LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000.0	$ 2,000.0
Long-Term Line of Credit - SC Fuel Co only	500.0	500.0
Commercial Paper	917.0	531.0
Letters of Credit Outstanding, Amount	3.3	3.3
Line of Credit Facility, Remaining Borrowing Capacity	1,080.0	1,466.0
Debt Instrument, Face Amount	67.8
SCE&G (including Fuel Company)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,400.0	1,400.0
Commercial Paper	$ 870.0	$ 420.0
Debt, Weighted Average Interest Rate	0.83%	0.74%
Letters of Credit Outstanding, Amount	$ 0.3	$ 0.3
Line of Credit Facility, Remaining Borrowing Capacity	530.0	980.0
SCEG
Debt Instrument [Line Items]
Debt Instrument, Face Amount	67.8
SCANA [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400.0	400.0
Commercial Paper	$ 10.0	$ 37.0
Debt, Weighted Average Interest Rate	0.90%	1.19%
Letters of Credit Outstanding, Amount	$ 3.0	$ 3.0
Line of Credit Facility, Remaining Borrowing Capacity	387.0	360.0
PSNC Energy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200.0	200.0
Commercial Paper	$ 37.0	$ 74.0
Debt, Weighted Average Interest Rate	0.81%	0.77%
Line of Credit Facility, Remaining Borrowing Capacity	$ 163.0	$ 126.0
Fuel Company
Debt Instrument [Line Items]
Long-Term Line of Credit - SC Fuel Co only	500.0	500.0
Expires December 2020 [Domain]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,300.0	1,300.0
Expires December 2020 [Domain] | SCEG
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	700.0	700.0
Expires December 2020 [Domain] | SCANA [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400.0	400.0
Expires December 2020 [Domain] | PSNC Energy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200.0	200.0
Expires December 2016 [Domain]
Debt Instrument [Line Items]
Long-term Line of Credit - SCE&G only	200.0	200.0
Expires December 2016 [Domain] | SCEG
Debt Instrument [Line Items]
Long-term Line of Credit - SCE&G only	$ 200.0	$ 200.0