SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
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%		48.00%		45.00%
Natural gas inventory, carrying amount	$ 20.4		$ 20.4		$ 28.7
Property, Plant and Equipment, Net	307		307		305
Earnings Per Share
Weighted Average Shares Outstanding - Basic	131,400,000	129,100,000	130,800,000	128,500,000
Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements	2,400,000	1,200,000	2,300,000	1,300,000
Weighted Average Number of Shares Outstanding, Diluted	133,800,000	130,300,000	133,100,000	129,800,000
SCE&G
Significant Accounting Policies
Power Generation Capacity Megawatts	1,117		1,117
Asset Management and Supply Service Agreements
Property, Plant and Equipment, Net	58		58		52
Genco
Significant Accounting Policies
Power Generation Capacity Megawatts	605		605
Asset Management and Supply Service Agreements
Property, Plant and Equipment, Net	$ 480		$ 480