NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded the Issuer Default Rating (IDR) of Duke Energy Carolinas (DEC) to 'A' from 'A-' and revised the Rating Outlook to Stable from Positive. Fitch also affirmed the IDRs of Duke Energy Corp. (DUK) and its other operating utilities as follows: Duke Energy Progress, LLC (DEP) at 'A-'; and DUK, Duke Energy Florida, LLC (DEF), Duke Energy Indiana, LLC (DEI), Duke Energy Ohio, LLC (DEO) and Duke Energy Kentucky, LLC (DEK) at 'BBB+'. Fitch also revised