COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2005	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
SCEG
Nuclear Insurance
Federal Limit on Public Liability Claims from Nuclear Incident Approximate	$ 13,600,000,000
Maximum Insurance Coverage for each Nuclear Plant by ANI	375,000,000
Maximum liability assessment per reactor for each nuclear incident	127,300,000
Maximum Federal Limit on Public Liability Claims Per Incident for Each Year	12,600,000
Maximum yearly assessment per reactor	18,900,000
Maximum Federal Limit on Public Liability Claims per Reactor for each Nuclear Incident at 2/3	84,800,000
Inflation adjustment period for nuclear insurance	5
Maximum retrospective 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
Environmental
Number of MGP decommissioned sites that contain residues of byproduct chemicals	4
Site Contingency MGP Estimated Environmental Remediation Costs	20,200,000
Deferred costs net of costs previously recovered through rates and insurance settlements included in regulatory assets	36,700,000
Nuclear Generation
Estimated cash outflow for plant costs and related transmission infrastructure costs of nuclear electric generation site	5,400,000,000
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
Number of states required to reduce emissions to attain mandated levels				28
Estimated Delay costs related to New Units	200,000,000
Est Delay cost for new unit	$ 200,000,000
Total Construction Milestones		146
Milestone Schedule Contingency Period		18
Completed Construction Milestones		98
Delayed Construction Milestones		44
Minimum Identified Delay Period		2
Maximum Identified Delay Period		17
PSNC Energy
Environmental
Number of MGP sites requiring cleanup	5