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PENDING MERGER WITH FORTIS INC.	12 Months Ended
PENDING MERGER WITH FORTIS INC.	Dec. 31, 2013
Business Combinations [Abstract]
PENDING MERGER WITH FORTIS INC.	PENDING MERGER WITH FORTIS On December 11, 2013, UNS Energy announced that it had entered into an agreement and plan of merger, subject to shareholder and required regulatory approvals, to be acquired by Fortis for $60.25 per share of Common Stock in cash. Following the merger, UNS Energy will continue as a wholly owned subsidiary of Fortis. The Board of Directors of each of UNS Energy and Fortis Parent have approved the merger.