EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

The measurement date used to determine pension and other postretirement benefit obligations is December 31. Data related to the changes in the projected benefit obligation for pension benefits and the accumulated benefit obligation for other postretirement benefits are presented below.

	Pension Benefits						Other Postretirement Benefits
Millions of dollars	2015			2014			2015			2014
Benefit obligation, January 1	$	919.5		$	823.0		$	268.2		$	238.0
Service cost	24.1			20.0			5.3			4.6
Interest cost	38.2			40.4			11.4			12.0
Plan participants’ contributions	—			—			2.4			2.2
Actuarial (gain) loss	(62.4		)	100.1			(21.2		)	23.5
Benefits paid	(64.0		)	(64.0		)	(12.5		)	(12.1		)
Benefit obligation, December 31	$	855.4		$	919.5		$	253.6		$	268.2

Schedule of Assumptions Used to Determine Benefit Obligations [Table Text Block]

Significant assumptions used to determine the above benefit obligations are as follows:

	Pension Benefits				Other Postretirement Benefits
	2015		2014		2015		2014
Annual discount rate used to determine benefit obligation	4.68	%	4.20	%	4.78	%	4.30	%
Assumed annual rate of future salary increases for projected benefit obligation	3.00	%	3.00	%	3.00	%	3.00	%

Schedule of Net Funded Status [Table Text Block]

Millions of Dollars	Pension Benefits						Other Postretirement Benefits
December 31,	2015			2014			2015			2014
Fair value of plan assets	$	781.7		$	861.8		—			—
Benefit obligation	855.4			919.5			$	253.6		$	268.2
Funded status	$	(73.7	)	$	(57.7	)	$	(253.6	)	$	(268.2	)

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized on the consolidated balance sheets were as follows:

Millions of Dollars	Pension Benefits						Other Postretirement Benefits
December 31,	2015			2014			2015			2014
Current liability	—			—			$	(11.9	)	$	(11.2	)
Noncurrent liability	$	(73.7	)	$	(57.7	)	(241.7		)	(257.0		)

Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Amounts recognized in accumulated other comprehensive loss were as follows:

Millions of Dollars	Pension Benefits				Other Postretirement Benefits
December 31,	2015		2014		2015		2014
Net actuarial loss	$	10.4	$	8.1	$	1.7	$	3.0
Prior service cost	0.2		0.3		—		0.1
Total	$	10.6	$	8.4	$	1.7	$	3.1

Schedule of defined benefit plan, amounts recognized in regulatory assets [Table Text Block]

Amounts recognized in regulatory assets were as follows:

Millions of Dollars	Pension Benefits				Other Postretirement Benefits
December 31,	2015		2014		2015		2014
Net actuarial loss	$	219.4	$	222.1	$	24.0	$	43.8
Prior service cost	5.9		9.6		0.3		0.6
Total	$	225.3	$	231.7	$	24.3	$	44.4

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

	Pension Benefits
Millions of dollars	2015			2014
Fair value of plan assets, January 1	$	861.8		$	870.0
Actual return (loss) on plan assets	(16.1		)	55.8
Benefits paid	(64.0		)	(64.0		)
Fair value of plan assets, December 31	$	781.7		$	861.8

Schedule of Allocation of Plan Assets [Table Text Block]

The Company’s pension plan asset allocation at December 31, 2015 and 2014 and the target allocation for 2016 are as follows: 

	Percentage of Plan Assets
	Target Allocation		December 31,
Asset Category	2016		2015		2014
Equity Securities	58	%	57	%	57	%
Fixed Income	33	%	32	%	34	%
Hedge Funds	9	%	11	%	9	%

Schedule of Fair Value of Plan, Assets by Measurement Levels [Table Text Block]

	Fair Value Measurements at Reporting Date Using
Millions of dollars	Total		Level 2		Level 3		Total		Level 2		Level 3
	December 31, 2015						December 31, 2014
Mutual funds	$	538	$	538	—		$	622	$	622	—
Short-term investment vehicles	14		14		—		20		20		—
US Treasury securities	22		22		—		6		6		—
Corporate debt securities	78		78		—		86		86		—
Municipals	14		14		—		15		15		—
Limited partnerships	33		33		—		32		32		—
Multi‑strategy hedge funds	83		—		$	83	81		—		$	81
	$	782	$	699	$	83	$	862	$	781	$	81

