LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt Current Maturities in Next Twelve Months	$ 116.0
Medium-term Notes	800.0	$ 800.0
Senior Notes	84.0	88.0
First Mortgage Bonds	4,340.0	3,840.0
GENCO Notes	220.0	227.0
Industrial and Pollution Control Bonds	122.0	122.0
Senior Notes, Noncurrent	350.0	350.0
Long Term Contract for Nuclear Fuel Purchase	100.0	100.0
Other Long-term Debt	18.0	167.0
Long-term Debt, Gross	6,034.0	5,694.0
Long-term Debt, Current Maturities	(116.0)	(166.0)
Debt Instrument, Unamortized Discount	0.0	3.0
Unamortized Debt Issuance Expense	(36.0)	(34.0)
Long-term Debt	5,882.0	$ 5,497.0
Long-term Debt, Maturities, Repayments of Principal in Year Two	15.0
Long-term Debt, Maturities, Repayments of Principal in Year Three	724.0
Long-term Debt, Maturities, Repayments of Principal in Year Four	13.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 363.0
Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.42%	5.42%
Debt Instrument, Redemption Period, Start Date	Apr. 01, 2020
Debt Instrument, Redemption Period, End Date	Feb. 01, 2022
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.11%	0.93%
Debt Instrument, Redemption Period, Start Date	Jun. 01, 2016
Debt Instrument, Redemption Period, End Date	Jun. 01, 2034
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		6.17%
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.78%	5.56%
Debt Instrument, Redemption Period, Start Date	Nov. 01, 2018
Debt Instrument, Redemption Period, End Date	Jun. 01, 2065
Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.92%	5.90%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2016
Debt Instrument, Redemption Period, End Date	Feb. 01, 2024
Industrial and Pollution Control Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.51%	3.51%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2028
Debt Instrument, Redemption Period, End Date	Dec. 01, 2038
Long-term Debt, Percentage Bearing Variable Interest, Amount	$ 67.8
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	0.03%	0.04%
Senior Debentures [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.93%	5.93%
Debt Instrument, Redemption Period, Start Date	Mar. 30, 2020
Debt Instrument, Redemption Period, End Date	Dec. 15, 2026
Nuclear fuel purchase contract [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.78%	0.78%
Debt Instrument, Redemption Period, End Date	Nov. 01, 2016
Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.72%	7.39%
Debt Instrument, Redemption Period, Start Date	Jan. 01, 2016
Debt Instrument, Redemption Period, End Date	Sep. 30, 2027
SCE&G
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	0.051	0.045
Proceeds from Issuance of First Mortgage Bond	$ 500.0	$ 300.0
Long-term Debt Current Maturities in Next Twelve Months	110.0
First Mortgage Bonds	4,340.0	3,840.0
GENCO Notes	220.0	227.0
Industrial and Pollution Control Bonds	122.0	122.0
Long Term Contract for Nuclear Fuel Purchase	100.0	100.0
Other Long-term Debt	17.0	14.0
Long-term Debt, Gross	4,799.0	4,303.0
Long-term Debt, Current Maturities	(110.0)	(10.0)
Debt Instrument, Unamortized Discount	2.0	6.0
Unamortized Debt Issuance Expense	(32.0)	(29.0)
Long-term Debt	4,659.0	$ 4,270.0
Long-term Debt, Maturities, Repayments of Principal in Year Two	10.0
Long-term Debt, Maturities, Repayments of Principal in Year Three	720.0
Long-term Debt, Maturities, Repayments of Principal in Year Four	9.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 8.0
SCE&G \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.78%	5.56%
Debt Instrument, Redemption Period, Start Date	Nov. 01, 2018
Debt Instrument, Redemption Period, End Date	Jun. 01, 2065
SCE&G \| Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.92%	5.90%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2016
Debt Instrument, Redemption Period, End Date	Feb. 01, 2024
SCE&G \| Industrial and Pollution Control Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.51%	3.51%
Debt Instrument, Redemption Period, Start Date	Feb. 01, 2028
Debt Instrument, Redemption Period, End Date	Dec. 01, 2038
Long-term Debt, Percentage Bearing Variable Interest, Amount	$ 67.8
SCE&G \| Nuclear fuel purchase contract [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	0.78%	0.78%
Debt Instrument, Redemption Period, End Date	Nov. 01, 2016
SCE&G \| Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.63%	2.63%
Debt Instrument, Redemption Period, Start Date	Jan. 31, 2016
Debt Instrument, Redemption Period, End Date	Sep. 30, 2027

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GENCO Notes

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Industrial and Pollution Control Bonds

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Long Term Contract for Nuclear Fuel Purchase

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Weighted average interest rate of debt outstanding.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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