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For immediate release 
Aon Completes Merger with Hewitt Associates 
Introducing the worlds premier human capital solutions firm 
 
Aon Corporation (NYSE:AON) announced on October 1, 2010 that it completed its merger of Hewitt 
Associates, Inc. with a subsidiary of Aon, creating Aon Hewitt, the worlds premier human capital solutions 
firm.  
The completion of this merger marks yet another important milestone in the history of Aon and is an industry-
changing event that will create new standards in the human capital space, said Greg Case, president and 
chief executive officer of Aon. Through Aon Hewitt, we will provide our clients with a broader portfolio of 
innovative products and services focused on what we believe are two of the most important topics facing 
todays global economy  risk and people. 
Russ Fradin, chairman and chief executive officer of Aon Hewitt, added, As Aon Hewitt, we are a stronger, 
more global industry leader, bringing innovative solutions and insights to organisations wherever they do 
business. Our focus remains constantto serve clients exceptionally well every day. Clients can be confident 
Aon Hewitt has the expertise and experience to serve as a true partner, helping them with their most pressing 
business challenges. 
Aon believes Aon Hewitt creates a global leader in human capital solutions and services, benefiting clients, 
colleagues and stockholders in several ways, including: 
 
Aon Hewitt revenues of $4.3 billion and 29,000 colleagues globally. Combined revenues for 
fiscal year 2009 consist of 49% from consulting services, 40% from benefits administration 
and 11% from HR business process outsourcing, creating more resources for colleagues and 
more opportunities to distinctively serve clients with capabilities in greater than 120 countries 
around the world; 
 
Leading global brand and client service recognition worldwide. Premier Hewitt brand will be 
leveraged along with Aons client recognition to be leading employee benefits consulting firm; 
 
Complementary product and service portfolio across consulting, benefits administration and 
HR business process outsourcing. Product portfolio will provide for significant cross-sell 
opportunities including the marketing of Hewitts benefits administration and HR business 
process outsourcing services to Aons clients, as well as the marketing of Aons industry-
leading risk services product portfolio to Hewitts clients; 
 
Diversified presence across large corporate and middle market. The combined client base will 
provide significant cross-sell opportunities to leverage Hewitts predominantly large corporate 
client base with Aons predominantly middle market client base; 
 
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Cost savings and operational efficiencies. The transaction is expected to generate 
approximately $355 million in annual cost savings across Aon Hewitt in 2013, primarily from 
reduction in back-office areas, public company costs, management overlap and leverage of 
technology platforms; 
 
Expect to achieve a long-term operating margin in Aon Hewitt of 20%. Primarily through 
anticipated synergies and greater economies of scale, Aon Hewitt expects to deliver improved 
operational performance and a long-term operating margin of 20%;  
 
Expect to create $1.5 billion of stockholder value. Strong cash flow generation of Hewitt, 
combined with expected synergies from the combination, are expected to deliver $1.5 billion 
of value creation for stockholders on a discounted cash flow basis, after subtracting the 
purchase price of the transaction. 
-ENDS- 
Contact: Frances Denny 
Marketing Manager ANZ,  
Aon Hewitt  
02-9101-9042 
frances.denny@aonhewitt.com  
 
About Aon Hewitt  
Aon Hewitt is the global leader in human capital consulting and outsourcing solutions.  The company partners 
with organisations to solve their most complex benefits, talent and related financial challenges, and improve 
business performance.  Aon Hewitt designs, implements, communicates and administers a wide range of 
human capital, retirement, investment management, health care, compensation and talent management 
strategies.  With more than 29,000 professionals in 90 countries, Aon Hewitt makes the world a better place 
to work for clients and their employees.  For more information on Aon Hewitt, please visit