EMPLOYEE BENEFIT PLANS (Details) - USD ($)	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2013	Aug. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation				$ 829,300,000	$ 888,300,000
Defined Benefit Plan Health Care Cost Trend Rate, Assumed				7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				5.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation				$ 800,000	1,300,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation				700,000	1,000,000
Defined Benefit Plan, Fair Value of Plan Assets				$ 782,000,000	$ 862,000,000
Transfers of fair value amounts into or out of Levels 1, 2 or 3				no	no
Defined Contribution Plan, Cost Recognized				$ 26,200,000	$ 25,800,000	$ 23,400,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Adoption of new mortality tables in 2014, gain					3,000,000
Adoption of modified mortality tables in 2015, gain				2,400,000.0
Defined Benefit Plan, Benefit Obligation	$ 238,000,000			253,600,000	268,200,000	238,000,000
Service cost				5,300,000	4,600,000	5,900,000
Interest cost				11,400,000	12,000,000	$ 11,100,000
Defined Benefit Plan, Contributions by Plan Participants				2,400,000	2,200,000
Defined Benefit Plan, Actuarial Net (Gains) Losses				21,200,000	(23,500,000)
Defined Benefit Plan, Benefits Paid				$ (12,500,000)	$ (12,100,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				4.78%	4.30%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase				3.00%	3.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				5.00%	5.00%	5.00%
Defined Benefit Plan, Fair Value of Plan Assets				$ 0	$ 0
Defined Benefit Plan, Funded Status of Plan				(253,600,000)	(268,200,000)
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities				(11,900,000)	(11,200,000)
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent				(241,700,000)	(257,000,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax				1,700,000	3,000,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax				0	100,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax				1,700,000	3,100,000
pension and other postretirement benefit plans, regulated assets, net gains, before tax				24,000,000	43,800,000
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax				300,000	600,000
Pension and other postretirement benefit plans, regulatory assets, before tax				24,300,000	44,400,000
Defined Benefit Plan, Shared Costs Deferred				13.8	15.1
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax				$ (18,000,000)	$ 19,400,000	$ (29,900,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate				4.30%	5.19%	4.19%
Defined Benefit Plan, Amortization of Transition Obligations (Assets)				$ 0	$ 0	$ 300,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase				3.00%	3.75%	3.75%
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax				$ (1,800,000)	$ 0	$ (2,700,000)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax				(300,000)	(300,000)	(600,000)
Regulatory assets, prior service cost (credit), pension and other postretirement benefit plans, net of tax				0	0	0
Regulatory assets, amortization of transition obligation, pension and other postretirement benefit plans, net of tax				0	0	(200,000)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax				(20,100,000)	(19,100,000)	(33,400,000)
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Adoption of new mortality tables in 2014, gain					26,000,000
Adoption of modified mortality tables in 2015, gain				21,500,000.0
Defined Benefit Plan, Benefit Obligation	823,000,000			855,400,000	919,500,000	823,000,000
Service cost				24,100,000	20,000,000	21,800,000
Interest cost				38,200,000	40,400,000	38,500,000
Defined Benefit Plan, Contributions by Plan Participants				0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses				62,400,000	(100,100,000)
Defined Benefit Plan, Benefits Paid				(64,000,000)	(64,000,000)
Defined Benefit Plan, Curtailments				$ 0	$ 0	9,900,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				4.68%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase				3.00%	3.00%
Defined Benefit Plan, Fair Value of Plan Assets	$ 870,000,000			$ 781,700,000	$ 861,800,000	870,000,000
Defined Benefit Plan, Funded Status of Plan				(73,700,000)	(57,700,000)
Defined Benefit Pension Plan, Liabilities, Noncurrent				(73,700,000)	(57,700,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax				10,400,000	8,100,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax				200,000	300,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax				10,600,000	8,400,000
pension and other postretirement benefit plans, regulated assets, net gains, before tax				219,400,000	222,100,000
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax				5,900,000	9,600,000
Pension and other postretirement benefit plans, regulatory assets, before tax				225,300,000	231,700,000
Defined Benefit Plan, Shared Costs Deferred				20.3	17.8
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax				$ 9,200,000	$ 101,300,000	(157,500,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.07%	4.10%		4.20%	5.03%
Expected return on assets				$ (62,000,000)	$ (66,700,000)	(61,400,000)
Defined Benefit Plan, Amortization of Transition Obligations (Assets)				0	0	0
Defined Benefit Plan, Actual Return on Plan Assets				$ (16,100,000)	$ 55,800,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%	3.75%		3.00%	3.00%
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax				$ (11,900,000)	$ (4,000,000)	(14,700,000)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax				(3,700,000)	(3,200,000)	(5,200,000)
Regulatory assets, prior service cost (credit), pension and other postretirement benefit plans, net of tax				0	0	(8,900,000)
Regulatory assets, amortization of transition obligation, pension and other postretirement benefit plans, net of tax				0	0	0
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax				$ (6,400,000)	(94,100,000)	(186,300,000)
SCE&G
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Period for which Annual Base Earnings are Considered Under Average Pay Formula				3
Defined Benefit Plan, Accumulated Benefit Obligation				$ 0	0
Defined Benefit Plan Health Care Cost Trend Rate, Assumed				7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				5.00%
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation				$ 0	0
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation				0	0
Defined Benefit Plan, Fair Value of Plan Assets				$ 720,000,000	$ 784,000,000
Transfers of fair value amounts into or out of Levels 1, 2 or 3				no	no
Defined Contribution Plan, Cost Recognized				$ 21,800,000	$ 20,700,000	18,700,000
SCE&G | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Adoption of new mortality tables in 2014, gain					2,000,000
Adoption of modified mortality tables in 2015, gain				2,000,000.0
Defined Benefit Plan, Benefit Obligation	$ 181,700,000			191,700,000	204,100,000	181,700,000
