RATE AND OTHER REGULATORY MATTERS (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended		9 Months Ended	24 Months Ended				9 Months Ended		9 Months Ended										9 Months Ended				9 Months Ended						3 Months Ended							9 Months Ended		9 Months Ended						9 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 SCEG	Jul. 31, 2012 SCEG	May 15, 2014 SCEG	Oct. 01, 2013 SCEG	Dec. 31, 2012 SCEG	Sep. 30, 2013 Deferred Income Tax Charges [Member]	Dec. 31, 2012 Deferred Income Tax Charges [Member]	Sep. 30, 2013 Deferred Income Tax Charges [Member] SCEG	Dec. 31, 2012 Deferred Income Tax Charges [Member] SCEG	Sep. 30, 2013 Regulatory Clause Revenues, under-recovered [Member]	Dec. 31, 2012 Regulatory Clause Revenues, under-recovered [Member]	Sep. 30, 2013 Regulatory Clause Revenues, under-recovered [Member] SCEG	Dec. 31, 2012 Regulatory Clause Revenues, under-recovered [Member] SCEG	Sep. 30, 2013 Environmental Restoration Costs [Member]	Dec. 31, 2012 Environmental Restoration Costs [Member]	Sep. 30, 2013 Environmental Restoration Costs [Member] SCEG	Dec. 31, 2012 Environmental Restoration Costs [Member] SCEG	Sep. 30, 2013 Asset Retirement Obligation Costs [Member]	Dec. 31, 2012 Asset Retirement Obligation Costs [Member]	Sep. 30, 2013 Asset Retirement Obligation Costs [Member] SCEG	Dec. 31, 2012 Asset Retirement Obligation Costs [Member] SCEG	Sep. 30, 2013 Franchise agreement Costs	Dec. 31, 2012 Franchise agreement Costs	Sep. 30, 2013 Franchise agreement Costs SCEG	Dec. 31, 2012 Franchise agreement Costs SCEG	Sep. 30, 2013 Pension Costs [Member]	Dec. 31, 2012 Pension Costs [Member]	Sep. 30, 2013 Pension Costs [Member] SCEG	Mar. 31, 2013 Pension Costs [Member] SCEG	Dec. 31, 2012 Pension Costs [Member] SCEG	Sep. 30, 2013 Planned major maintenance [Member]	Dec. 31, 2012 Planned major maintenance [Member]	Sep. 30, 2013 Planned major maintenance [Member] SCEG	Dec. 31, 2012 Planned major maintenance [Member] SCEG	Sep. 30, 2013 Deferred Losses On Interest Rate Derivatives [Member]	Dec. 31, 2012 Deferred Losses On Interest Rate Derivatives [Member]	Sep. 30, 2013 Deferred Losses On Interest Rate Derivatives [Member] SCEG	Dec. 31, 2012 Deferred Losses On Interest Rate Derivatives [Member] SCEG	Sep. 30, 2013 Deferred Pollution Control Costs	Dec. 31, 2012 Deferred Pollution Control Costs	Sep. 30, 2013 Deferred Pollution Control Costs SCEG	Dec. 31, 2012 Deferred Pollution Control Costs SCEG	Sep. 30, 2013 unrecovered plant [Member]	Dec. 31, 2012 unrecovered plant [Member]	Sep. 30, 2013 unrecovered plant [Member] SCEG	Sep. 30, 2013 Other Regulatory Assets [Member]	Dec. 31, 2012 Other Regulatory Assets [Member]	Sep. 30, 2013 Other Regulatory Assets [Member] SCEG	Dec. 31, 2012 Other Regulatory Assets [Member] SCEG
Regulatory Assets
Demand Side Management Program Costs, Noncurrent			$ 16.9		$ 10.3		$ 19.6
MPG enviromental remediatio	26
Regulatory Noncurrent Asset, Amortization Period	30		30					70		70										90				20						14	12	30					30		30						14			30
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority						14	63
Regulatory Assets, Noncurrent	1,333.0	1,464.0	1,259.0				1,377.0	254.0	254.0	248.0	248.0	52.0	66.0	52.0	66.0	42.0	44.0	37.0	39.0	359.0	319.0	342.0	304.0	32.0	36.0	32.0	36.0	319.0	460.0	284.0		405.0	0	6.0	0	6.0	126.0	151.0	126.0	151.0	37.0	38.0	37.0	38.0	19.0	20.0	19.0	93.0	70.0	82.0	64.0
Amounts Recovered through Electric Rates to offset Turbine Expense				$ 18.4