Chubb engages in the global underwriting business of property and casualty insurance. It provides commercial property insurance, liability insurance, personal accident insurance, and supplemental medical insurance to large multinational corporations, small-to-medium commercial entities, and high-net-worth individuals. The company uses actuarial models to assess risks and set policy terms. Daily operations rely on collecting periodic premiums from policyholders and investing the float in fixed-income markets to generate investment returns.