EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		$ 71.7
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description		no
Defined Benefit Plan, Accumulated Benefit Obligation		$ 842.4	$ 905.8
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		$ 0.7	1.6
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation		0.6	1.4
Defined Benefit Plan, Plan Assets, Amount		727.3	849.6	$ 793.6
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		(50.6)	128.4
Defined Benefit Plan, Shared Costs Deferred		$ 24.9	$ 21.4
Defined Benefit Plan Health Care Cost Trend Rate, Assumed		6.60%
Defined Benefit Plan, Target Allocation, Equity Securities		55.00%	58.00%
Defined Benefit Plan, Target Plan Asset Allocations		34.00%	31.00%
Defined Benefit Plan, Target Plan Asset Allocation, Hedge Funds		11.00%	11.00%
Defined Benefit Plan, Benefit Obligation, Benefits Paid			$ 72.4
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid			12.5
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		$ 1.4	1.3
Defined Benefit Plan, Benefit Obligation		253.7	289.2	274.7
Defined Benefit Plan, Service Cost		4.6	4.5	4.4
Defined Benefit Plan, Interest Cost		10.1	11.5	$ 12.1
Defined Benefit Plan, Actuarial Net (Gains) Losses		$ 38.4	$ (9.7)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5.00%	5.00%	5.00%
Defined Benefit Plan, Plan Assets, Amount		$ 0.0	$ 0.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(253.7)	(289.2)
Liability, Defined Benefit Plan, Current		(13.3)	(13.5)
Liability, Other Postretirement Defined Benefit Plan, Noncurrent		(240.4)	(275.7)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		1.1	3.5
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		0.0	0.0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		1.1	3.5
pension and other postretirement benefit plans, regulated assets, net gains, before tax		10.9	43.3
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax		0.0	0.0
Pension and other postretirement benefit plans, regulatory assets, before tax		10.9	43.3
Defined Benefit Plan, Shared Costs Deferred		12.4	14.7
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax		(31.8)	9.4	$ 11.1
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax		(0.6)	(0.8)	(0.4)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax		0.0	0.0	(0.3)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax		$ (32.4)	$ 8.6	$ 10.4
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.74%	4.30%	4.78%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		3.00%	3.00%	3.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year		7.00%	6.60%	7.00%
Defined Benefit Plan, Benefit Obligation, Benefits Paid		$ 13.2
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation		863.5	$ 933.2	$ 904.3
Defined Benefit Plan, Service Cost		21.0	21.7	20.7
Defined Benefit Plan, Interest Cost		34.1	37.4	39.4
Defined Benefit Plan, Actuarial Net (Gains) Losses		$ 53.1	$ (42.2)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.35%	3.71%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		3.00%	3.00%
Defined Benefit Plan, Plan Assets, Amount		$ 727.3	$ 849.6
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(136.2)	(83.6)
Liability, Defined Benefit Plan, Current			0.0
Liability, Defined Benefit Pension Plan, Noncurrent		(136.2)	(83.6)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		12.8	8.8
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		0.1	0.1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		12.9	8.9
pension and other postretirement benefit plans, regulated assets, net gains, before tax		230.4	194.8
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax		0.7	1.2
Pension and other postretirement benefit plans, regulatory assets, before tax		231.1	196.0
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax		46.7	(27.1)	29.4
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax		(11.1)	(14.1)	(12.7)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax		(0.5)	(1.4)	(3.4)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax		$ 35.1	$ (42.6)	$ 13.3
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		7.00%	7.25%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.71%	4.22%	4.68%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		3.00%	3.00%	3.00%
Defined Benefit Plan, Benefit Obligation, Benefits Paid		$ 71.7	$ 72.4
SCE&G
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		$ 61.3	62.0
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description		no
Defined Benefit Plan, Period for which Annual Base Earnings are Considered Under Average Pay Formula		3
Defined Benefit Plan, Accumulated Benefit Obligation		$ 714.3	769.7
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		$ 0.6	1.3
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation		0.5	1.1
Defined Benefit Plan, Plan Assets, Amount		676.7	781.3	$ 732.9
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		$ (43.3)	$ 110.4
Defined Benefit Plan Health Care Cost Trend Rate, Assumed		6.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		7.00%
Defined Benefit Plan, Target Allocation, Equity Securities		55.00%	58.00%
Defined Benefit Plan, Target Plan Asset Allocations		34.00%	31.00%
Defined Benefit Plan, Target Plan Asset Allocation, Hedge Funds		11.00%	11.00%
SCE&G \| Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		$ 10.4	$ 10.3
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		1.1	1.1
Defined Benefit Plan, Benefit Obligation		187.4	216.6	207.2
Defined Benefit Plan, Service Cost		3.6	3.7	3.6
Defined Benefit Plan, Interest Cost		8.0	9.5	$ 9.9
Defined Benefit Plan, Actuarial Net (Gains) Losses		30.7	(6.8)
Defined Benefit Plan, Amounts Funded to Parent		$ (0.8)	$ (1.4)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.38%	3.74%
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, Plan Assets, Amount		$ 0.0	$ 0.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(187.4)	(216.6)
Liability, Defined Benefit Plan, Current		(10.5)	(10.8)
