CHICAGO–(BUSINESS WIRE)–Fitch Ratings has assigned an ‘A-(EXP)’ rating to UnitedHealth Group Incorporated’s (UNH) planned benchmark offering of senior unsecured notes in a mix of 10 and 30 year maturities. Fitch expects the issuance to be between $1.0 billion and $1.5 billion. The ratings are equivalent to Fitch’s ratings on UNH’s outstanding senior unsecured notes. UNH’s ‘A’ Issuer Default Rating (IDR) Outlook is currently Negative. Fitch anticipates UNH using proceeds from the planned issua