COMMITMENTS AND CONTINGENCIES (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2005
SCEG
Nuclear Insurance
Federal Limit on Public Liability Claims from Nuclear Incident Approximate	$ 12,600,000,000
Maximum Insurance Coverage for each Nuclear Plant by ANI	375,000,000
Maximum liability assessment per reactor for each nuclear incident	117,500,000	78,300,000
Maximum Federal Limit on Public Liability Claims Per Incident for Each Year	11,700,000
Maximum yearly assessment per reactor	17,500,000
Inflation adjustment period for nuclear insurance	5
Maximum retrospective insurance premium per nuclear incident	40,600,000
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 covered by insurance for a single 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	21,900,000
Deferred costs net of costs previously recovered through rates and insurance settlements included in regulatory assets	37,900,000
Nuclear Generation
Estimated cash outflow for plant costs and related transmission infrastructure costs of nuclear electric generation site	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
PSNC Energy
Environmental
Number of MGP sites requiring cleanup	5