RATE AND OTHER REGULATORY MATTERS (Details 3) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory Assets, Noncurrent	$ 2,068	$ 1,937
Regulatory Liabilities	847	855
SCEG
Regulatory Liabilities [Line Items]
Regulatory Assets, Noncurrent	1,986	1,857
Regulatory Liabilities	623	635
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	739	732
Asset Retirement Obligation Costs [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	522	519
Deferred gains on interest rate derivatives [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	81	96
Deferred gains on interest rate derivatives [Member] | SCEG
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 81	$ 96