RATE AND OTHER REGULATORY MATTERS RATE AND OTHER REGULATORY MATTERS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
Derivative, Gain on Derivative		$ 17.8
Undercollected balance fuel		46
Carrying cost recovery		5.8	2.9
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates				4.23%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage				10.25%
Prior accrual of under collected fuel			8.5
Gain (Loss) on Sale of Derivatives			8.5
Number of coal fired units to be retired				6	6
Number of coal fired units retired			3
Demand Side Management Program Costs, Noncurrent		15.4	16.9	19.6	19.6
Storm Damage Reserve Cost Applied		5.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		5.0
Reduction to Net Lost Revenues from DSM Programs Percent		25.00%
Net Lost Revenues associated with DSM Programs Dollars	33.0	6.6
SCE&G
Derivative, Gain on Derivative		17.8
Fuel Cost Increase To Base Fuel Costs		10.3
Undercollected balance fuel		46
Carrying cost recovery		5.8	2.9
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates					4.23%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage					10.25%
Prior accrual of under collected fuel			8.5
Gain (Loss) on Sale of Derivatives			8.5
Number of coal fired units to be retired				6	6
Number of coal fired units retired			3
Demand Side Management Program Costs, Noncurrent		15.4	16.9	19.6	19.6
Storm Damage Reserve Cost Applied		5.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		5.0
Reduction to Net Lost Revenues from DSM Programs Percent		25.00%
Net Lost Revenues associated with DSM Programs Dollars	$ 33.0	$ 6.6