SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended								6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 SCEG	Dec. 31, 2013 SCEG	Mar. 31, 2013 SCEG	Dec. 31, 2012 SCEG MW	Jun. 30, 2014 Genco MW	Jun. 30, 2014 PSNC Energy [Member]	Dec. 31, 2013 PSNC Energy [Member]
Significant Accounting Policies
Number of coal fired units to be retired								6	6
Number of Units retired							3
Power generation capacity six coal fired units									730
Power Generation Capacity Megawatts										605
Asset Management and Supply Service Agreements
Percentage of natural gas inventory held by counterparties under asset management and supply service agreements (as a percent)											41.00%	48.00%
Natural gas inventory, carrying amount											$ 15.8	$ 22.8
Property, Plant and Equipment, Net	$ 314		$ 314		$ 317	$ 69	$ 69			$ 473
PercentOfStorageFeesCreditedToRatePayers											75.00%
Earnings Per Share
Weighted Average Shares Outstanding - Basic	141.7	139.6	141.4	137.0
Incremental Shares Attributable Equity Forward Agreements	0	0	0	0.9
Weighted Average Number of Shares Outstanding, Diluted	141.7	139.6	141.4	137.9