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Amount for accounts payable to related parties. 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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Cost of natural gas purchased and associated transportation and storage costs during the period.

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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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- Definition

Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel.

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- Definition

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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The increase (decrease) during the reporting period in receivables to be collected from an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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The increase (decrease) during the reporting period in the obligations due for goods and services provided by the following types of related parties: a parent company and its subsidiaries, subsidiaries of a common parent, an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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AFFILIATED TRANSACTIONS - SCEG AFFILIATED TRANSACTIONS -SCEG (Details) (USD $) In Millions, unless otherwise specified				6 Months Ended	12 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Canadys Refined Coal LLC [Member]	Jun. 30, 2012 Cope Refined Coal LLC [Member]	Dec. 31, 2011 Cope Refined Coal LLC [Member]	Jun. 30, 2011 Cope Refined Coal LLC [Member]	Jun. 30, 2012 CGT [Member]	Jun. 30, 2011 CGT [Member]	Jun. 30, 2012 Retail Gas Marketing and Energy Marketing	Jun. 30, 2011 Retail Gas Marketing and Energy Marketing	Dec. 31, 2011 Retail Gas Marketing and Energy Marketing
Related Party Transaction [Line Items]
Related Party Transaction Purchases from Related Party				$ 46.9	$ 53.3		$ 18.5	$ 15.8
Due to Affiliate, Current							2.6	2.5	10.0		13.2
Equity Method Investment, Ownership Percentage			40.00%	10.00%
Increase (Decrease) Due from Affiliates				6.4	8.5
Cost of Natural Gas Purchases									48.8	96.7
Equity Method Investment, Dividends or Distributions				6.4	8.6
Energy Related Inventory, Coal				46.6		53.1
Related Party Transaction, Due from (to) Related Party, Current	70.1	58.5
Accounts Payable, Related Parties, Current	$ 28	$ 43