RATE AND OTHER REGULATORY MATTERS REGULATORY ASSETS AND LIABILITIES(Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Regulatory Assets, Noncurrent	$ 1,823.0	$ 1,360.0
Regulatory Liability, Noncurrent	814	966
Other Regulatory Liability [Member]
Regulatory Liability, Noncurrent	1
Planned major maintenance [Member]
Regulatory Liability, Noncurrent	0	10
Amounts Recovered through Electric Rates to offset Turbine Expense	18.4
Storm damage reserve [Member]
Regulatory Liability, Noncurrent	6	27
Asset Retirement Obligation Costs [Member]
Regulatory Liability, Noncurrent	703	695
Deferred Income Tax Charge [Member]
Regulatory Liability, Noncurrent	22	24
Monetization bankruptcy claim [Member]
Regulatory Liability, Noncurrent	0	29
Deferred gains on interest rate derivatives [Member]
Regulatory Liability, Noncurrent	82	181
Deferred Income Tax Charge [Member]
Regulatory Noncurrent Asset, Amortization Period	70
Regulatory Assets, Noncurrent	284.0	259.0
Regulatory Clause Revenues, under-recovered [Member]
Regulatory Assets, Noncurrent	20.0	18.0
Environmental Restoration Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	25
Regulatory Assets, Noncurrent	40.0	41.0
Asset Retirement Obligation Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	90
Regulatory Assets, Noncurrent	366.0	368.0
Franchise agreement Costs [Member]
Regulatory Assets, Noncurrent	26.0	31.0
Pension Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	12	14	30
Regulatory Assets, Noncurrent	350.0	238.0
Planned major maintenance [Member]
Regulatory Assets, Noncurrent	2.0	0
Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Noncurrent Asset, Amortization Period	P50Y
Regulatory Assets, Noncurrent	453.0	124.0
Deferred Pollution Control Cost [Member]
Regulatory Assets, Noncurrent	36.0	37.0
Canadys Refined Coal [Member]
Regulatory Assets, Noncurrent	137.0
Demand Side Management programs [Member]
Regulatory Assets, Noncurrent	56.0	51.0
Other Regulatory Assets [Member]
Regulatory Noncurrent Asset, Amortization Period	P30Y
Regulatory Assets, Noncurrent	53.0	48.0
SCE&G
Regulatory Noncurrent Asset, Amortization Period	12
Regulatory Assets, Noncurrent	1,745.0	1,303.0
Regulatory Liability, Noncurrent	610	732
SCE&G | Planned major maintenance [Member]
Regulatory Liability, Noncurrent	0
Amounts Recovered through Electric Rates to offset Turbine Expense	18.4
SCE&G | Storm damage reserve [Member]
Regulatory Liability, Noncurrent	6	27
SCE&G | Asset Retirement Obligation Costs [Member]
Regulatory Liability, Noncurrent	505	495
SCE&G | Deferred Income Tax Charge [Member]
Regulatory Liability, Noncurrent	17
SCE&G | Deferred gains on interest rate derivatives [Member]
Regulatory Liability, Noncurrent	82	181
SCE&G | Deferred Income Tax Charge [Member]
Regulatory Noncurrent Asset, Amortization Period	70
Regulatory Assets, Noncurrent	278.0	256.0
SCE&G | Regulatory Clause Revenues, under-recovered [Member]
Regulatory Assets, Noncurrent	20.0	18.0
SCE&G | Environmental Restoration Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	25
Regulatory Assets, Noncurrent	36.0	37.0
SCE&G | Asset Retirement Obligation Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	90
Regulatory Assets, Noncurrent	347.0	350.0
SCE&G | Franchise agreement Costs [Member]
Regulatory Assets, Noncurrent	26.0	31.0
SCE&G | Pension Costs [Member]
Regulatory Noncurrent Asset, Amortization Period	12	14
Regulatory Assets, Noncurrent	310.0	215.0
SCE&G | Planned major maintenance [Member]
Regulatory Assets, Noncurrent	2.0	0
SCE&G | Deferred Losses On Interest Rate Derivatives [Member]
Regulatory Assets, Noncurrent	453.0	124.0
SCE&G | Deferred Pollution Control Cost [Member]
Regulatory Assets, Noncurrent	36.0	37.0
SCE&G | Canadys Refined Coal [Member]
Regulatory Assets, Noncurrent	137.0	145.0
SCE&G | Demand Side Management programs [Member]
Regulatory Assets, Noncurrent	56.0	51.0
SCE&G | Other Regulatory Assets [Member]
Regulatory Noncurrent Asset, Amortization Period	50
Regulatory Assets, Noncurrent	$ 44.0	$ 39.0
Pension Plan, Defined Benefit | SCE&G | Other Regulatory Assets [Member]
Regulatory Noncurrent Asset, Amortization Period	30