8-K

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): August 4, 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)

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

(a)    (b)   Not applicable.

(c)Exhibits:

The following exhibits are furnished as part of this report:

Exhibit Number	Description of Exhibit
99.1	Consolidated Summary of Operations – Reclassified for Discontinued Operations for  (i) the quarter ended March 31, 2004, (ii) the quarters ended March 31, June 30, September 30 and December 31, 2003, 2002, 2001 and 2000 and  (iii) the years ended December 31, 2003, 2002, 2001 and 2000.
99.2	Segments-Reclassified for Discontinued Operations for  (i) the quarter ended March 31, 2004, (ii) the quarters ended March 31, June 30, September 30 and December 31, 2003, 2002, 2001 and 2000 and  (iii) the years ended December 31, 2003, 2002, 2001 and 2000.

Item 9.  Regulation FD Disclosure.

This supplemental information is being furnished to assist investors in analyzing the Company’s historical 2004, 2003, 2002, 2001 and 2000 financial information compared to the second quarter and six months 2004 presentation, which added a reinsurance brokerage runoff unit to discontinued operations.

On August 5, 2004, a Current Report on Form 8-K (the “August 5 Form 8-K”) was filed in conjunction with the release of second quarter and six months 2004 financial results that included a quarterly and full year consolidated summary of operations for the year ended December 31, 2003 and the quarter ended March 31, 2004, reclassified for discontinued operations.  This Form 8-K filing supplements the August 5 Form 8-K by adding reclassified information for each quarter as well as full years ended December 31, 2002, 2001 and 2000, and is attached as Exhibit 99.1.

The August 5 Form 8-K also included segment information reclassified for discontinued operations for each quarter and full year ended December 31, 2003 and the quarter ended March 31, 2004. This Form 8-K filing supplements the August 5 Form 8-K by adding reclassified information for each quarter as well as full years ended December 31, 2002, 2001 and 2000, and is attached as Exhibit 99.2.

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 and Chief Financial Officer
Date: August 4, 2004

2

EXHIBIT INDEX

The following is a list of the exhibits furnished with this Current Report on Form 8-K.

Exhibit Number	Description of Exhibit
99.1	Consolidated Summary of Operations – Reclassified for Discontinued Operations for  (i) the quarter ended March 31, 2004, (ii) the quarters ended March 31, June 30, September 30 and December 31, 2003, 2002, 2001 and 2000 and  (iii) the years ended December 31, 2003, 2002, 2001 and 2000.
99.2	Segments-Reclassified for Discontinued Operations for  (i) the quarter ended March 31, 2004, (ii) the quarters ended March 31, June 30, September 30 and December 31, 2003, 2002, 2001 and 2000 and  (iii) the years ended December 31, 2003, 2002, 2001 and 2000.

