CHICAGO--(BUSINESS WIRE)--Fitch Ratings has assigned an 'A-' rating to AT&T Inc.'s (AT&T) note offering of six tranches of senior unsecured debt. The Rating Outlook is Stable. Proceeds from this offering are expected to be used for general corporate purposes, including funding the cash consideration of previously announced acquisitions (including DIRECTV). If the DIRECTV acquisition is not completed on or prior to Nov. 30, 2015, or if it is terminated prior to that date, all notes exclu