RATE AND OTHER REGULATORY MATTERS (Details 3) (USD $) In Millions, unless otherwise specified	6 Months Ended						6 Months Ended								6 Months Ended	12 Months Ended												6 Months Ended				12 Months Ended	9 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Deferred Income Tax Charges [Member]	Dec. 31, 2013 Deferred Income Tax Charges [Member]	Jun. 30, 2014 Asset Retirement Obligation Costs [Member]	Dec. 31, 2013 Asset Retirement Obligation Costs [Member]	Jun. 30, 2014 Storm damage reserve [Member]	Dec. 31, 2013 Storm damage reserve [Member]	Jun. 30, 2014 Monetization bankruptcy claim [Member]	Dec. 31, 2013 Monetization bankruptcy claim [Member]	Jun. 30, 2014 Deferred gains on interest rate derivatives [Member]	Dec. 31, 2013 Deferred gains on interest rate derivatives [Member]	Jun. 30, 2014 Planned major maintenance [Member]	Dec. 31, 2013 Planned major maintenance [Member]	Jun. 30, 2014 SCEG	Dec. 31, 2013 SCEG	Dec. 31, 2012 SCEG	Mar. 31, 2014 SCEG	Mar. 31, 2013 SCEG	Mar. 31, 2012 SCEG	Jun. 30, 2014 SCEG Deferred Income Tax Charges [Member]	Dec. 31, 2013 SCEG Deferred Income Tax Charges [Member]	Jun. 30, 2014 SCEG Asset Retirement Obligation Costs [Member]	Dec. 31, 2013 SCEG Asset Retirement Obligation Costs [Member]	Jun. 30, 2014 SCEG Storm damage reserve [Member]	Jun. 30, 2014 SCEG Deferred gains on interest rate derivatives [Member]	Jun. 30, 2014 SCEG Planned major maintenance [Member]	Jun. 30, 2014 Environmental Restoration Costs [Member]	Dec. 31, 2013 Environmental Restoration Costs [Member]	Jun. 30, 2014 Environmental Restoration Costs [Member] SCEG	Dec. 31, 2013 Environmental Restoration Costs [Member] SCEG	May 31, 2014 Gas Distribution [Member] SCEG	Sep. 30, 2014 Other Regulatory Assets [Member] SCEG
Regulatory Liabilities [Line Items]
Storm Damage Reserve Applied To Offset Net Lost Margin Related To DSM							$ 5.0
Public Utilities, Requested Rate Increase (Decrease), Amount	66.2																															3.0
Regulatory Assets, Noncurrent	1,558.0	1,360.0													1,499.0	1,303.0												41.0	41.0	36.0	37.0
MPG enviromental remediatio																												26
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates																2.90%	2.30%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage															11.00%
Demand Side Management Program Costs, Noncurrent																		15.4	16.9	19.6
Regulatory Liabilities	853	966	23	24	713	695	7	27	27	29	83	181	0	10	613	732	732				18	19	505	495	7	83	0
Annual Storm Damage Costs not offset by Amounts Recovered through Electric Rates							$ 2.5								$ 2.5
Regulatory Noncurrent Asset Amortization Period																																	50
Public Utilities, Requested Rate Increase (Decrease), Percentage																																0.00%