3

EX-99.1

Exhibit 99.1

Aon Corporation

Consolidated Summary of Operations - Reclassified for Discontinued Operations

	2003															2004
(millions except per share data)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year			1st Quarter
Revenue
Brokerage commissions and fees	$	1,653		$	1,688		$	1,639		$	1,822		$	6,802		$	1,792
Premiums and other	632			635			673			669			2,609			692
Investment income	79			89			57			87			312			81
Total revenue	2,364			2,412			2,369			2,578			9,723			2,565
Expenses
General expenses	1,672			1,776			1,719			1,851			7,018			1,835
Benefits to policyholders	345			325			367			390			1,427			383
Interest expense	28			27			24			22			101			34
Amortization of intangible assets	13			15			18			17			63			14
Unusual charges (credits) - World Trade Center	37			9			—			(60		)	(14		)	—
Total expenses	2,095			2,152			2,128			2,220			8,595			2,266
Income from continuing operations before income tax and minority interest	269			260			241			358			1,128			299
Provision for income tax	99			96			90			133			418			108
Income from continuing operations before minority interest	170			164			151			225			710			191
Minority interest - 8.205% trust preferred capital securities	(9		)	(9		)	(9		)	(9		)	(36		)	—
Income from continuing operations	161			155			142			216			674			191
Discontinued operations
Loss from discontinued operations	(13		)	(15		)	(43		)	(2		)	(73		)	(27		)
Income tax benefit	(4		)	(6		)	(16		)	(1		)	(27		)	(6		)
Loss from discontinued operations, net of tax	(9		)	(9		)	(27		)	(1		)	(46		)	(21		)
Net income	$	152		$	146		$	115		$	215		$	628		$	170
Preferred stock dividends	(1		)	—			(1		)	(1		)	(3		)	(1		)
Net income available for common stockholders	$	151		$	146		$	114		$	214		$	625		$	169
Basic net income per share:
Income from continuing operations	$	0.51		$	0.49		$	0.45		$	0.67		$	2.12		$	0.60
Discontinued operations	(0.03		)	(0.03		)	(0.09		)	—			(0.15		)	(0.07		)
Net income	$	0.48		$	0.46		$	0.36		$	0.67		$	1.97		$	0.53
Dilutive net income per share:
Income from continuing operations	$	0.51		$	0.49		$	0.44		$	0.67		$	2.11		$	0.59
Discontinued operations	(0.03		)	(0.03		)	(0.08		)	—			(0.14		)	(0.06		)
Net income	$	0.48		$	0.46		$	0.36		$	0.67		$	1.97		$	0.53
Dilutive average common and common equivalent shares outstanding	315.2			318.2			318.6			319.3			317.8			321.3

	2002
(millions except per share data)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Brokerage commissions and fees	$	1,420		$	1,485		$	1,527		$	1,670		$	6,102
Premiums and other	535			638			607			588			2,368
Investment income (loss)	109			(26		)	87			81			251
Total revenue	2,064			2,097			2,221			2,339			8,721
Expenses
General expenses	1,430			1,637			1,616			1,677			6,360
Benefits to policyholders	314			391			350			320			1,375
Interest expense	29			30			32			33			124
Amortization of intangible assets	11			14			13			16			54
Unusual credits - World Trade Center	—			—			(18		)	(11		)	(29		)
Total expenses	1,784			2,072			1,993			2,035			7,884
Income from continuing operations before income tax and minority interest	280			25			228			304			837
Provision for income tax	104			9			84			112			309
Income from continuing operations before minority interest	176			16			144			192			528
Minority interest - 8.205% trust preferred capital securities	(10		)	(10		)	(10		)	(4		)	(34		)
Income from continuing operations	166			6			134			188			494
Discontinued operations
Loss from discontinued operations	(9		)	(9		)	(11		)	(15		)	(44		)
Income tax benefit	(3		)	(3		)	(5		)	(5		)	(16		)
Loss from discontinued operations, net of tax	(6		)	(6		)	(6		)	(10		)	(28		)
Net income	$	160		$	—		$	128		$	178		$	466
Preferred stock dividends	(1		)	—			(1		)	(1		)	(3		)
Net income available for common stockholders	$	159		$	—		$	127		$	177		$	463
Basic net income per share:
Income from continuing operations	$	0.60		$	0.02		$	0.48		$	0.62		$	1.75
Discontinued operations	(0.02		)	(0.02		)	(0.02		)	(0.03		)	(0.10		)
Net income	$	0.58		$	—		$	0.46		$	0.59		$	1.65
Dilutive net income per share:
Income from continuing operations	$	0.59		$	0.02		$	0.48		$	0.62		$	1.74
Discontinued operations	(0.02		)	(0.02		)	(0.02		)	(0.03		)	(0.10		)
Net income	$	0.57		$	—		$	0.46		$	0.59		$	1.64
Dilutive average common and common equivalent shares outstanding	276.6			278.0			277.1			299.0			282.6

