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Employee Benefits
 3 Months Ended
Mar. 31, 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 March 31,
 
U.K.
 
U.S.
 
Other
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
5

Interest cost
58

 
53

 
32

 
28

 
12

 
11

Expected return on plan assets
(82
)
 
(75
)
 
(39
)
 
(34
)
 
(15
)
 
(15
)
Amortization of net actuarial loss
13

 
12

 
10

 
13

 
2

 
6

Net periodic (benefit) cost
(11
)
 
(10
)
 
3

 
7

 
(1
)
 
7

Curtailment loss (gain) and other
—

 
—

 
1

 
—

 
(3
)
 
—

Total net periodic benefit cost
$
(11
)

$
(10
)

$
4


$
7


$
(4
)

$
7



Based on current assumptions, in 2014, Aon plans to contribute $185 million, $173 million, and $27 million to its 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.