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Employee Benefits
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits
 
The following table provides the components of the net periodic benefit cost recognized in the Condensed Consolidated Statements of Income in Compensation and benefits for Aon's material U.K., U.S., and other significant international pension plans located in the Netherlands and Canada (in millions):
 
Three months ended March 31,
 
U.K.
 
U.S.
 
Other
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

Interest cost
49

 
58

 
33

 
32

 
8

 
12

Expected return on plan assets
(75
)
 
(82
)
 
(39
)
 
(39
)
 
(12
)
 
(15
)
Amortization of net actuarial loss
10

 
13

 
14

 
10

 
3

 
2

Net periodic (benefit) cost
(16
)
 
(11
)
 
9

 
3

 
(1
)
 
(1
)
Curtailment loss (gain) and other
—

 
—

 
(1
)
 
1

 
—

 
(3
)
Total net periodic (benefit) cost
$
(16
)

$
(11
)

$
8


$
4


$
(1
)

$
(4
)


Based on current assumptions, in 2015, the Company expects to contribute approximately $65 million, $132 million, and $23 million to its U.K., U.S. and other significant international pension plans, respectively. During the three months ended March 31, 2015, contributions of $19 million, $34 million, and $4 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the three months ended March 31, 2014, contributions of $65 million, $40 million, and $12 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.