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

Exhibit 99.5

Aon Corporation

Corporate and Other - Continuing Operations

	Fourth Quarter Ended								Twelve Months Ended
(millions)	Dec. 31, 2004			Dec. 31, 2003			Percent Change		Dec. 31, 2004			Dec. 31, 2003			Percent Change
Revenue
Income from marketable equity securities and other investments (1)	$	13		$	36		(64	)%	$	49		$	137		(64	)%
Limited partnership investments	—			—			—		6			1			500
Net gain (loss) on disposals and related expenses (2)	48			4			+500		54			(13		)	N/A
Total revenue	61			40			53		109			125			(13	)
Expenses
General expenses	28			17			65		81			61			33
Interest expense (3)	35			22			59		136			101			35
Unusual credits - World Trade Center	—			(60		)	N/A		—			(14		)	N/A
Total expenses	63			(21		)	N/A		217			148			47
Income (loss) before income tax	$	(2	)	$	61		N/A	%	$	(108	)	$	(23	)	N/A	%

Notes:

	Fourth Quarter Ended								Twelve Months Ended
	Dec. 31, 2004			Dec. 31, 2003			Percent Change		Dec. 31, 2004			Dec. 31, 2003			Percent Change
(1)  Includes (millions):
Income from Endurance warrants	$	9		$	16		(44	)%	$	—		$	80		(100	)%
Equity earnings - Endurance	—			18			(100	)	38			46			(17	)
Total	$	9		$	34		(74	)%	$	38		$	126		(70	)%
(2)  Includes (millions):
Gain on sale of Endurance stock	$	37		$	—		N/A	%	$	48		$	—		N/A	%
Impairment writedowns	(1		)	(2		)	N/A		(3		)	(36		)	N/A

(3)  Upon the adoption of FIN 46 on December 31, 2003, Aon was required to deconsolidate its trust preferred capital securities, which was offset by an increase in notes payable. Interest expense for fourth quarter and twelve months 2004 includes $15 million and $58 million, respectively, on these notes payable.