UNITED STATES	
 	SECURITIES AND EXCHANGE COMMISSION	
 	Washington, D.C. 20549	

	
 	 	
 	FORM 8-K	
 	 	
 	CURRENT REPORT	
 	Pursuant to Section 13 or 15(d) of the	
 	Securities Exchange Act of 1934	
 	 	
 	Date of report (Date of earliest event reported): October 29, 2004	

	
 	 	
 	Aon Corporation	
 	(Exact Name of Registrant as Specified in Charter)	
 	 	
Delaware	1-7933	36-3051915	 	
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer
Identification No.)	 	
 	 	 	 	
200 East Randolph Street, Chicago, Illinois	60601	 	
(Address of Principal Executive Offices)	(Zip Code)	 	
 	 	
 	Registrant’s telephone number, including area code: (312) 381-1000	
 	 	
 	Not Applicable	
 	(Former Name or Former Address, if Changed Since Last Report)	

					
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
 
o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
 
o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
 
o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
 
o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 
Item 8.01. Other Events.
                On October 29, 2004, Aon Corporation (the “Company”) issued a press release (the “Press Release”) regarding the status of its credit agreements.
A copy of the Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.
Item 9.01. Financial Statements and Exhibits.
(a)—(b)    Not applicable.
(c)            Exhibits:

Exhibit Number  	 	Description of Exhibit	
 	 	 	
99.1	 	Press Release issued by the Company on October 29, 2004.	
 
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SIGNATURES
 
        Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

 	Aon CORPORATION	
 	 	
 	By:	/s/ David P. Bolger  	
 	 	David P. Bolger	
 	 	Executive Vice President, Chief Financial Officer and	
 	 	Chief Administrative Officer	
 	 	 	
 Date: October 29, 2004	 	 	
 
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EXHIBIT INDEX

Exhibit Number	 	Description of Exhibit	
 	 	 	
99.1	 	Press Release issued by the Company on October 29, 2004.	
 
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Exhibit 99.1

Aon Corporation Updates Comments on Credit Agreements
 
CHICAGO, October 29, 2004 — During an Aon Corporation (NYSE: AOC) earnings call earlier today, a question was asked as to the status of current credit agreements.
 
In a subsequent statement, the company said it has been in contact with its lenders and, based on currently available information, does not believe access to existing credit lines will be impaired as a consequence of the New York Attorney General’s investigation.
 
As of October 29, 2004, the company has approximately $890 million of available undrawn credit lines.
 
Aon Corporation (www.aon.com) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. The company employs approximately 51,000 professionals in its 600 offices in more than 120 countries.  Backed by broad resources, industry knowledge and technical expertise, Aon professionals help a wide range of clients develop effective risk management and workforce productivity solutions.
 
This press release contains certain statements relating to future results, which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995.  These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results, depending on a variety of factors.  Potential factors that could impact results include the general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, exchange rates, rating agency actions, resolution of pending regulatory investigations and related issues, including those related to compensation arrangements with underwriters, pension funding, ultimate paid claims may be different from actuarial estimates and actuarial estimates may change over time, changes in commercial property and casualty markets and commercial premium rates, the competitive environment, the actual costs of resolution of contingent liabilities and other loss contingencies, and the heightened level of potential errors and omissions liability arising from placements of complex policies and sophisticated reinsurance arrangements in an insurance market in which insurer reserves are under pressure.  Further information concerning the Company and its business, including factors that potentially could materially affect the Company’s financial results, is contained in the Company’s filings with the Securities and Exchange Commission.

###
 
Investor Contact: Craig Streem 
                                                Vice President, Investor Relations   
                                                312-381-3983

Media Contact:     Gary Sullivan
                                                Senior Vice President, Corporate Communications
                                                312-381-2467