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LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($) $ in Millions	6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Contractual Obligation, Due in Next Fiscal Year				$ 40.0
Repayments of First Mortgage Bond			$ 250.0
interest rate first mortgage bonds redeemed			6.50%
interest rate on first mortgage bonds issued			4.25%
Medium-term Notes				800.0	$ 800.0
Senior Notes				70.0	75.0
Borrowings under credit agreement				100.0
First Mortgage Bonds				4,990.0	4,840.0
GENCO Notes				40.0	207.0
Industrial and Pollution Control Bonds				122.0	122.0
Senior Notes, Noncurrent				700.0	600.0
Other Long-term Debt				73.0	28.0
Long-term Debt, Gross				6,795.0	6,672.0
Long-term Debt, Current Maturities				(59.0)	(727.0)
Debt Instrument, Unamortized Discount				2.0	1.0
Unamortized Debt Issuance Expense				(39.0)	(38.0)
Long-term Debt				6,695.0	$ 5,906.0
Long-term Line of Credit				$ 40.0
Line of Credit Facility, Interest Rate at Period End				3.87%
Proceeds from Issuance of First Mortgage Bond				$ 300.0
Long-term Debt Current Maturities in Next Twelve Months				59.0
Long-term Debt, Maturities, Repayments of Principal in Year Two				368.0
Long-term Debt, Maturities, Repayments of Principal in Year Three				797.0
Long-term Debt, Maturities, Repayments of Principal in Year Four				266.0
Long-term Debt, Maturities, Repayments of Principal in Year Five				14.0
Aggregate Purchase Price Bonds				$ 1,000.0
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
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.52%	5.80%
Debt Instrument, Redemption Period, Start Date					Nov. 01, 2021
Debt Instrument, Redemption Period, End Date					Jun. 01, 2065
Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.49%	5.94%
Debt Instrument, Redemption Period, Start Date					Feb. 01, 2019
Debt Instrument, Redemption Period, End Date					Feb. 01, 2024
Industrial and Pollution Control Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				3.52%	3.52%
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				1.72%	1.85%
Senior Debentures [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.07%	5.19%
Debt Instrument, Redemption Period, Start Date					Mar. 30, 2020
Debt Instrument, Redemption Period, End Date					Dec. 15, 2047
Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				3.46%	2.83%
Debt Instrument, Redemption Period, Start Date					Jan. 01, 2019
Debt Instrument, Redemption Period, End Date					Sep. 30, 2027
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				3.44%	2.18%
Debt Instrument, Redemption Period, Start Date					Jun. 01, 2019
Debt Instrument, Redemption Period, End Date					Jun. 01, 2034
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				6.17%
SCE&G
Debt Instrument [Line Items]
Repayments of First Mortgage Bond			$ 300.0
interest rate first mortgage bonds redeemed			5.25%
Medium-term Notes				$ 300.0
First Mortgage Bonds				4,990.0	$ 4,840.0
GENCO Notes			$ 160.0	40.0	207.0
Industrial and Pollution Control Bonds				122.0	122.0
Other Long-term Debt				30.0	28.0
Long-term Debt, Gross				5,182.0	5,197.0
Long-term Debt, Current Maturities				(14.0)	(723.0)
Debt Instrument, Unamortized Discount (Premium), Net				(1.0)	1.0
Unamortized Debt Issuance Expense				(35.0)	(34.0)
Long-term Debt				5,132.0	4,441.0
Debt, Weighted Average Interest Rate			6.06%
Proceeds from Issuance of First Mortgage Bond			$ 400.0
Long-term Debt, Maturities, Repayments of Principal in Year Two					$ 13.0
Long-term Debt, Maturities, Repayments of Principal in Year Three				342.0
Long-term Debt, Maturities, Repayments of Principal in Year Four				11.0
Long-term Debt, Maturities, Repayments of Principal in Year Five				$ 9.0
SCE&G \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.52%	5.80%
Debt Instrument, Redemption Period, End Date					Jun. 01, 2065
SCE&G \| Genco Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.49%	5.94%
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				3.52%	3.52%
Debt Instrument, Redemption Period, End Date					Dec. 01, 2038
Long-term Debt, Percentage Bearing Variable Interest, Amount				$ 67.8
SCE&G \| Other Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				2.97%	2.83%
Debt Instrument, Redemption Period, Start Date					Jan. 31, 2019
Debt Instrument, Redemption Period, End Date					Sep. 30, 2027
SCEG including Fuel Company [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				3.82%	1.92%
Long-term Debt Current Maturities in Next Twelve Months				$ 14.0
PSNC Energy [Member]
Debt Instrument [Line Items]
Senior Notes	$ 100.0	$ 150.0
Debt Instrument, Interest Rate, Increase (Decrease)	4.33%	4.18%
Debt, Weighted Average Interest Rate				3.49%	1.93%
First Mortgage Bond rate [Domain]
Debt Instrument [Line Items]
interest rate on first mortgage bonds issued				3.50%