FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Carrying Amount
Financial instruments for which the carrying amount may not equal estimated fair value
Long-term debt	$ 5,441.5	$ 5,449.3
Estimated Fair Value
Financial instruments for which the carrying amount may not equal estimated fair value
Long-term debt	6,096.8	5,916.3
SCEG | Carrying Amount
Financial instruments for which the carrying amount may not equal estimated fair value
Long-term debt	4,047.6	4,054.9
SCEG | Estimated Fair Value
Financial instruments for which the carrying amount may not equal estimated fair value
Long-term debt	$ 4,574.2	$ 4,433.0