LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		9 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,800.0
Commercial Paper Maximum Term				270
Number of other banks (in entities)				2
Long-term Debt, Current Maturities				$ 16.0	$ 166.0
Debt Instrument, Interest Rate Terms	0.077	.051
Junior Subordinated Notes	$ 150.0
Credit Suisse AG, Cayman Islands Branch (Member)
Debt Instrument [Line Items]
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank				8.90%
Branch Banking Trust Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank				6.30%
SCE&G (including Fuel Company)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,400.0	1,400.0
Commercial Paper				$ 234.0	$ 709.0
Debt, Weighted Average Interest Rate				0.44%	0.52%
Letters of Credit Outstanding, Amount				$ 0.3	$ 0.3
Line of Credit Facility, Remaining Borrowing Capacity				1,166.0	691.0
SCEG
Debt Instrument [Line Items]
Proceeds from Issuance of First Mortgage Bond		$ 500.0	$ 300.0
Line of Credit Facility, Maximum Borrowing Capacity				1,200.0
Long-term Debt, Current Maturities				10.0	10.0
Debt Instrument, Face Amount				$ 67.8
Debt Instrument, Interest Rate Terms		0.051	.045
SCEG | Branch Banking Trust Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility Percentage of Credit Facilities Provided by Each Bank				8.90%
PSNC Energy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 100.0	100.0
Commercial Paper				16.0	$ 30.0
Debt, Weighted Average Interest Rate					0.65%
Letters of Credit Outstanding, Amount				0.0	$ 0.0
Line of Credit Facility, Remaining Borrowing Capacity				84.0	$ 70.0
Fuel Company
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 500.0