COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2005	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2014
Commitments and contingencies
Operating Leases, Future Minimum Payments Due, Next Twelve Months		$ 7
Asset Retirement Obligation, Liabilities Incurred		6,000,000	0
Asset Retirement Obligation, Liabilities Settled		(4,000,000)	(5,000,000)
Environmental
Regulatory assets		1,360,000,000	1,464,000,000
Operating Leases, Rent Expense		14.8	14.8	15.8
Nuclear Generation
Guarantor Obligations, Maximum Exposure, Undiscounted		1,600,000,000
Asset Retirement Obligation, Accretion Expense		25,000,000	24,000,000
Asset Retirement Obligation, Revision of Estimate		(12,000,000)	69,000,000
Asset Retirement Obligation		576,000,000	561,000,000	473,000,000
Operating Leases, Future Minimum Payments, Due in Two Years		6
Operating Leases, Future Minimum Payments, Due in Three Years		4
Operating Leases, Future Minimum Payments, Due in Four Years		2
Operating Leases, Future Minimum Payments, Due in Five Years		1
Operating Leases, Future Minimum Payments, Due Thereafter		21
Operating Leases, Future Minimum Payments Due		41
Asset Retirement Obligation Other Conditional Obligations		385,000,000
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		4
Asset Retirement Obligation, Liabilities Incurred		5,000,000	0
Asset Retirement Obligation, Liabilities Settled		(4,000,000)	(5,000,000)
Nuclear Insurance
scg_Maximum Insurance Coverage for each Nuclear Plant by ANI			375,000,000
Maximum liability assessment per reactor for each nuclear incident			127,300,000	84,800,000
Maximum yearly assessment per reactor			18,900,000
Maximum prosepective insurance premium per nuclear incident		41,600,000
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
Maximum loss for a single nuclear incident		2,750,000,000
Current ownership share in New Unit		55.00%
Total additional ownership in new units									5.00%
Additional ownership in new units						2.00%	2.00%	1.00%
Jointly owned plant cost of additional 5%		500,000,000
Environmental
Environmental Remediation Expense		20,200,000
Deferred costs, net of costs previously recovered through rates and insurance settlements included in regulatory assets			36,700,000
Number of MGP Sites Requiring Clean Up [Member]		4
Regulatory assets		1,303,000,000	1,377,000,000
Operating Leases, Rent Expense		13.6	9.6	10.8
Nuclear Generation
Estimated cash outflow for plant costs and related transmission infrastructure costs of nuclear electric generation site		5,400,000,000
Delay costs related to New Units		200,000,000
Est Delay cost for new unit		200,000,000
Number of States Required to Reduce Emission to Attain Mandated Levels					28
NPDES permit number of years		5
Jointly Owned Utility Plant, Minimum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays			1
Jointly Owned Utility Plant, Maximum Period for which Escalation Rates are Considered to Determine Estimated Cash Outlays			5
Capital Cost Related to New Federal Healthcare Etc.			1,000,000
Public Utilities, Property, Plant and Equipment Identifiable Capital Costs			278,000,000
Share in Approved Capital Costs	173,900,000		8,000,000
Public Utilities Additional Labor Expenses for Oversight of New Units			132,000,000
Asset Retirement Obligation Nuclear Decommissioning		191,000,000
Asset Retirement Obligation, Accretion Expense		24,000,000	23,000,000
Asset Retirement Obligation, Revision of Estimate		(13,000,000)	67,000,000
Asset Retirement Obligation		547,000,000	535,000,000	450,000,000
Operating Leases, Future Minimum Payments, Due in Two Years		3
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		1
Operating Leases, Future Minimum Payments, Due Thereafter		19
Operating Leases, Future Minimum Payments Due		30
Asset Retirement Obligation Other Conditional Obligations		356,000,000
PSNC Energy
Environmental
Number of MGP Sites Requiring Clean Up [Member]		5
Regulatory assets			2,800,000
SCE&G | SCE&G
Nuclear Insurance
Maximum yearly assessment per reactor			$ 12,600,000