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

	Fair Value Measurements Level 3
Millions of dollars	2015		2014
Beginning Balance	$	81	$	76
Unrealized gains included in changes in net assets	2		5
Purchases, issuances, and settlements	—		—
Ending Balance	$	83	$	81

Schedule of Expected Benefit Payments [Table Text Block]

Millions of dollars	Pension Benefits		Other Postretirement Benefits
2016	$	65.1	$	11.9
2017	63.2		12.7
2018	64.7		13.5
2019	65.3		14.2
2020	65.8		14.9
2021-2025	338.3		80.5

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015		2014		2013
Service cost	$	24.1		$	20.0		$	21.8		$	5.3	$	4.6	$	5.9
Interest cost	38.2			40.4			38.5			11.4		12.0		11.1
Expected return on assets	(62.0		)	(66.7		)	(61.4		)	n/a		n/a		n/a
Prior service cost amortization	4.1			4.1			6.0			0.4		0.3		0.7
Amortization of actuarial losses	13.6			4.8			16.9			2.1		—		3.3
Transition obligation amortization	—			—			—			—		—		0.3
Curtailment	—			—			9.9			—		—		—
Net periodic benefit cost	$	18.0		$	2.6		$	31.7		$	19.2	$	16.9	$	21.3

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other changes in plan assets and benefit obligations recognized in OCI (net of tax) were as follows:

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015			2014		2013
Current year actuarial (gain) loss	$	2.7		$	3.1		$	(5.0	)	$	(1.2	)	$	1.3	$	(1.8	)
Amortization of actuarial losses	(0.4		)	(0.2		)	(0.5		)	(0.1		)	—		(0.2		)
Amortization of prior service cost	(0.1		)	(0.2		)	(0.2		)	(0.1		)	—		—
Prior service cost (credit)	—			—			(0.3		)	—			—		—
Amortization of transition obligation	—			—			—			—			—		(0.1		)
Total recognized in OCI	$	2.2		$	2.7		$	(6.0	)	$	(1.4	)	$	1.3	$	(2.1	)

Schedule of defined benefit plan, Other changes in plan assets recognized in regulatory assets [Table Text Block]

Other changes in plan assets and benefit obligations recognized in regulatory assets were as follows:

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015			2014			2013
Current year actuarial (gain) loss	$	9.2		$	101.3		$	(157.5	)	$	(18.0	)	$	19.4		$	(29.9	)
Amortization of actuarial losses	(11.9		)	(4.0		)	(14.7		)	(1.8		)	—			(2.7		)
Amortization of prior service cost	(3.7		)	(3.2		)	(5.2		)	(0.3		)	(0.3		)	(0.6		)
Prior service cost (credit)	—			—			(8.9		)	—			—			—
Amortization of transition obligation	—			—			—			—			—			(0.2		)
Total recognized in regulatory assets	$	(6.4	)	$	94.1		$	(186.3	)	$	(20.1	)	$	19.1		$	(33.4	)

Schedule of Assumptions Used in Determining Net Periodic Benefit Cost [Table Text Block]

	Pension Benefits						Other Postretirement Benefits
	2015		2014		2013		2015		2014		2013
Discount rate	4.20	%	5.03	%	4.10%/5.07%		4.30	%	5.19	%	4.19	%
Expected return on plan assets	7.50	%	8.00	%	8.00	%	n/a		n/a		n/a
Rate of compensation increase	3.00	%	3.00	%	3.75%/3.00%		3.00	%	3.75	%	3.75	%
Health care cost trend rate	n/a		n/a		n/a		7.00	%	7.40	%	7.80	%
Ultimate health care cost trend rate	n/a		n/a		n/a		5.00	%	5.00	%	5.00	%
Year achieved	n/a		n/a		n/a		2020		2020		2020

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2016 are as follows:

Millions of Dollars	Pension Benefits		Other Postretirement Benefits
Actuarial loss	$	0.6	—
Prior service cost	0.2		—
Total	$	0.8	—

Schedule of amounts in regulatory assets to be recognized over the next fiscal year [Table Text Block]

The estimated amounts to be amortized from regulatory assets into net periodic benefit cost in 2016 are as follows:

Millions of Dollars	Pension Benefits		Other Postretirement Benefits
Actuarial loss	$	12.7	$	0.3
Prior service cost	3.4		0.3
Total	$	16.1	$	0.6

