Exhibit 10(w) $337,500,000 364-DAY CREDIT AGREEMENT AMONG AON CORPORATION, AS BORROWER, THE LENDERS, BANK ONE, NA, AS LC ISSUER AND AGENT, AND CITIBANK, N.A., AND ABN AMRO BANK N.V. AS SYNDICATION AGENTS DATED AS OF FEBRUARY 5, 2004 BANC ONE CAPITAL...364-Day Credit Agreement • March 11th, 2004 • Aon Corp • Accident & health insurance • Illinois
