CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the Insurer Financial Strength ratings (IFS) of The Chubb Corporation's (NYSE: CB) (Chubb) property/casualty insurance subsidiaries, which are led by Federal Insurance Company (Federal) at 'AA' with a Stable Outlook. Fitch has also placed Chubb's 'AA-' Issuer Default Rating (IDR) and 'A+' senior debt rating on Rating Watch Negative. A full rating list is shown below. KEY RATING DRIVERS Fitch's rating action follows the announcement today that


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