RATE AND OTHER REGULATORY MATTERS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 MW	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Regulatory Liabilities:
Regulatory liabilities	$ 882	$ 966
Deferred Income Tax Charges [Member]
Regulatory Liabilities:
Regulatory liabilities	23	24
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities:
Regulatory liabilities	705	695
Storm damage reserve [Member]
Regulatory Liabilities:
Regulatory liabilities	14
Amount allowed to be recovered through electric rates to offset incremental storm damage costs	100
Annual amount of storm damage costs which can not be offset by amounts recovered through electric rates	2.5
Monetization bankruptcy claim [Member]
Regulatory Liabilities:
Regulatory liabilities	28	29
Deferred gains on interest rate derivatives
Regulatory Liabilities:
Regulatory liabilities	106
Planned major maintenance [Member]
Regulatory Liabilities:
Regulatory liabilities	5		10
SCEG
Regulatory Liabilities:
Amounts Recovered Through Electric Rates to offset Nuclear Related Outage Costs	16.8
Public Utilities, Percent Increase (Decrease) in Retail Electric Rates		2.90%	2.30%
Public Utilities, Authorized Allowable Return on Common Equity, Percentage	11.00%
Power generation capacity six coal fired units	730
Demand Side Management Program Costs, Noncurrent	15.4		19.6	16.9
Regulatory liabilities	644	732	732
Amount allowed to be recovered through electric rates to offset incremental storm damage costs	100
Annual amount of storm damage costs which can not be offset by amounts recovered through electric rates	2.5
SCEG | Storm damage reserve [Member]
Regulatory Liabilities:
Regulatory liabilities		27
SCEG | Deferred gains on interest rate derivatives
Regulatory Liabilities:
Regulatory liabilities		181
SCEG | Planned major maintenance [Member]
Regulatory Liabilities:
Amounts Recovered through Electric Rates to offset Turbine Expense	$ 18.4
Environmental Restoration Costs [Member]
Regulatory Liabilities:
MPG enviromental remediatio	26