RATE AND OTHER REGULATORY MATTERS (Details 2) (USD $) In Millions			1 Months Ended	6 Months Ended					6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended		6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jul. 31, 2010 SCE&G	Jun. 30, 2011 SCE&G	Jun. 30, 2011 Accumulated deferred income taxes	Dec. 31, 2010 Accumulated deferred income taxes	Jun. 30, 2011 Under-collections-electric fuel adjustment clause	Dec. 31, 2010 Under-collections-electric fuel adjustment clause	Jun. 30, 2011 Environmental remediation costs	Dec. 31, 2010 Environmental remediation costs	Jun. 30, 2011 Asset retirement obligations and related funding	Dec. 31, 2010 Asset retirement obligations and related funding	Jun. 30, 2011 Franchise agreements	Dec. 31, 2010 Franchise agreements	Jun. 30, 2011 Deferred employee benefit plan costs	Dec. 31, 2010 Deferred employee benefit plan costs	Jun. 30, 2011 Planned major maintenance	Dec. 31, 2010 Planned major maintenance	Jun. 30, 2011 Deferred losses on interest rate derivatives	Dec. 31, 2010 Deferred losses on interest rate derivatives	Jun. 30, 2011 Other.	Dec. 31, 2010 Other.
Regulatory Assets:
Regulatory assets	$ 1,128.0	$ 1,061.0			$ 210.0	$ 210.0	$ 59.0	$ 25.0	$ 31.0	$ 32.0	$ 310.0	$ 298.0	$ 42.0	$ 45.0	$ 321.0	$ 326.0	$ 19.0	$ 6.0	$ 90.0	$ 83.0	$ 46.0	$ 36.0
Regulatory assets, expected recovery period (in years)					70 years				18 years		95 years		20 years		14 years				30 years		30 years
Amount recovered through electric rates to offset turbine maintenance expenditures			$ 8.5	$ 18.4
Accrual period of nuclear refueling charges (in months)				18M