Service cost				4,400,000	3,600,000	4,600,000
Interest cost				9,400,000	9,400,000	$ 8,700,000
Defined Benefit Plan, Contributions by Plan Participants				1,900,000	1,800,000
Defined Benefit Plan, Actuarial Net (Gains) Losses				15,700,000	(18,600,000)
Defined Benefit Plan, Benefits Paid				$ (10,300,000)	$ (9,600,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				4.78%	4.30%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase				3.00%	3.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				5.00%	5.00%	5.00%
Defined Benefit Plan, Fair Value of Plan Assets				$ 0	$ 0
Defined Benefit Plan, Funded Status of Plan				(191,700,000)	(204,100,000)
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities				(9,800,000)	(8,500,000)
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent				0	0
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent				(181,900,000)	(195,600,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax				700,000	1,000,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax				0	0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax				700,000	1,000,000
pension and other postretirement benefit plans, regulated assets, net gains, before tax				20,400,000	35,900,000
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax				200,000	500,000
Pension and other postretirement benefit plans, regulatory assets, before tax				20,600,000	36,400,000
Defined Benefit Plan, Shared Costs Deferred				13.8	15.1
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax				$ (14,000,000)	$ 15,800,000	$ (24,400,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate				4.30%	5.19%	4.19%
Defined Benefit Plan, Amounts Funded to Parent				$ (2,100,000)	$ (1,400,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase				3.00%	3.75%	3.75%
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax				$ (1,500,000)	$ 0	$ (2,200,000)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax				(300,000)	(200,000)	(500,000)
Regulatory assets, prior service cost (credit), pension and other postretirement benefit plans, net of tax				0	0	0
Regulatory assets, amortization of transition obligation, pension and other postretirement benefit plans, net of tax				0	0	(100,000)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax				(15,800,000)	(15,600,000)	(27,200,000)
SCE&G | Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Adoption of new mortality tables in 2014, gain					22,000,000
Adoption of modified mortality tables in 2015, gain				18,200,000.0
Defined Benefit Plan, Benefit Obligation	695,700,000			724,000,000	773,700,000	695,700,000
Service cost				19,300,000	16,000,000	17,600,000
Interest cost				32,200,000	34,100,000	32,600,000
Defined Benefit Plan, Contributions by Plan Participants				0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses				47,000,000	(82,700,000)
Defined Benefit Plan, Benefits Paid				(54,200,000)	(54,800,000)
Defined Benefit Plan, Curtailments				$ 0	$ 0	8,400,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				4.68%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase				3.00%	3.00%
Defined Benefit Plan, Fair Value of Plan Assets	$ 792,100,000			$ 720,100,000	$ 783,600,000	792,100,000
Defined Benefit Plan, Funded Status of Plan				(3,900,000)	9,900,000
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent				0	9,900,000
Defined Benefit Pension Plan, Liabilities, Noncurrent					0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax				2,000,000	1,900,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax				0	100,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax				2,000,000	2,000,000
pension and other postretirement benefit plans, regulated assets, net gains, before tax				193,700,000	191,900,000
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax				5,200,000	8,300,000
Pension and other postretirement benefit plans, regulatory assets, before tax				198,900,000	200,200,000
Defined Benefit Plan, Shared Costs Deferred				20.3	17.8
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax				$ 12,200,000	$ 87,700,000	(137,100,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.07%	4.10%		4.20%	5.03%
Defined Benefit Plan, Amounts Funded to Parent				$ 0	$ 0
Expected return on assets				(52,200,000)	(56,300,000)	(51,900,000)
Defined Benefit Plan, Actual Return on Plan Assets				$ (9,300,000)	$ 46,300,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%	3.75%		3.00%	3.00%
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax				$ (10,400,000)	$ (3,500,000)	(12,700,000)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax				(3,100,000)	(2,800,000)	(4,500,000)
Regulatory assets, prior service cost (credit), pension and other postretirement benefit plans, net of tax				0	0	(7,700,000)
Regulatory assets, amortization of transition obligation, pension and other postretirement benefit plans, net of tax				0	0	0
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax				(1,300,000)	$ (81,400,000)	(162,000,000)
Pension Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority	$ 63,000,000			14,000,000		63,000,000
Pension Costs [Member] | SCE&G
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority	$ 63,000,000			$ 14,000,000		$ 63,000,000
Regulatory assets, expected recovery period (in years)				12 years		14 years
Scenario, Forecast [Member] | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, future amortization of gain or loss from regulatory assets			$ 300,000
Defined benefit plan, future amortization of prior service cost (credit) from regulatory assets			300,000
Defined benefit plan, amount to be amortized from regulatory assets next year			600,000
Scenario, Forecast [Member] | Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, future amortization of gain or loss from regulatory assets			12,700,000
Defined benefit plan, future amortization of prior service cost (credit) from regulatory assets			3,400,000
Defined benefit plan, amount to be amortized from regulatory assets next year			$ 16,100,000
Scenario, Forecast [Member] | SCE&G
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year			insignificant
Scenario, Forecast [Member] | SCE&G | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, future amortization of gain or loss from regulatory assets			$ 300,000
Defined benefit plan, future amortization of prior service cost (credit) from regulatory assets			200,000
Defined benefit plan, amount to be amortized from regulatory assets next year			500,000
Scenario, Forecast [Member] | SCE&G | Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, future amortization of gain or loss from regulatory assets			11,200,000
Defined benefit plan, future amortization of prior service cost (credit) from regulatory assets			3,000,000
Defined benefit plan, amount to be amortized from regulatory assets next year			$ 14,200,000