FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

Fair value measurements, and the level within the fair value hierarchyin which the measurements fall, were as follows:

		Fair Value Measurements Using
		Quoted Prices in
		Active Markets for		Significant Other
		Identical Assets		Observable Inputs
Millions of dollars		(Level 1)		(Level 2)
As of September 30, 2013
Assets -	Available for sale securities	$	9	—
	Interest rate contracts	—		$	124
	Commodity contracts	1		—
	Energy management contracts	—		10
Liabilities -	Interest rate contracts	—		24
	Commodity contracts	—		3
	Energy management contracts	—		13
As of December 31, 2012
Assets -	Available for sale securities	$	6	—
	Interest rate contracts	—		$	73
	Commodity contracts	1		1
	Energy management contracts	—		13
Liabilities -	Interest rate contracts	—		106
	Commodity contracts	—		4
	Energy management contracts	1		15

Fair Value, by Balance Sheet Grouping [Table Text Block]

Financial instruments for which the carrying amount may not equal estimated fair value at September 30, 2013 and December 31, 2012 were as follows:

	September 30, 2013				December 31, 2012
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	5,450.9	$	5,936.7	$	5,121.0	$	6,115.0

SCEG

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

Fair value measurements based on significant other observable inputs (level 2) were as follows: 

		Fair Value Measurements Using Significant
		Other Observable Inputs (Level 2)
Millions of dollars		September 30, 2013		December 31, 2012
Assets -	Interest rate contracts	$	124	$	73
Liabilities -	Interest rate contracts	3		75

Fair Value, by Balance Sheet Grouping [Table Text Block]

Financial instruments for which the carrying amount may not equal estimated fair value at September 30, 2013 and December 31, 2012 were as follows:

	September 30, 2013				December 31, 2012
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	4,056.4	$	4,454.4	$	3,722.0	$	4,543.1