FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)

6 Months Ended

Jun. 30, 2015

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

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

	As of June 30, 2015				As of December 31, 2014
Millions of dollars	Level 1		Level 2		Level 1		Level 2
Assets:
Available for sale securities	$	14	—		$	13	—
Interest rate contracts	—		$	41	—		—
Commodity contracts	3		—		1		—
Energy management contracts	—		13		—		$	20
Liabilities:
Interest rate contracts	—		115		—		257
Commodity contracts	—		3		1		11
Energy management contracts	1		15		5		18

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

Financial instruments for which the carrying amount may not equal estimated fair value were as follows:

	June 30, 2015				December 31, 2014
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	6,034.2	$	6,525.2	$	5,697.2	$	6,592.1

SCEG

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

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Fair value Level 2 measurements were as follows:

Millions of dollars		June 30, 2015		December 31, 2014
Assets -	Interest rate contracts	$	41	—
Liabilities -	Interest rate contracts	94		$	233

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

Financial instruments for which the carrying amount may not equal estimated fair value were as follows:

	June 30, 2015				December 31, 2014
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	4,800.6	$	5,191.5	$	4,308.6	$	5,070.9