RATE AND OTHER REGULATORY MATTERS (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	24 Months Ended
	Mar. 31, 2013	Jul. 31, 2012	Dec. 31, 2012
Regulatory Assets
MPG enviromental remediatio	28
Regulatory Noncurrent Asset, Amortization Period	30
Regulatory Assets, Noncurrent	$ 1,451.0		$ 1,464.0
SCEG
Regulatory Assets
MPG enviromental remediatio	28
Regulatory Noncurrent Asset, Amortization Period	30
Regulatory Assets, Noncurrent	1,365.0		1,377.0
Amounts Recovered through Electric Rates to offset Turbine Expense		18.4
Deferred Income Tax Charges [Member]
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	70
Regulatory Assets, Noncurrent	254.0		254.0
Deferred Income Tax Charges [Member] | SCEG
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	70
Regulatory Assets, Noncurrent	248.0		248.0
Regulatory Clause Revenues, under-recovered [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	75.0		66.0
Regulatory Clause Revenues, under-recovered [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	75.0		66.0
Environmental Restoration Costs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	43.0		44.0
Environmental Restoration Costs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	38.0		39.0
Asset Retirement Obligation Costs [Member]
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	95
Regulatory Assets, Noncurrent	324.0		319.0
Asset Retirement Obligation Costs [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	307.0		304.0
Franchise agreement Costs
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	20
Regulatory Assets, Noncurrent	34.0		36.0
Franchise agreement Costs | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	34.0		36.0
Pension Costs [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	452.0		460.0
Pension Costs [Member] | SCEG
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	12
Regulatory Assets, Noncurrent	399.0		405.0
Planned major maintenance [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	0		6.0
Planned major maintenance [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	0		6.0
Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	30
Regulatory Assets, Noncurrent	141.0		151.0
Deferred Losses On Interest Rate Derivatives [Member] | SCEG
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	30
Regulatory Assets, Noncurrent	141.0		151.0
Deferred Pollution Control Costs
Regulatory Assets
Regulatory Assets, Noncurrent	38.0		38.0
Deferred Pollution Control Costs | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	38.0		38.0
unrecovered plant [Member]
Regulatory Assets
Regulatory Assets, Noncurrent	20.0
unrecovered plant [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	20.0		20.0
Other Regulatory Assets [Member]
Regulatory Assets
Regulatory Noncurrent Asset, Amortization Period	30
Regulatory Assets, Noncurrent	70.0		70.0
Other Regulatory Assets [Member] | SCEG
Regulatory Assets
Regulatory Assets, Noncurrent	$ 65.0		$ 64.0