RATE AND OTHER REGULATORY MATTERS ELECTRIC-BLRA (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Regulated Operations [Abstract]
Public Utilities Percentage Change in Retail Electric Rates Approved under BLRA	2.60%	2.80%	2.90%
Entity Information [Line Items]
Public Utilties increase (decrease) in retail electric rates	$ 64.5	$ 66.2	$ 67.2
SCE&G
Regulated Operations [Abstract]
Public Utilities Percentage Change in Retail Electric Rates Approved under BLRA	2.60%	2.80%	2.90%
Entity Information [Line Items]
Public Utilties increase (decrease) in retail electric rates	$ 64.5	$ 66.2	$ 67.2