Aon (AON) 10-Q 2009 Q2 Quarterly report

Exhibit 12.2

Aon Corporation and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Combined Fixed Charges

and Preferred Stock Dividends

	Six Months Ended Jun. 30,					Years Ended December 31,
(millions except ratios)	2009		2008			2008		2007			2006		2005		2004
Income from continuing operations before provision for income taxes and noncontrolling interests	$	553	$	485		$	879	$	1,025		$	738	$	567	$	519
Less: Earnings from unconsolidated entities under the equity method of accounting	2		1			5		6			5		7		3
Add back fixed charges:
Interest on indebtedness	55		64			126		138			129		125		136
Interest on FIN 48 liabilities	—		(1		)	—		(2		)	—		—		—
Portion of rents representative of interest factor	20		25			47		75			79		71		73
Income as adjusted	$	626	$	572		$	1,047	$	1,230		$	941	$	756	$	725
Fixed charges and preferred stock dividends:
Interest on indebtedness	$	55	$	64		$	126	$	138		$	129	$	125	$	136
Preferred stock dividends	—		—			—		—			—		3		3
Interest and dividends	55		64			126		138			129		128		139
Portion of rents representative of interest factor	20		25			47		75			79		71		73
Total fixed charges and preferred stock dividends	$	75	$	89		$	173	$	213		$	208	$	199	$	212
Ratio of earnings to combined fixed charges and preferred stock dividends	8.3		6.4			6.1		5.8			4.5		3.8		3.4

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