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AFFILIATED TRANSACTIONS - SCEG AFFILIATED TRANSACTIONS -SCEG (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012
Related Party Transaction [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 12.5	$ 5.5	$ 4.8
Related Party Transaction, Due from (to) Related Party, Current	49.4	58.5
Accounts Payable, Related Parties, Current	39.4	43.0
Equity Method Investments	10.6	13.6	5.1
Related Party Transaction, Expenses from Transactions with Related Party	305.6	302.6	269.5
Canadys Refined Coal LLC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	40.00%
Cope Refined Coal LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	111.6	123.8
Increase (Decrease) Due from Affiliates	1.8	8.5
Equity Method Investment, Dividends or Distributions	1.8	8.6
Energy Related Inventory, Coal	111.1	123.3
SCE&G
Related Party Transaction [Line Items]
Due to Affiliate, Current	124.0	136.0
SCE&G \| Canadys Refined Coal LLC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage			10.00%
CGT [Member]
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party	35.9	30.8	32.0
Due to Affiliate, Current	3.4	2.5
Retail Gas Marketing and Energy Marketing
Related Party Transaction [Line Items]
Due to Affiliate, Current		13.2		13.1
Cost of Natural Gas Purchases	$ 125.5	$ 187.4	$ 182.5