RATE AND OTHER REGULATORY MATTERS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended		12 Months Ended						12 Months Ended				3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		9 Months Ended									9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 SCEG	Sep. 30, 2014 SCEG	Sep. 30, 2013 SCEG	May 01, 2015 SCEG	Dec. 31, 2013 SCEG	Dec. 31, 2012 SCEG	Mar. 31, 2014 SCEG	Mar. 31, 2013 SCEG	Mar. 31, 2012 SCEG	Dec. 31, 2013 PSNC Energy	Sep. 30, 2014 PSNC Energy	Sep. 30, 2014 Pension Costs [Member]	Dec. 31, 2013 Pension Costs [Member]	Dec. 31, 2012 Pension Costs [Member] SCEG	Sep. 30, 2014 Pension Costs [Member] SCEG	Dec. 31, 2013 Pension Costs [Member] SCEG	Sep. 30, 2014 Other Regulatory Assets [Member]	Dec. 31, 2013 Other Regulatory Assets [Member]	Sep. 30, 2014 Other Regulatory Assets [Member] SCEG	Dec. 31, 2013 Other Regulatory Assets [Member] SCEG	Sep. 30, 2014 Deferred Pollution Control Costs	Dec. 31, 2013 Deferred Pollution Control Costs	Dec. 31, 2013 Deferred Pollution Control Costs SCEG	Sep. 30, 2014 Franchise agreement Costs	Dec. 31, 2013 Franchise agreement Costs	Sep. 30, 2014 Franchise agreement Costs SCEG	Dec. 31, 2013 Franchise agreement Costs SCEG	Sep. 30, 2014 Planned major maintenance [Member] SCEG	Sep. 30, 2014 Storm damage reserve [Member]
Rate Matters [Line Items]
Amounts Recovered Through Electric Rates to offset Nuclear Related Outage Costs					$ 17.2
Net Lost Revenues associated with DSM programs					6.6
Fuel Costs					10.3
Undercollected balance fuel								46
Carrying costs on deferred income tax assets				1.6	4.1
Storm reserve applied to offset storm damage costs																																16.2
Carrying cost recovery	(7)	0			(7)	0
Regulatory Assets, Noncurrent	1,564.0		1,360.0	1,506.0	1,506.0			1,303.0						1.1	222.0	238.0		201.0	215.0	52.0	48.0	42.0	39.0	36.0	37.0	37.0	27.0	31.0	27.0	31.0
Number of coal fired units to be retired									6		6
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates					2.80%			2.90%	2.30%
Allowable return on common equity (as a percent)					11.00%
Demand Side Management Program Costs, Noncurrent										15.4	16.9	19.6
Regulatory Asset Recovery Assessments							12
Increase (decrease) in retail electric rate requested under the BLRA					66.2			67.2	52.1
Public Utilities, Percent Increase (Decrease) in Retail Natural Gas Rates					0.60%				2.10%
Public Utilities changes in Retail Natural Gas Rates Approved under RSA					2.6				7.5
Public Utilities, Rate Calculation Basis					12-month rolling average								12
Regulatory Noncurrent Asset Amortization Period																	30	12	14	33		50
Amounts Recovered through Electric Rates to offset Turbine Expense																															18.4
Public Utilities Base Fuel under Collected Balance Recovery Period	12				12
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority																	63	14
Derivative, Gain on Derivative					17.8
Storm Damage Reserve Cost Applied					5.0
Reduction to Net Lost Revenues from DSM programs					25.00%
Reduction to DSM Program costs deferred					6.6
Number of Units retired								3
Demand side management recovery period					10
Storm Damage Reserve Applied To Offset Net Lost Margin Related To DSM																																5.0
Amount Allowed to be Recovered through Electric Rates to Offset Incremental Storm Damage Costs					$ 100																											$ 100