SCE&G

Defined Benefit Plan Disclosure [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

	Pension Benefits						Other Postretirement Benefits
Millions of dollars	2015			2014			2015			2014
Benefit obligation, January 1	$	773.7		$	695.7		$	204.1		$	181.7
Service cost	19.3			16.0			4.4			3.6
Interest cost	32.2			34.1			9.4			9.4
Plan participants’ contributions	—			—			1.9			1.8
Actuarial (gain) loss	(47.0		)	82.7			(15.7		)	18.6
Benefits paid	(54.2		)	(54.8		)	(10.3		)	(9.6		)
Amounts funded to parent	—			—			(2.1		)	(1.4		)
Benefit obligation, December 31	$	724.0		$	773.7		$	191.7		$	204.1

Schedule of Assumptions Used to Determine Benefit Obligations [Table Text Block]

Significant assumptions used to determine the above benefit obligations are as follows: 

	Pension Benefits				Other Postretirement Benefits
	2015		2014		2015		2014
Annual discount rate used to determine benefit obligation	4.68	%	4.20	%	4.78	%	4.30	%
Assumed annual rate of future salary increases for projected benefit obligation	3.00	%	3.00	%	3.00	%	3.00	%

Schedule of Net Funded Status [Table Text Block]

Funded Status

Millions of Dollars	Pension Benefits					Other Postretirement Benefits
December 31,	2015			2014		2015			2014
Fair value of plan assets	$	720.1		$	783.6	—			—
Benefit obligation	724.0			773.7		$	191.7		$	204.1
Funded status	$	(3.9	)	$	9.9	$	(191.7	)	$	(204.1	)

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Amounts recognized on the consolidated balance sheets were as follows:

Millions of Dollars	Pension Benefits					Other Postretirement Benefits
December 31,	2015			2014		2015			2014
Current liability	—			—		$	(9.8	)	$	(8.5	)
Noncurrent asset	—			$	9.9	—			—
Noncurrent liability	$	(3.9	)	—		(181.9		)	(195.6		)

Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Amounts recognized in accumulated other comprehensive loss were as follows:

Millions of Dollars	Pension Benefits				Other Postretirement Benefits
December 31,	2015		2014		2015		2014
Net actuarial loss	$	2.0	$	1.9	$	0.7	$	1.0
Prior service cost	—		0.1		—		—
Total	$	2.0	$	2.0	$	0.7	$	1.0

Schedule of defined benefit plan, amounts recognized in regulatory assets [Table Text Block]

Amounts recognized in regulatory assets were as follows:

Millions of Dollars	Pension Benefits				Other Postretirement Benefits
December 31,	2015		2014		2015		2014
Net actuarial loss	$	193.7	$	191.9	$	20.4	$	35.9
Prior service cost	5.2		8.3		0.2		0.5
Total	$	198.9	$	200.2	$	20.6	$	36.4

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

Changes in Fair Value of Plan Assets

	Pension Benefits
Millions of dollars	2015			2014
Fair value of plan assets, January 1	$	783.6		$	792.1
Actual return (loss) on plan assets	(9.3		)	46.3
Benefits paid	(54.2		)	(54.8		)
Fair value of plan assets, December 31	$	720.1		$	783.6

Schedule of Allocation of Plan Assets [Table Text Block]

The pension plan asset allocation at December 31, 2015 and 2014 and the target allocation for 2016 are as follows:

	Percentage of Plan Assets
	Target Allocation		December 31,
Asset Category	2016		2015		2014
Equity Securities	58	%	57	%	57	%
Fixed Income	33	%	32	%	34	%
Hedge Funds	9	%	11	%	9	%

Schedule of Fair Value of Plan, Assets by Measurement Levels [Table Text Block]

	Fair Value Measurements at Reporting Date Using
Millions of dollars	Total		Level 2		Level 3		Total		Level 2		Level 3
	December 31, 2015						December 31, 2014
Mutual funds	$	496	$	496	—		$	566	$	566	—
Short-term investment vehicles	12		12		—		18		18		—
US Treasury securities	20		20		—		6		6		—
Corporate debt securities	72		72		—		78		78		—
Municipals	13		13		—		14		14		—
Limited partnerships	30		30		—		29		29		—
Multi-strategy hedge funds	77		—		$	77	73		—		$	73
	$	720	$	643	$	77	$	784	$	711	$	73

