LONG-TERM AND SHORT-TERM DEBT (Details 2) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000.0	$ 2,000.0
Commercial Paper	778.0	531.0
Letters of Credit Outstanding, Amount	3.3	3.3
Line of Credit Facility, Remaining Borrowing Capacity	1,219.0	1,465.0
3 Year Credit [Domain]
Debt Instrument [Line Items]
Long-term Line of Credit - SCE&G only	200.0	200.0
five year credit [Domain]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,300.0	1,300.0
SCANA [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400.0	400.0
Commercial Paper	$ 16.0	$ 37.0
Debt, Weighted Average Interest Rate	0.93%	1.19%
Letters of Credit Outstanding, Amount	$ 3.0	$ 3.0
Line of Credit Facility, Remaining Borrowing Capacity	381.0	360.0
SCEG including Fuel Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,400.0	1,400.0
Commercial Paper	$ 714.0	$ 420.0
Debt, Weighted Average Interest Rate	0.84%	0.74%
Letters of Credit Outstanding, Amount	$ 0.3	$ 0.3
Line of Credit Facility, Remaining Borrowing Capacity	686.0	980.0
Fuel Company [Member]
Debt Instrument [Line Items]
Long-Term Line of Credit - SC Fuel Co only	500.0	500.0
SCEG
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	700.0	700.0
Long-term Line of Credit - SCE&G only	200.0	200.0
PSNC Energy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200.0	200.0
Commercial Paper	$ 47.0	$ 74.0
Debt, Weighted Average Interest Rate	0.8295%	0.77%
Line of Credit Facility, Remaining Borrowing Capacity	$ 153.0	$ 126.0