	2001
(millions except per share data)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Brokerage commissions and fees	$	1,273		$	1,334		$	1,284		$	1,499		$	5,390
Premiums and other	508			492			510			517			2,027
Investment income	21			78			105			7			211
Total revenue	1,802			1,904			1,899			2,023			7,628
Expenses
General expenses	1,347			1,505			1,365			1,492			5,709
Benefits to policyholders	292			260			271			288			1,111
Interest expense	36			31			31			29			127
Amortization of intangible assets	39			39			40			40			158
Unusual charges - World Trade Center	—			—			53			105			158
Total expenses	1,714			1,835			1,760			1,954			7,263
Income from continuing operations before income tax and minority interest	88			69			139			69			365
Provision for income tax	35			27			53			29			144
Income from continuing operations before minority interest	53			42			86			40			221
Minority interest - 8.205% trust preferred capital securities	(10		)	(10		)	(10		)	(10		)	(40		)
Income from continuing operations	43			32			76			30			181
Discontinued operations
Loss from discontinued operations	(40		)	(5		)	(6		)	(5		)	(56		)
Income tax benefit	(16		)	(2		)	(2		)	(2		)	(22		)
Loss from discontinued operations, net of tax	(24		)	(3		)	(4		)	(3		)	(34		)
Net income	$	19		$	29		$	72		$	27		$	147
Preferred stock dividends	(1		)	—			(1		)	(1		)	(3		)
Net income available for common stockholders	$	18		$	29		$	71		$	26		$	144
Basic net income per share:
Income from continuing operations	$	0.16		$	0.12		$	0.27		$	0.11		$	0.67
Discontinued operations	(0.09		)	(0.01		)	(0.01		)	(0.01		)	(0.13		)
Net income	$	0.07		$	0.11		$	0.26		$	0.10		$	0.54
Dilutive net income per share:
Income from continuing operations	$	0.16		$	0.12		$	0.27		$	0.11		$	0.65
Discontinued operations	(0.09		)	(0.01		)	(0.01		)	(0.01		)	(0.12		)
Net income	$	0.07		$	0.11		$	0.26		$	0.10		$	0.53
Dilutive average common and common equivalent shares outstanding	267.9			270.2			275.4			276.9			272.4

	2000
(millions except per share data)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Brokerage commissions and fees	$	1,191		$	1,190		$	1,164		$	1,349		$	4,894
Premiums and other	468			491			476			486			1,921
Investment income	136			124			132			112			504
Total revenue	1,795			1,805			1,772			1,947			7,319
Expenses
General expenses	1,258			1,250			1,196			1,438			5,142
Benefits to policyholders	252			257			257			271			1,037
Interest expense	31			33			38			38			140
Amortization of intangible assets	38			39			38			39			154
Total expenses	1,579			1,579			1,529			1,786			6,473
Income from continuing operations before income tax and minority interest	216			226			243			161			846
Provision for income tax	84			88			95			63			330
Income from continuing operations before minority interest	132			138			148			98			516
Minority interest - 8.205% trust preferred capital securities	(10		)	(10		)	(10		)	(10		)	(40		)
Income from continuing operations	122			128			138			88			476
Discontinued operations
Income from discontinued operations	2			2			1			3			8
Income tax provision	1			1			—			1			3
Income from discontinued operations, net of tax	1			1			1			2			5
Cumulative effect of change in accounting principle, net of tax	(7		)	—			—			—			(7		)
Net income	$	116		$	129		$	139		$	90		$	474
Preferred stock dividends	(1		)	—			(1		)	(1		)	(3		)
Net income available for common stockholders	$	115		$	129		$	138		$	89		$	471
Basic net income per share:
Income from continuing operations	$	0.46		$	0.50		$	0.53		$	0.33		$	1.82
Discontinued operations	0.01			—			—			0.01			0.02
Cumulative effect of change in accounting principle	(0.03		)	—			—			—			(0.03		)
Net income	$	0.44		$	0.50		$	0.53		$	0.34		$	1.81
Dilutive net income per share:
Income from continuing operations	$	0.46		$	0.49		$	0.53		$	0.32		$	1.80
Discontinued operations	0.01			—			—			0.01			0.02
Cumulative effect of change in accounting principle	(0.03		)	—			—			—			(0.03		)
Net income	$	0.44		$	0.49		$	0.53		$	0.33		$	1.79
Dilutive average common and common equivalent shares outstanding	260.5			261.7			262.8			267.0			263.0