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

	Fair Value Measurements Level 3
Millions of dollars	2015		2014
Beginning Balance	$	73	$	69
Unrealized gains included in changes in net assets	4		4
Purchases, issuances, and settlements	—		—
Ending Balance	$	77	$	73

Schedule of Expected Benefit Payments [Table Text Block]

The total benefits expected to be paid from the pension plan or from Consolidated SCE&G’s assets for the other postretirement benefits plan (net of participant contributions), respectively, are as follows:

Expected Benefit Payments

Millions of dollars	Pension Benefits		Other Postretirement Benefits
2016	$	65.1	$	9.8
2017	63.2		10.5
2018	64.7		11.1
2019	65.3		11.7
2020	65.8		12.3
2021 - 2025	338.3		66.1

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Benefit Cost

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015		2014		2013
Service cost	$	19.3		$	16.0		$	17.6		$	4.4	$	3.6	$	4.6
Interest cost	32.2			34.1			32.6			9.4		9.4		8.7
Expected return on assets	(52.2		)	(56.3		)	(51.9		)	n/a		n/a		n/a
Prior service cost amortization	3.4			3.5			5.0			0.3		0.3		0.6
Amortization of actuarial losses	11.4			4.0			14.3			1.7		—		2.6
Curtailment	—			—			8.4			—		—		—
Net periodic benefit cost	$	14.1		$	1.3		$	26.0		$	15.8	$	13.3	$	16.5

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other changes in plan assets and benefit obligations recognized in OCI (net of tax) were as follows:

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015			2014		2013
Current year actuarial (gain) loss	$	0.2		$	0.2		$	(0.8	)	$	(0.3	)	$	0.4	$	(0.4	)
Amortization of actuarial losses	(0.1		)	(0.1		)	(0.1		)	—			—		(0.1		)
Amortization of prior service cost	(0.1		)	(0.1		)	—			—			—		—
Total recognized in OCI	$	—		$	—		$	(0.9	)	$	(0.3	)	$	0.4	$	(0.5	)

Schedule of defined benefit plan, Other changes in plan assets recognized in regulatory assets [Table Text Block]

Other changes in plan assets and benefit obligations recognized in regulatory assets were as follows:

	Pension Benefits									Other Postretirement Benefits
Millions of dollars	2015			2014			2013			2015			2014			2013
Current year actuarial (gain) loss	$	12.2		$	87.7		$	(137.1	)	$	(14.0	)	$	15.8		$	(24.4	)
Amortization of actuarial losses	(10.4		)	(3.5		)	(12.7		)	(1.5		)	—			(2.2		)
Amortization of prior service cost	(3.1		)	(2.8		)	(4.5		)	(0.3		)	(0.2		)	(0.5		)
Prior service cost (credit)	—			—			(7.7		)	—			—			—
Amortization of transition obligation	—			—			—			—			—			(0.1		)
Total recognized in regulatory assets	$	(1.3	)	$	81.4		$	(162.0	)	$	(15.8	)	$	15.6		$	(27.2	)

Schedule of Assumptions Used in Determining Net Periodic Benefit Cost [Table Text Block]

Significant Assumptions Used in Determining Net Periodic Benefit Cost

	Pension Benefits						Other Postretirement Benefits
	2015		2014		2013		2015		2014		2013
Discount rate	4.20	%	5.03	%	4.10%/5.07%		4.30	%	5.19	%	4.19	%
Expected return on plan assets	7.50	%	8.00	%	8.00	%	n/a		n/a		n/a
Rate of compensation increase	3.00	%	3.00	%	3.75%/3.00%		3.00	%	3.75	%	3.75	%
Health care cost trend rate	n/a		n/a		n/a		7.00	%	7.40	%	7.80	%
Ultimate health care cost trend rate	n/a		n/a		n/a		5.00	%	5.00	%	5.00	%
Year achieved	n/a		n/a		n/a		2020		2020		2020

Schedule of amounts in regulatory assets to be recognized over the next fiscal year [Table Text Block]

The estimated amounts to be amortized from regulatory assets into net periodic benefit cost in 2016 are as follows:

Millions of Dollars	Pension Benefits		Other Postretirement Benefits
Actuarial loss	$	11.2	$	0.3
Prior service cost	3.0		0.2
Total	$	14.2	$	0.5