Liability, Other Postretirement Defined Benefit Plan, Noncurrent		(176.9)	(205.8)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		0.5	1.5
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		0.0	0.0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		0.5	1.5
pension and other postretirement benefit plans, regulated assets, net gains, before tax		9.0	35.9
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax		0.0	0.0
Pension and other postretirement benefit plans, regulatory assets, before tax		9.0	35.9
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax		(26.4)	7.3	$ 9.2
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax		(0.5)	(0.7)	0.3
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax		0.0	0.0	(0.2)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax		$ (26.9)	$ 6.6	$ 8.7
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.74%	4.30%	4.78%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		3.00%	3.00%	3.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year		7.00%	6.60%	7.00%
SCE&G \| Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Benefits Paid		$ 61.3	$ 62.0
Defined Benefit Plan, Benefit Obligation		732.3	793.0	$ 768.4
Defined Benefit Plan, Service Cost		17.1	18.1	16.9
Defined Benefit Plan, Interest Cost		29.0	31.9	33.4
Defined Benefit Plan, Actuarial Net (Gains) Losses		45.5	(36.6)
Defined Benefit Plan, Amounts Funded to Parent		$ 0.0	$ 0.0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.35%	3.71%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		3.00%	3.00%
Defined Benefit Plan, Plan Assets, Amount		$ 676.7	$ 781.3
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(55.6)	(11.7)
Liability, Defined Benefit Plan, Current			0.0
Liability, Defined Benefit Pension Plan, Noncurrent		(55.6)	(11.7)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		3.4	2.1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		0.0	0.0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		3.4	2.1
pension and other postretirement benefit plans, regulated assets, net gains, before tax		202.4	171.4
Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax		0.6	1.0
Pension and other postretirement benefit plans, regulatory assets, before tax		203.0	172.4
Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax		40.7	(24.8)	26.3
Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax		(9.7)	(12.5)	(11.2)
Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax		(0.4)	(1.3)	(3.0)
Regulatory assets, total recognized in regulatory assets, pension and other postretirement benefit plans, net of tax		$ 30.6	$ (38.6)	$ 12.1
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		7.00%	7.25%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.71%	4.22%	4.68%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		3.00%	3.00%	3.00%
Pension Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority		$ 1.0
Pension Costs [Member] \| SCE&G
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority		$ 2.0
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%
Defined Benefit Plan, Target Allocation, Equity Securities	58.00%
Defined Benefit Plan, Target Plan Asset Allocations	33.00%
Defined Benefit Plan, Target Plan Asset Allocation, Hedge Funds	9.00%
Scenario, Forecast [Member] \| SCE&G
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation, Equity Securities	58.00%
Defined Benefit Plan, Target Plan Asset Allocations	33.00%
Defined Benefit Plan, Target Plan Asset Allocation, Hedge Funds	9.00%

Defined Benefit Plan, Amounts Funded to Parent

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Represents the amount of pension and other post retirement benefits deferred attributable to the share of regulatory authority.

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The assumed health care cost trend rate used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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Represents the number of years of annual base earnings received by employees that are considered under average pay formula for employees hired before January 1, 2000.

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Defined Benefit Plan, Target Plan Asset Allocation, Debt Securities

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Defined Benefit Plan, Target Plan Asset Allocation, Hedge Funds

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- Definition

pension and other postretirement benefit plans, regulated assets, net gains, before tax

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Pension and other postretirement benefit plans, regulatory assets, before tax

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Pension and other postretirement benefit plans, regulatory assets, net prior service costs (credit), before tax

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Regulatory assets, amortization of actuarial losses, pension and other postretirement benefit plans, net of tax

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No definition available.

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Regulatory assets, amortization of prior service cost, pension and other postretirement benefit plans, net of tax

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Regulatory assets, pension and other postretirement benefit plans, net unamortized gain (loss) arising during the period, net of tax

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No definition available.

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- Definition

Regulatory assets, total recognized in regulatory assets during period, pension and other postretirement benefit plans, net of tax

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No definition available.

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 20
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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

+ References

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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