COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and contingencies
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 8
Asset Retirement Obligation, Liabilities Incurred	3,000,000	6,000,000
Asset Retirement Obligation, Liabilities Settled	(6,000,000)	(4,000,000)
Environmental
Regulatory assets	1,823,000,000	1,360,000,000
Operating Leases, Rent Expense	12.3	14.8	14.8
Guarantor Obligations, Maximum Exposure, Undiscounted	1,700,000,000
Asset Retirement Obligation, Accretion Expense	26,000,000	25,000,000
Asset Retirement Obligation, Revision of Estimate	(36,000,000)	(12,000,000)
Asset Retirement Obligation	563,000,000	576,000,000	561,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	5
Operating Leases, Future Minimum Payments, Due in Three Years	2
Operating Leases, Future Minimum Payments, Due in Four Years	1
Operating Leases, Future Minimum Payments, Due in Five Years	2
Operating Leases, Future Minimum Payments, Due Thereafter	20
Operating Leases, Future Minimum Payments Due	38
Asset Retirement Obligation Other Conditional Obligations	362,000,000
Jointly Owned Nuclear Power Plant [Member]
Nuclear Insurance
Maximum liability assessment per reactor for each nuclear incident	127,300,000
SCE&G
Commitments and contingencies
Federal Limit on Public Liability Claims from Nuclear Incident Approximate	13,600,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	6
Asset Retirement Obligation, Liabilities Incurred	3,000,000	5,000,000
Asset Retirement Obligation, Liabilities Settled	(6,000,000)	(4,000,000)
Nuclear Insurance
scg_Maximum Insurance Coverage for each Nuclear Plant by ANI	375,000,000
Maximum liability assessment per reactor for each nuclear incident	84,800,000
Maximum yearly assessment per reactor	18,900,000
Maximum prosepective insurance premium per nuclear incident	43,500,000
Maximum amount of coverage to nuclear facility for property damage and outage costs	2,750,000,000
Maximum amount of coverage for accidental property damage	500,000,000
Environmental
Environmental Remediation Expense	19,300,000
Deferred costs, net of costs previously recovered through rates and insurance settlements included in regulatory assets	35,500,000
Number of MGP Sites Requiring Clean Up [Member]	4
Regulatory assets	1,745,000,000	1,303,000,000
Operating Leases, Rent Expense	12.1	13.6	9.6
NPDES permit number of years	5
Asset Retirement Obligation Nuclear Decommissioning	201,000,000
Asset Retirement Obligation, Accretion Expense	25,000,000	24,000,000
Asset Retirement Obligation, Revision of Estimate	(33,000,000)	(13,000,000)
Asset Retirement Obligation	536,000,000	547,000,000	535,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	3
Operating Leases, Future Minimum Payments, Due in Three Years	1
Operating Leases, Future Minimum Payments, Due in Four Years	0
Operating Leases, Future Minimum Payments, Due in Five Years	1
Operating Leases, Future Minimum Payments, Due Thereafter	18
Operating Leases, Future Minimum Payments Due	29
Asset Retirement Obligation Other Conditional Obligations	335,000,000
PSNC Energy
Environmental
Number of MGP Sites Requiring Clean Up [Member]	5
Regulatory assets	1,000,000
SCE&G | SCE&G
Nuclear Insurance
Maximum yearly assessment per reactor	$ 12,600,000