DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ (22)	$ (17)
Asset Derivatives Fair Value	114	88
Derivative Asset Fair Value Gross Amount offset in statement of financial position	(1)	(1)
Liability Derivatives Fair Value	106	123
Derivative Liability Fair Value Gross Amount Offset in the Statement of Financial Position	(1)	(1)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(22)	(17)
Collateral Already Posted, Aggregate Fair Value	60.6	78.3
Derivative Liability, Fair Value, Net	105	122
Net Fair Value Derivative Asset offset against Collateral	91	70
Net Fair Value Derivative Liability offset against Collateral	22	27
Derivative Asset, Fair Value, Net	113	87
Prepayments and other current assets [member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	66	50
Other current liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Net	67	80
Other deferred credits and other liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Net	38	42
Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	47	37
Derivatives designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	102	74
Liability Derivatives Fair Value	96	110
Derivatives not designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	12	14
Liability Derivatives Fair Value	10	13
Energy Management Contracts [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	10	13
Derivative Asset Fair Value Gross Amount offset in statement of financial position	(1)	(1)
Liability Derivatives Fair Value	10	13
Collateral Already Posted, Aggregate Fair Value	(8.0)	(11.0)
Derivative Liability, Fair Value, Net	9	12
Net Fair Value Derivative Asset offset against Collateral	9	12
Net Fair Value Derivative Liability offset against Collateral	1	1
Derivative Asset, Fair Value, Net	9	12
Interest Rate Contract
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(22)	(17)
Asset Derivatives Fair Value	100	73
Liability Derivatives Fair Value	95	106
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(22)	(17)
Collateral Already Posted, Aggregate Fair Value	(53.0)	(67.0)
Derivative Liability, Fair Value, Net	95	106
Net Fair Value Derivative Asset offset against Collateral	78	56
Net Fair Value Derivative Liability offset against Collateral	20	22
Derivative Asset, Fair Value, Net	100	73
Interest Rate Contract | Derivatives designated as hedging instruments | Prepayments and other current assets [member]
Derivative [Line Items]
Asset Derivatives Fair Value	58	42
Interest Rate Contract | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	62	70
Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	33	36
Interest Rate Contract | Derivatives designated as hedging instruments | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	42
Commodity Contract
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0
Asset Derivatives Fair Value	4	2
Liability Derivatives Fair Value	1	4
Derivative Liability Fair Value Gross Amount Offset in the Statement of Financial Position	(1)	(1)
Derivative Liability, Fair Value, Net	1	4
Net Fair Value Derivative Asset offset against Collateral	4	2
Net Fair Value Derivative Liability offset against Collateral	1	4
Derivative Asset, Fair Value, Net	4	2
Commodity Contract | Derivatives designated as hedging instruments | Prepayments and other current assets [member]
Derivative [Line Items]
Asset Derivatives Fair Value	2	1
Liability Derivatives Fair Value	1	4
Commodity Contract | Derivatives not designated as hedging instruments | Prepayments and other current assets [member]
Derivative [Line Items]
Asset Derivatives Fair Value	2	1
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Prepayments and other current assets [member]
Derivative [Line Items]
Asset Derivatives Fair Value	5	7
Liability Derivatives Fair Value		1
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	5	6
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	5
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	5	6
Liability Derivatives Fair Value		6
SCEG
Derivative [Line Items]
Collateral Already Posted, Aggregate Fair Value	22.1	35.2
Derivative Liability, Fair Value, Net	66	75
Derivative Asset, Fair Value, Net	100	73
SCEG | Prepayments and other current assets [member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	58	42
SCEG | Other current liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Net	59	66
SCEG | Other deferred credits and other liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Net	7	9
SCEG | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	42	31
SCEG | Derivatives designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	100	73
Liability Derivatives Fair Value	66	75
SCEG | Interest Rate Contract
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(22)	(17)
Asset Derivatives Fair Value	100	73
Liability Derivatives Fair Value	66	75
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(22)	(17)
Collateral Already Posted, Aggregate Fair Value	22.0	35.0
Derivative Liability, Fair Value, Net	66	75
Net Fair Value Derivative Asset offset against Collateral	78	56
Net Fair Value Derivative Liability offset against Collateral	22	23
Derivative Asset, Fair Value, Net	100	73
SCEG | Interest Rate Contract | Derivatives designated as hedging instruments | Prepayments and other current assets [member]
Derivative [Line Items]
Asset Derivatives Fair Value	58	42
SCEG | Interest Rate Contract | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	59	66
SCEG | Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	7	9
SCEG | Interest Rate Contract | Derivatives designated as hedging instruments | Other Deferred Debits and Other Assets [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	$ 42	$ 31