FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	$ 135,000,000	$ 87,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	37,000,000	122,000,000
Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	124,000,000	73,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	24,000,000	106,000,000
Commodity Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,000,000	2,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	3,000,000	4,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	9,000,000	6,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	1,000,000	1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other energy management contracts
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	1,000,000
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	124,000,000	73,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	24,000,000	106,000,000
Fair Value, Inputs, Level 2 [Member] | Commodity Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	3,000,000	4,000,000
Fair Value, Inputs, Level 2 [Member] | Other energy management contracts
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	10,000,000	13,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	13,000,000	15,000,000
SCEG
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	124,000,000	73,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	3,000,000	75,000,000
SCEG | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	124,000,000	73,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	3,000,000	75,000,000
SCEG | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	124	73
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	$ 3	$ 75