Employee Benefits

3 Months Ended

Mar. 31, 2012

Employee Benefits

Employee Benefits

11.   Employee Benefits

The following table provides the components of the net periodic benefit cost for Aon’s U.S. pension plans, along with the most significant international defined benefit pension plans, which are located in the U.K., the Netherlands, and Canada (in millions):

	Three months ended March 31,
	U.S.						International
	2012			2011			2012			2011
Service cost	$	—		$	—		$	4		$	5
Interest cost	30			30			66			66
Expected return on plan assets	(32		)	(30		)	(80		)	(71		)
Amortization of net actuarial loss	11			8			14			13
Net periodic benefit cost	$	9		$	8		$	4		$	13

Based on current assumptions, during 2012, the Company plans to contribute $237 million and $304 million to its U.S. and most significant international defined benefit pension plans, respectively. During the first quarter 2012, contributions of $18 million have been made to the Company’s U.S. defined benefit pension plans and $105 million have been made to its most significant international defined benefit pension plans.