EX-99.2

Exhibit 99.2

Aon Corporation

Segments - Reclassified for Discontinued Operations

	2003															2004
(millions)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year			1st Quarter
Revenue
Risk & Insurance Brokerage Services:
Risk Management & Insurance Brokerage - Americas	$	507		$	590		$	562		$	640		$	2,299		$	532
Risk Management & Insurance Brokerage - International	524			507			478			565			2,074			633
Reinsurance Brokerage & Related Services	237			219			225			192			873			239
Claims Services	88			88			85			91			352			61
Total Risk & Insurance Brokerage Services	1,356			1,404			1,350			1,488			5,598			1,465
Consulting:
Benefits, Compensation, Management & Communications Consulting	209			224			214			251			898			225
Human Resource Outsourcing	71			68			70			78			287			76
Total Consulting	280			292			284			329			1,185			301
Insurance Underwriting:
Accident & Health and Life	399			377			416			402			1,594			425
Warranty, Credit and Property & Casualty	310			315			326			338			1,289			356
Total Insurance Underwriting	709			692			742			740			2,883			781
Corporate & Other	31			40			14			40			125			36
Intersegment Revenues	(12		)	(16		)	(21		)	(19		)	(68		)	(18		)
Total	$	2,364		$	2,412		$	2,369		$	2,578		$	9,723		$	2,565
Income (loss) from continuing operations before income tax and minority interest
Risk & Insurance Brokerage Services	$	235		$	180		$	191		$	239		$	845		$	242
Consulting	21			22			20			47			110			26
Insurance Underwriting	63			64			58			11			196			53
Corporate & Other	(50		)	(6		)	(28		)	61			(23		)	(22		)
Total	$	269		$	260		$	241		$	358		$	1,128		$	299
Income from continuing operations before income tax - margins
Risk & Insurance Brokerage Services	17.3		%	12.8		%	14.1		%	16.1		%	15.1		%	16.5		%
Consulting	7.5		%	7.5		%	7.0		%	14.3		%	9.3		%	8.6		%
Insurance Underwriting	8.9		%	9.2		%	7.8		%	1.5		%	6.8		%	6.8		%
Total	11.4		%	10.8		%	10.2		%	13.9		%	11.6		%	11.7		%

	2002
(millions)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Risk & Insurance Brokerage Services:
Risk Management & Insurance Brokerage - Americas	$	448		$	517		$	534		$	607		$	2,106
Risk Management & Insurance Brokerage - International	420			413			403			459			1,695
Reinsurance Brokerage & Related Services	194			186			204			181			765
Claims Services	77			80			87			85			329
Total Risk & Insurance Brokerage Services	1,139			1,196			1,228			1,332			4,895
Consulting:
Benefits, Compensation, Management & Communications Consulting	183			194			193			226			796
Human Resource Outsourcing	48			52			74			76			250
Total Consulting	231			246			267			302			1,046
Insurance Underwriting:
Accident & Health and Life	389			441			415			394			1,639
Warranty, Credit and Property & Casualty	260			309			303			290			1,162
Total Insurance Underwriting	649			750			718			684			2,801
Corporate & Other	45			(95		)	8			21			(21		)
Total	$	2,064		$	2,097		$	2,221		$	2,339		$	8,721
Income (loss) from continuing operations before income tax and minority interest
Risk & Insurance Brokerage Services	$	192		$	146		$	212		$	252		$	802
Consulting	27			24			26			45			122
Insurance Underwriting	68			2			41			44			155
Corporate & Other	(7		)	(147		)	(51		)	(37		)	(242		)
Total	$	280		$	25		$	228		$	304		$	837
Income from continuing operations before income tax - margins
Risk & Insurance Brokerage Services	16.9		%	12.2		%	17.3		%	18.9		%	16.4		%
Consulting	11.7		%	9.8		%	9.7		%	14.9		%	11.7		%
Insurance Underwriting	10.5		%	0.3		%	5.7		%	6.4		%	5.5		%
Total	13.6		%	1.2		%	10.3		%	13.0		%	9.6		%

