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Represents the carrying value of natural gas inventory held by counterparties under the asset management and supply service agreements.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and equity forward arrangements using the reverse treasury stock method.

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Represents the percentage of natural gas inventory held by counterparties under the asset management and supply service agreements.

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Represents the generation capacity (in MW) of the nuclear electric generation units.

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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)	41.00%		41.00%		45.00%
Natural gas inventory, carrying amount	$ 14.6		$ 14.6		$ 28.7
Property, Plant and Equipment, Net	307		307		305
Earnings Per Share
Weighted Average Shares Outstanding - Basic	130.9	128.5	130.6	128.2
Incremental Common Shares Attributable to Share-based Payment Arrangements and Equity Forward Agreements	2.2	1.2	2.1	1.2
Weighted Average Number of Shares Outstanding, Diluted	133.1	129.7	132.7	129.4
SCE&G
Significant Accounting Policies
Power Generation Capacity Megawatts	1,117		1,117
Asset Management and Supply Service Agreements
Property, Plant and Equipment, Net	57		57		52
Genco
Significant Accounting Policies
Power Generation Capacity Megawatts	605		605
Asset Management and Supply Service Agreements
Property, Plant and Equipment, Net	$ 485		$ 485