Aon Corporation is a holding company whose operating subsidiaries carry onbusiness in three distinct segments: insurance brokerage and other services; consulting; and insurance underwriting. The Insurance Brokerage and Other Services segment consists of its retail and reinsurance brokerage operations. The Consulting segment provides consulting services including employee benefits, human resources, and change management. Its Insurance Underwriting segment sells life and accident and health insurance, extended warranty, specialty and other insurance products.