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Employee Benefits
 9 Months Ended
Sep. 30, 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 September 30,
 
U.K.
 
U.S.
 
Other
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
50

 
58

 
33

 
32

 
8

 
12

Expected return on plan assets
(77
)
 
(82
)
 
(38
)
 
(39
)
 
(12
)
 
(15
)
Amortization of net actuarial loss
11

 
13

 
14

 
11

 
2

 
2

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

 
4

 
(2
)
 
(1
)
Curtailment loss (gain) and other
—

 
—

 
—

 
—

 
—

 
—

Total net periodic (benefit) cost
$
(16
)

$
(11
)

$
9


$
4


$
(2
)

$
(1
)


 
Nine months ended September 30,
 
U.K.
 
U.S.
 
Other
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
2

 
$
—

 
$
—

 
$
—

Interest cost
149

 
174

 
99

 
96

 
25

 
36

Expected return on plan assets
(229
)
 
(247
)
 
(115
)
 
(117
)
 
(37
)
 
(45
)
Amortization of net actuarial loss
31

 
40

 
41

 
32

 
8

 
6

Net periodic (benefit) cost
(49
)
 
(33
)
 
27

 
11

 
(4
)
 
(3
)
Curtailment (gain) loss and other
—

 
—

 
(1
)
 
1

 
—

 
(3
)
Total net periodic (benefit) cost
$
(49
)
 
$
(33
)
 
$
26

 
$
12

 
$
(4
)
 
$
(6
)

The Company expected to contribute approximately $65 million, $132 million, and $23 million, based on exchange rates as of December 31, 2014, to its material U.K., U.S., and other significant international pension plans, respectively, during 2015. During the three months ended September 30, 2015, contributions of $16 million, $41 million, and $3 million were made to the Company's material U.K., U.S., and other significant international pension plans, respectively. During the nine months ended September 30, 2015, contributions of $50 million, $103 million, and $11 million were made to the Company's material 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 material 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 material U.K., U.S., and other significant international pension plans, respectively.