Cost of natural gas purchased and associated transportation and storage costs during the period.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of transactions with related party during the financial reporting period.

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AFFILIATED TRANSACTIONS -SCEG (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 65.9	$ 82.0	$ 185.1	$ 190.9
Due to Affiliate, Current	21.8		21.8		$ 27.9
Due from Affiliate, Current	$ 21.6		$ 21.6		27.8
Equity Method Investment, Ownership Percentage	40.00%		40.00%
CGT [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party		6.9	$ 3.4	21.6
Due to Affiliate, Current					3.3
Due from Affiliate, Current		0.0		0.0	1.2
Energy Marketing [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	$ 9.6		9.6		12.6
Cost of Natural Gas Purchases	34.0	46.8	101.4	154.1
Canadys Refined Coal [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	66.3	82.4	186.0	191.9
SCANA Services [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	37.2		37.2		$ 47.3
Related Party Transaction, Expenses from Transactions with Related Party	$ 80.8	$ 65.0	$ 226.0	$ 211.4