CHICAGO--(BUSINESS WIRE)--Fitch Ratings has assigned a 'BBB' rating to Anadarko Petroleum Corporation's (NYSE: APC) issuance of senior unsecured amortizing notes. Fitch has also affirmed the Issuer Default Ratings (IDRs) for APC and Kerr-McGee, Inc. A full list of rating actions follows at the end of this release. The Rating Outlook is Stable. Approximately $14.3 billion of debt, excluding debt at Western Gas, is affected by today's rating action. TANGIBLE EQUITY UNIT OFFERING The $325 million