FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)

12 Months Ended

Dec. 31, 2014

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

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

	As of December 31, 2014				As of December 31, 2013
Millions of dollars	Level 1		Level 2		Level 1		Level 2
Assets:
Available for sale securities	$	13	—		$	9	—
Interest rate contracts	—		—		—		$	32
Commodity contracts	1		—		2		2
Energy management contracts	—		$	20	1		7
Liabilities:
Interest rate contracts	—		257		—		20
Commodity contracts	1		11		—		—
Energy management contracts	5		18		—		12

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

	As of December 31, 2014				As of December 31, 2013
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	5,697.2	$	6,592.1	$	5,449.3	$	5,916.3

SCE&G

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

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

	As of December 31, 2014		As of December 31, 2013
Millions of dollars	Level 2		Level 2
Assets-Interest rate contracts	—		$	32
Liabilities-Interest rate contracts	$	233	2

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

	As of December 31, 2014				As of December 31, 2013
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Long-term debt	$	4,308.6	$	5,070.9	$	4,054.9	$	4,433.0