REGULATORY ASSETS AND LIABILITIES(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Regulatory Assets, Noncurrent	$ 1,937	$ 1,823	$ 1,823
Regulatory Liability, Noncurrent	855		814
Asset Retirement Obligation Costs [Member]
Regulatory Liability, Noncurrent	732		703
Deferred gains on interest rate derivatives [Member]
Regulatory Liability, Noncurrent	96		82
Other Regulatory Liability [Member]
Regulatory Liability, Noncurrent	27		29
Demand Side Management programs [Member]
Regulatory Assets, Noncurrent	$ 61		56
Deferred Income Tax Charge [Member]
Regulatory Asset, Amortization Period	85 years
Regulatory Assets, Noncurrent		284	298
Asset Retirement Obligation Costs [Member]
Regulatory Asset, Amortization Period	110 years
Regulatory Assets, Noncurrent		366	405
Pension Costs [Member]
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority	$ 14	63
Regulatory Assets, Noncurrent		350	325
Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets, Noncurrent		453	535
Canadys Refined Coal [Member]
Regulatory Assets, Noncurrent			127
Environmental Restoration Costs [Member]
MPG environmental remediation	24
Regulatory Assets, Noncurrent	$ 42		40
DSM Programs [Member]
Regulatory Asset, Amortization Period	5 years
Other Regulatory Assets [Member]
Regulatory Assets, Noncurrent	$ 144		137
SCE&G
Regulatory Assets, Noncurrent	1,857	1,745	1,745
Regulatory Liability, Noncurrent	635		610
SCE&G | Asset Retirement Obligation Costs [Member]
Regulatory Liability, Noncurrent	519		505
SCE&G | Deferred gains on interest rate derivatives [Member]
Regulatory Liability, Noncurrent	96		82
SCE&G | Other Regulatory Liability [Member]
Regulatory Liability, Noncurrent	20		23
SCE&G | Demand Side Management programs [Member]
Regulatory Assets, Noncurrent	$ 61		56
SCE&G | Deferred Income Tax Charge [Member]
Regulatory Asset, Amortization Period	85 years
Regulatory Assets, Noncurrent		278	291
SCE&G | Asset Retirement Obligation Costs [Member]
Regulatory Asset, Amortization Period	110 years
Regulatory Assets, Noncurrent		$ 347	384
SCE&G | Pension Costs [Member]
Regulatory Asset, Amortization Period	12 years	14 years
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority	$ 14	$ 63
Regulatory Assets, Noncurrent		310	295
SCE&G | Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets, Noncurrent	535	453
SCE&G | Canadys Refined Coal [Member]
Regulatory Assets, Noncurrent		137	127
SCE&G | Environmental Restoration Costs [Member]
Regulatory Assets, Noncurrent	$ 35		36
SCE&G | DSM Programs [Member]
Regulatory Asset, Amortization Period	5 years
SCE&G | Other Regulatory Assets [Member]
Regulatory Assets, Noncurrent		$ 128	$ 129
Pension Plan, Defined Benefit | SCE&G | Other Regulatory Assets [Member]
Regulatory Asset, Amortization Period	30 years