OREANDA-NEWS. A.M. Best has removed from under review with negative implications and downgraded the issuer credit rating (ICR) to “bbb” from “bbb+” of Aetna Inc. (Aetna) (Hartford, CT) [NYSE: AET]. In addition, A.M. Best has downgraded the ICR to “a” from “a+” and affirmed the financial strength ratings (FSR) of A (Excellent) of Aetna Life Insurance Company and other lead operating entities of Aetna.