RATE AND OTHER REGULATORY MATTERS RATE AND OTHER REGULATORY MATTERS (Details)	3 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
SCPSC Order Reduction Of Total Fuel Cost Component Of Retail Electric Rates To Reflect Lower Projected Fuel Costs And Eliminate Over-Collection Balances				$ 1,900,000,000
SCPSC Order for Increase of Total Fuel Cost Component of Retail Electric Rates to produce a projected under recovery				$ 0.035
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				35.00%
SCE&G
Demand Side Management Program Costs, Noncurrent				$ 37,000,000	$ 37,600,000	$ 32,000,000
Capacity of renewable energy facilities by 2020				84.5
SCPSC Order Reduction Of Total Fuel Cost Component Of Retail Electric Rates To Reflect Lower Projected Fuel Costs And Eliminate Over-Collection Balances					61,000,000
SCPSC Order, Recovery Of Projected DER Program Costs				$ 16,500,000	6,900,000
SCPSC Order for Increase of Total Fuel Cost Component of Retail Electric Rates to produce a projected under recovery				61,000,000
Carrying costs on deferred income tax assets				18,800,000	$ 14,000,000
SCPSC Order, Approx Annual pension rider decrease amount				11,900,000
DSM Program SCPC January 2017 filing, cost and net lost revenue recovery [Line Items]				$ 37,000,000
PSNC Energy [Member]
Pipeline integrity mgmt annual revenue requirement approved by NCUC	$ 700,000	$ 1,900,000
Pipeline integrity management costs [Member] | PSNC Energy [Member]
Regulatory Asset, Amortization Period				2021 years
Deferred Income Tax Charge [Member]
Regulatory Asset, Amortization Period				85 years
Pension Costs [Member] | SCE&G
Regulatory Asset, Amortization Period				11 years
Pension costs, electric [Member] | SCE&G
Regulatory Asset, Amortization Period				2044 years
Pension costs, gas [Member] | SCE&G
Regulatory Asset, Amortization Period				2027 years
Asset Retirement Obligation Costs [Member]
Regulatory Asset, Amortization Period				107 years
Subsequent Event [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%