FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional Collateral, Aggregate Fair Value	$ 117,000,000	$ 0
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	8,000,000	44,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	187,000,000	28,000,000
Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	32,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	179,000,000	20,000,000
Commodity Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,000,000	4,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	12,000,000	9,000,000
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	2,000,000	2,000,000
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	1,000,000	1,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
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	0	32,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	179,000,000	20,000,000
Fair Value, Inputs, Level 2 [Member] | 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	0
Fair Value, Inputs, Level 2 [Member] | Other energy management contracts
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	6,000,000	7,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	10,000,000	12,000,000
SCEG
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional Collateral, Aggregate Fair Value	118,600,000	0
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		32,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	159,000,000
SCEG | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	32,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	159,000,000	2,000,000
SCEG | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	0	32,000,000
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	$ 159,000,000	$ 2,000,000