DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	$ 74	$ 3
Liability Derivatives Fair Value	110	172
Derivatives not designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	14	27
Liability Derivatives Fair Value	13	25
Interest Rate Contract | Derivatives designated as hedging instruments | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	42	2
Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred debits and other assets
Derivative [Line Items]
Asset Derivatives Fair Value	31
Interest Rate Contract | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	70	55
Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	36	103
Commodity contracts | Derivatives designated as hedging instruments | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	1
Liability Derivatives Fair Value		1
Commodity contracts | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Asset Derivatives Fair Value		1
Liability Derivatives Fair Value	4	10
Commodity contracts | Derivatives designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value		3
Commodity contracts | Derivatives not designated as hedging instruments | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	1
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	7	17
Liability Derivatives Fair Value	1	3
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other deferred debits and other assets
Derivative [Line Items]
Asset Derivatives Fair Value	6	10
Liability Derivatives Fair Value	6
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	6	13
Other Energy Management Contract [Member] | Derivatives not designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value		9
SCE&G | Derivatives designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	73	1
Liability Derivatives Fair Value	75	77
SCE&G | Interest Rate Contract | Derivatives designated as hedging instruments | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	42	1
SCE&G | Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred debits and other assets
Derivative [Line Items]
Asset Derivatives Fair Value	31
SCE&G | Interest Rate Contract | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	66	2
SCE&G | Interest Rate Contract | Derivatives designated as hedging instruments | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	$ 9	$ 75