 OLDWICK, N.J.--BUSINESS WIRE--AM Best has affirmed the Financial Strength Rating FSR of A Excellent and the Long-Term Issuer Credit Ratings Long-Term ICR of a Excellent of the propertycasualty PC subsidiaries of CNA Financial Corporation CNAF NYSE: CNA, collectively known as CNA Insurance Companies CNA. Concurrently, AM Best has affirmed the Long-Term ICR of bbb Good and all existing Long-Term Issue Credit Ratings Long-Term IR of CNAF. Additionally, AM Best has aff 