LONG-TERM AND SHORT-TERM DEBT (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,800.0
Commercial Paper Maximum Term
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 Maximum Term
Commercial Paper		$ (258.0)		$ (709.0)
Debt, Weighted Average Interest Rate		0.46%		0.52%
Letters of Credit Outstanding, Amount		$ 0.3		$ 0.3
Line of Credit Facility, Remaining Borrowing Capacity		1,142.0		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		$ 0.0		$ (30.0)
Debt, Weighted Average Interest Rate		0.00%		0.65%
Letters of Credit Outstanding, Amount		$ 0.0		$ 0.0
Line of Credit Facility, Remaining Borrowing Capacity		100.0		$ 70.0
Fuel Company
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500.0