Aon (AON) 8-K Entry into a Material Definitive Agreement

Exhibit 99.3

Aon Corporation

Segments - Fourth Quarter Continuing Operations

	Fourth Quarter Ended
(millions)	Dec. 31, 2004			Dec. 31, 2003 (1)			Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Transfers		Less: All Other (2)		Organic Revenue Growth (3)
	(Revised)
Revenue
Risk and insurance brokerage services
Risk management and insurance brokerage - Americas	$	622		$	638		(3	)%	1	%	—	%	—	%	(4	)%
Risk management and insurance brokerage - International	638			565			13		7		1		1		4
Reinsurance brokerage and related services	199			192			4		2		—		2		—
Claims services	39			91			(57	)	—		(40	)	—		(17	)
Total risk and insurance brokerage services	1,498			1,486			1		3		(2	)	1		(1	)
Consulting
Benefits, compensation, management and communications consulting	265			251			6		4		—		—		2
Human resource outsourcing	76			78			(3	)	2		—		(1	)	(4	)
Total consulting	341			329			4		3		—		1		—
Insurance underwriting
Accident & health and life	432			402			7		3		—		7		(3	)
Warranty, credit and property & casualty	353			338			4		3		(1	)	1		1
Total insurance underwriting	785			740			6		3		—		4		(1	)
Corporate and other	61			40			53		N/A		N/A		N/A		N/A
Intersegment revenues	(23		)	(19		)	N/A		N/A		N/A		N/A		N/A
Total	$	2,662		$	2,576		3	%	3	%	(1	)%	2	%	(1	)%
Investment income (included in Revenue above)
Risk and insurance brokerage services	$	26		$	17		53	%
Consulting	1			1			—
Insurance underwriting, including deposit-type contracts	34			29			17
Corporate and other	61			40			53
Total	$	122		$	87		40	%
Income (loss) from continuing operations before income tax and minority interest
Risk and insurance brokerage services	$	29		$	239		(88	)%
Consulting	22			47			(53	)
Insurance underwriting	61			11			455
Corporate and other	(2		)	61			N/A
Total	$	110		$	358		(69	)%
Income from continuing operations before income tax - margins
Risk and insurance brokerage services	1.9		%	16.1		%
Consulting	6.5		%	14.3		%
Insurance underwriting	7.8		%	1.5		%
Total	4.1		%	13.9		%

(1)Certain amounts relating to discontinued operations have been reclassified to conform to the 2004 presentation.

(2)Includes the impact of investment income, reimbursable expenses, adjustment between written and earned premium and fees in insurance underwriting only, and unusual items.

(3)Organic revenue growth excludes the impact of foreign exchange, acquisitions, divestitures, transfers and items described in (2).  Written premiums and fees are the basis for organic revenue growth within the Insurance Underwriting segment.