RATE AND OTHER REGULATORY MATTERS GAS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SCE&G
Entity Information [Line Items]
Public Utilities, Percent Increase (Decrease) in Retail Natural Gas Rates	1.20%		(0.60%)
Public Utilities, Authorized Allowable Return on Common Equity, Percentage	10.50%	11.00%	11.00%
Public Utilities changes in Retail Natural Gas Rates Approved under RSA	$ 4.1		$ 2.6
PSNC Energy [Member]
Entity Information [Line Items]
PSNC Energy Rate Case Application, Percentage Increase	4.39%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage	9.70%
PSNC Energy Rate Case Application, Increase Amount	$ 19.1