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Employee Benefits
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits
 
The following table provides the components of the net periodic benefit cost for Aon's material U.K., U.S., and other significant international pension plans, which are located in the Netherlands and Canada (in millions):
 
Three months ended September 30,
 
U.K.
 
U.S.
 
Other
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
5

Interest cost
58

 
52

 
32

 
28

 
12

 
11

Expected return on plan assets
(82
)
 
(74
)
 
(39
)
 
(34
)
 
(15
)
 
(15
)
Amortization of net actuarial loss
13

 
12

 
11

 
13

 
2

 
6

Total net periodic (benefit) cost
$
(11
)

$
(10
)

$
4


$
7


$
(1
)

$
7



 
Nine months ended September 30,
 
U.K.
 
U.S.
 
Other
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
14

Interest cost
174

 
156

 
96

 
84

 
36

 
33

Expected return on plan assets
(247
)
 
(223
)
 
(117
)
 
(103
)
 
(45
)
 
(44
)
Amortization of net actuarial loss
40

 
36

 
32

 
39

 
6

 
19

Net periodic (benefit) cost
(33
)
 
(31
)
 
11

 
20

 
(3
)
 
22

Curtailment loss (gain) and other
—

 
—

 
1

 
—

 
(3
)
 
—

Total net periodic (benefit) cost
$
(33
)
 
$
(31
)
 
$
12

 
$
20

 
$
(6
)
 
$
22




Based on current assumptions, in 2014, Aon plans to contribute $183 million, $173 million, and $29 million to its U.K., U.S. and other significant international pension plans, respectively. During the three months ended September 30, 2014, contributions of $24 million, $39 million, and $7 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the nine months ended September 30, 2014, contributions of $145 million, $112 million, and $23 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.

During the three months ended September 30, 2013, contributions of $54 million, $54 million, and $5 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the nine months ended September 30, 2013, contributions of $241 million, $122 million, and $49 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.