SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended						3 Months Ended		12 Months Ended				12 Months Ended															12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 SCEG and GENCO [Member]	Dec. 31, 2012 SCEG and GENCO [Member]	Dec. 31, 2011 SCEG and GENCO [Member]	Mar. 31, 2013 SCE&G	Dec. 31, 2012 SCE&G MW	Dec. 31, 2013 SCE&G	Dec. 31, 2012 SCE&G MW	Dec. 31, 2011 SCE&G	Apr. 30, 2012 SCE&G	Dec. 31, 2013 Genco	Dec. 31, 2012 Genco MW	Dec. 31, 2011 Genco	Dec. 31, 2013 CGT [Member]	Dec. 31, 2012 CGT [Member]	Dec. 31, 2011 CGT [Member]	Dec. 31, 2013 PSNC Energy	Dec. 31, 2012 PSNC Energy	Dec. 31, 2011 PSNC Energy	Dec. 31, 2013 Summer Station Unit 1 [Domain]	Dec. 31, 2012 Summer Station Unit 1 [Domain]	Dec. 31, 2013 Summer Station Unit 1 [Domain] SCE&G	Dec. 31, 2012 Summer Station Unit 1 [Domain] SCE&G	Dec. 31, 2013 Summer Station New Units [Domain]	Dec. 31, 2012 Summer Station New Units [Domain]	Dec. 31, 2012 SCE&G	Dec. 31, 2011 SCE&G	Mar. 31, 2014 SCE&G
Significant Accounting Policies
Maintenance Costs								$ 18,400,000		$ 18,400,000
Environmental Remediation Costs Recognized in Regulatory Assets								36,700,000		36,700,000
Undercollected balance fuel	41,600,000								41,600,000			80,600,000
Power Generation Capacity Megawatts														605
Decommissioning Liability, Noncurrent									696,800,000
Decommissioning safe storage									60
Unbilled Receivables, Current	183,100,000	189,800,000						129,000,000	111,900,000	129,000,000
Goodwill	230,000,000	230,000,000														20,000,000			210,000,000
Accumulated Amortization and Write-down, Goodwill																			230,000,000
Utilities Operating Expense, Maintenance									18,100,000	11,100,000
Anount accrued monthly for nuclear fuel outages							1,400,000			1,200,000
Number of coal fired units to be retired								6		6
power generation capacity six coal fired units								730		730
Nuclear refueling outage cost										32,300,000	34,100,000																	21,500,000	22,700,000
Jointly Owned Utility Plant, Share in Estimated Cash Outlay									5,400,000,000
Jointly Owned Utility Plant, Minimum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays										1
Jointly Owned Utility Plant, Maximum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays										5
Jointly Owned Utility Plant, Proportionate Ownership Share																						66.70%	66.70%			55.00%	55.00%			5.00%
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.93%	2.90%	2.90%	2.94%	2.91%	2.90%			2.96%	2.93%	2.92%		2.66%	2.66%	2.69%	2.19%	2.09%	2.00%	3.01%	3.01%	3.05%
Public Utilities, Allowance for Funds Used During Construction, Additions	0	0	0						0	0	0
Asset Management and Supply Service Agreements
Percentage of natural gas inventory held by counterparties under asset management and supply service agreements (as a percent)																			48.00%	44.00%
Natural gas inventory, carrying amount																			22,800,000	19,600,000
Property, Plant and Equipment, Net	317,000,000	306,000,000						57,000,000	69,000,000	57,000,000				476,000,000
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service																						1,100,000,000	1,100,000,000
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation																						566,900,000	557,000,000
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress																						127,100,000	113,600,000			2,300,000,000	1,800,000,000
Accrual period of nuclear refueling charges (in months)		18								18
Accounts Receivable, Net																								75,600,000	92,900,000
Payments to Acquire Investments to be Held in Decommissioning Trust Fund									$ 3,200,000
Earnings Per Share
Weighted Average Shares Outstanding - Basic	138.7	131.1	128.8
Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements	0.4	2.2	1.4
Weighted Average Number of Shares Outstanding, Diluted	139.1	133.3	130.2