OLDWICK, N.J.--(BUSINESS WIRE)--AM Best has assigned Long-Term Issue Credit Ratings (Long-Term IR) of “a” (Excellent) to Aflac Incorporated’s (Aflac) (Columbus, GA) [NYSE: AFL] newly issued senior unsecured notes (see detailed list below). The outlook assigned to these Credit Ratings (ratings) is stable. All other ratings of Aflac and its subsidiaries are unchanged. AM Best expects the net proceeds to be used for general corporate purposes. While AM Best expects the debt issuance to have a modest impact on ...