EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2014	Sep. 30, 2014 Pension Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2014 Pension Benefits	Sep. 30, 2013 Pension Benefits	Sep. 30, 2014 Other Postretirement Benefits	Sep. 30, 2013 Other Postretirement Benefits	Sep. 30, 2014 Other Postretirement Benefits	Sep. 30, 2013 Other Postretirement Benefits	Mar. 31, 2014 SCEG	Sep. 30, 2014 SCEG Pension Benefits	Sep. 30, 2013 SCEG Pension Benefits	Sep. 30, 2014 SCEG Pension Benefits	Sep. 30, 2013 SCEG Pension Benefits	Sep. 30, 2014 SCEG Other Postretirement Benefits	Sep. 30, 2013 SCEG Other Postretirement Benefits	Sep. 30, 2014 SCEG Other Postretirement Benefits	Sep. 30, 2013 SCEG Other Postretirement Benefits	Dec. 31, 2012 Pension Costs [Member] SCEG	Sep. 30, 2014 Pension Costs [Member] SCEG	Dec. 31, 2013 Pension Costs [Member] SCEG
Pension and Other Postretirement Benefit Plans
Pension Contributions	No									No
Components of Net Periodic Benefit Cost
Service cost		$ 5.0	$ 5.1	$ 15.0	$ 16.9	$ 0.9	$ 1.2	$ 3.4	$ 4.4		$ 4.0	$ 4.1	$ 12.0	$ 13.7	$ 0.7	$ 1.0	$ 2.7	$ 3.5
Interest cost		9.9	9.5	30.3	28.4	2.8	2.8	9.0	8.3		8.4	8.0	25.6	24.0	2.3	2.1	7.1	6.5
Expected return on assets		(16.4)	(15.1)	50.0	45.8	0	0	0	0		13.9	12.7	42.2	38.7	0	0	0	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax		1.1	1.5	3.1	4.9	0.1	0.1	0.3	0.5		0.9	1.3	2.6	4.1	0	0.1	0.2	0.4
Defined Benefit Plan, Curtailments			9.9		9.9							8.4		8.4
Defined Benefit Plan, Amortization of Transition Obligations (Assets)				0	0			0	0.3
Defined Benefit Plan, Actuarial Net (Gains) Losses		0.9	3.5	(3.5)	(14.4)	(0.2)	0.8	0	(2.5)		(0.8)	(3.0)	(3.0)	(12.2)	0.2	(0.7)	0	(2.0)
Defined Benefit Plan, Net Periodic Benefit Cost		0.5	14.4	1.9	28.7	3.6	4.9	12.7	16.0		0.2	12.1	1.0	23.7	2.8	3.9	10.0	12.4
Defined Benefit Plan, Deferred Debit Attributable to Share of Regulatory Authority																			$ 63	$ 14
Regulatory Noncurrent Asset, Amortization Period																			30	12	14