FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, 2016						As of December 31, 2015
	The Company				Consolidated SCE&G		The Company				Consolidated SCE&G
Millions of dollars	Level 1		Level 2		Level 2		Level 1		Level 2		Level 2
Assets:
Available for sale securities	$	13	—		—		$	11	—		—
Held to maturity securities	—		$	7	—		—		—		—
Interest rate contracts	—		—		—		—		$	15	$	15
Commodity contracts	9		—		—		1		—		—
Energy management contracts	2		7		—		—		14		—
Liabilities:
Interest rate contracts	—		237		$	210	—		87		65
Commodity contracts	—		—		—		1		4		—
Energy management contracts	—		11		—		4		12		—

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:

Long-Term Debt	June 30, 2016				December 31, 2015
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
The Company	$	6,584.4	$	7,633.0	$	5,997.6	$	6,445.7
Consolidated SCE&G	$	5,260.4	$	6,127.6	$	4,769.0	$	5,129.1

SCEG [member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, 2016						As of December 31, 2015
	The Company				Consolidated SCE&G		The Company				Consolidated SCE&G
Millions of dollars	Level 1		Level 2		Level 2		Level 1		Level 2		Level 2
Assets:
Available for sale securities	$	13	—		—		$	11	—		—
Held to maturity securities	—		$	7	—		—		—		—
Interest rate contracts	—		—		—		—		$	15	$	15
Commodity contracts	9		—		—		1		—		—
Energy management contracts	2		7		—		—		14		—
Liabilities:
Interest rate contracts	—		237		$	210	—		87		65
Commodity contracts	—		—		—		1		4		—
Energy management contracts	—		11		—		4		12		—

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:

Long-Term Debt	June 30, 2016				December 31, 2015
Millions of dollars	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
The Company	$	6,584.4	$	7,633.0	$	5,997.6	$	6,445.7
Consolidated SCE&G	$	5,260.4	$	6,127.6	$	4,769.0	$	5,129.1