Demand Side Management programs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	58	61
Demand Side Management programs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	58	61
Deferred costs uncertain tax position [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	14	0
Deferred Income Tax Charges [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	301	298
Deferred Income Tax Charges [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	294	291
Environmental Restoration Costs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	33	42
Environmental Restoration Costs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	26	35
Pension Costs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	311	325
Pension Costs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	282	295
Other Regulatory Assets [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	173	144
Other Regulatory Assets [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	$ 150	$ 129