	2001
(millions)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Risk & Insurance Brokerage Services:
Risk Management & Insurance Brokerage - Americas	$	423		$	480		$	441		$	576		$	1,920
Risk Management & Insurance Brokerage - International	375			342			322			374			1,413
Reinsurance Brokerage & Related Services	170			169			169			142			650
Claims Services	79			90			93			100			362
Total Risk & Insurance Brokerage Services	1,047			1,081			1,025			1,192			4,345
Consulting:
Benefits, Compensation, Management & Communications Consulting	169			181			180			210			740
Human Resource Outsourcing	43			47			50			53			193
Total Consulting	212			228			230			263			933
Insurance Underwriting:
Accident & Health and Life	348			354			357			370			1,429
Warranty, Credit and Property & Casualty	280			255			284			273			1,092
Total Insurance Underwriting	628			609			641			643			2,521
Corporate & Other	(85		)	(14		)	3			(75		)	(171		)
Total	$	1,802		$	1,904		$	1,899		$	2,023		$	7,628
Income (loss) from continuing operations before income tax and minority interest
Risk & Insurance Brokerage Services	$	165		$	79		$	141		$	176		$	561
Consulting	24			24			29			50			127
Insurance Underwriting	68			60			45			(5		)	168
Corporate & Other	(169		)	(94		)	(76		)	(152		)	(491		)
Total	$	88		$	69		$	139		$	69		$	365
Income (loss) from continuing operations before income tax - margins
Risk & Insurance Brokerage Services	15.8		%	7.3		%	13.8		%	14.8		%	12.9		%
Consulting	11.3		%	10.5		%	12.6		%	19.0		%	13.6		%
Insurance Underwriting	10.8		%	9.9		%	7.0		%	-0.8		%	6.7		%
Total	4.9		%	3.6		%	7.3		%	3.4		%	4.8		%

	2000
(millions)	1st Quarter			2nd Quarter			3rd Quarter			4th Quarter			Full Year
Revenue
Risk & Insurance Brokerage Services:
Risk Management & Insurance Brokerage - Americas	$	420		$	456		$	448		$	544		$	1,868
Risk Management & Insurance Brokerage - International	370			332			301			332			1,335
Reinsurance Brokerage & Related Services	153			145			159			153			610
Claims Services	60			61			63			68			252
Total Risk & Insurance Brokerage Services	1,003			994			971			1,097			4,065
Consulting:
Benefits, Compensation, Management & Communications Consulting	143			147			148			198			636
Human Resource Outsourcing	33			33			34			34			134
Total Consulting	176			180			182			232			770
Insurance Underwriting:
Accident & Health and Life	319			323			330			349			1,321
Warranty, Credit and Property & Casualty	267			286			264			275			1,092
Total Insurance Underwriting	586			609			594			624			2,413
Corporate & Other	30			22			25			(6		)	71
Total	$	1,795		$	1,805		$	1,772		$	1,947		$	7,319
Income (loss) from continuing operations before income tax and minority interest
Risk & Insurance Brokerage Services	$	177		$	177		$	178		$	125		$	657
Consulting	19			23			26			38			106
Insurance Underwriting	68			82			85			90			325
Corporate & Other	(48		)	(56		)	(46		)	(92		)	(242		)
Total	$	216		$	226		$	243		$	161		$	846
Income from continuing operations before income tax - margins
Risk & Insurance Brokerage Services	17.6		%	17.8		%	18.3		%	11.4		%	16.2		%
Consulting	10.8		%	12.8		%	14.3		%	16.4		%	13.8		%
Insurance Underwriting	11.6		%	13.5		%	14.3		%	14.4		%	13.5		%
Total	12.0		%	12.5		%	13.7		%	8.3		%	11.6		%