COMMITMENTS AND CONTINGENCIES (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments and contingencies
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 10,000,000
Asset Retirement Obligation, Liabilities Incurred	0	$ 3,000,000
Asset Retirement Obligation, Liabilities Settled	(16,000,000)	(6,000,000)
Environmental
Regulatory assets	1,937,000,000	1,823,000,000	$ 1,823,000,000
Operating Leases, Rent Expense	11.1	12.3	14.8
Nuclear Generation
Guarantor Obligations, Maximum Exposure, Undiscounted	1,800,000,000
Asset Retirement Obligation, Accretion Expense	25,000,000	26,000,000
Asset Retirement Obligation, Revision of Estimate	(52,000,000)	(36,000,000)
Asset Retirement Obligation	520,000,000	563,000,000	576,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	7,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	6,000,000
Operating Leases, Future Minimum Payments, Due in Four Years	6,000,000
Operating Leases, Future Minimum Payments, Due in Five Years	3,000,000
Operating Leases, Future Minimum Payments, Due Thereafter	27,000,000
Asset Retirement Obligation Other Conditional Obligations	344,000,000
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	13,400,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4,000,000
Asset Retirement Obligation, Liabilities Incurred	0	3,000,000
Asset Retirement Obligation, Liabilities Settled	(16,000,000)	(6,000,000)
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 Insurance Coverage for Nuclear events	2,750,000,000
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	18,500,000
Deferred costs, net of costs previously recovered through rates and insurance settlements included in regulatory assets	$ 34,800,000
Number of MGP Sites Requiring Clean Up [Member]	4
Regulatory assets	$ 1,857,000,000	1,745,000,000	1,745,000,000
Operating Leases, Rent Expense	12.3	12.1	13.6
Nuclear Generation
Asset Retirement Obligation Nuclear Decommissioning	176,000,000
Asset Retirement Obligation, Accretion Expense	23,000,000	25,000,000
Asset Retirement Obligation, Revision of Estimate	(55,000,000)	(33,000,000)
Asset Retirement Obligation	488,000,000	536,000,000	$ 547,000,000
Operating Leases, Future Minimum Payments, Due in Two Years	2,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	1,000,000
Operating Leases, Future Minimum Payments, Due in Four Years	1,000,000
Operating Leases, Future Minimum Payments, Due in Five Years	1,000,000
Operating Leases, Future Minimum Payments, Due Thereafter	17,000,000
Asset Retirement Obligation Other Conditional Obligations	312,000,000
Summer Station New Units and Transmission Assets [Member]
Nuclear Generation
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	3,600,000,000
Summer Station New Units [Domain]
Nuclear Generation
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress	3,400,000,000	$ 2,700,000,000
jointly owned utility plant ownership, construction financing cost	3,200,000,000
SCE&G | SCE&G
Nuclear Insurance
Maximum yearly assessment per reactor	$ 12,600,000