Restructuring (Tables)

9 Months Ended

Sep. 30, 2011

Restructuring

Schedule of restructuring and related expenses by type for Aon Hewitt Restructuring Plan

	2010		Third Quarter 2011		Nine Months 2011		Total Inception to Date		Estimated Total Cost for Restructuring Plan (1)
Workforce reduction	$	49	$	15	$	39	$	88	$	180
Lease consolidation	3		8		33		36		95
Asset impairments	—		3		7		7		47
Other costs associated with restructuring (2)	—		—		1		1		3
Total restructuring and related expenses	$	52	$	26	$	80	$	132	$	325

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this plan.  Significant assumptions likely to change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

Schedule of restructuring and related expenses by type for Aon Benfield Restructuring Plan

	Purchase Price Allocation		2009		2010		Third Quarter 2011			Nine Months 2011			Total Inception to Date		Estimated Total Cost for Restructuring Period (1)
Workforce reduction	$	32	$	38	$	15	$	3		$	14		$	99	$	125
Lease consolidation	20		14		7		(1		)	(17		)	24		26
Asset impairments	—		2		2		—			—			4		4
Other costs associated with restructuring (2)	1		1		2		1			1			5		5
Total restructuring and related expenses	$	53	$	55	$	26	$	3		$	(2	)	$	132	$	160

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this plan.  Significant assumptions likely to change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

Schedule of changes in company's liabilities for its restructuring plans

	Aon Hewitt Plan			Aon Benfield Plan			2007 Plan			Other			Total
Balance at January 1, 2010	$	—		$	45		$	202		$	16		$	263
Assumed Hewitt restructuring liability (1)	43			—			—			—			43
Expensed	52			24			92			—			168
Cash payments	(8		)	(38		)	(178		)	(8		)	(232		)
Foreign exchange translation and other	1			(5		)	(3		)	2			(5		)
Balance at December 31, 2010	88			26			113			10			237
Expensed (2)	73			(2		)	(8		)	—			63
Cash payments	(70		)	(14		)	(45		)	(2		)	(131		)
Foreign exchange translation and other	1			(1		)	6			—			6
Balance at September 30, 2011	$	92		$	9		$	66		$	8		$	175

(1) The Company assumed a $43 million net real estate related restructuring liability in connection with the Hewitt acquisition.

(2) Includes impact of reoccupying previously vacated leased properties.