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Employee Benefits
 6 Months Ended
Jun. 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 June 30,
 
U.K.
 
U.S.
 
Other
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

Interest cost
50

 
58

 
33

 
32

 
9

 
12

Expected return on plan assets
(77
)
 
(83
)
 
(38
)
 
(39
)
 
(13
)
 
(15
)
Amortization of net actuarial loss
10

 
14

 
13

 
11

 
3

 
2

Net periodic (benefit) cost
(17
)
 
(11
)
 
9

 
4

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

 
—

 
—

 
—

 
—

 
—

Total net periodic (benefit) cost
$
(17
)

$
(11
)

$
9


$
4


$
(1
)

$
(1
)


 
Six months ended June 30,
 
U.K.
 
U.S.
 
Other
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
2

 
$
—

 
$
—

 
$
—

Interest cost
99

 
116

 
66

 
64

 
17

 
24

Expected return on plan assets
(152
)
 
(165
)
 
(77
)
 
(78
)
 
(25
)
 
(30
)
Amortization of net actuarial loss
20

 
27

 
27

 
21

 
6

 
4

Net periodic (benefit) cost
(33
)
 
(22
)
 
18

 
7

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

 
—

 
(1
)
 
1

 
—

 
(3
)
Total net periodic (benefit) cost
$
(33
)
 
$
(22
)
 
$
17

 
$
8

 
$
(2
)
 
$
(5
)

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 June 30, 2015, contributions of $15 million, $28 million, and $4 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the six months ended June 30, 2015, contributions of $34 million, $62 million, and $8 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.

During the three months ended June 30, 2014, contributions of $56 million, $33 million, and $4 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the six months ended June 30, 2014, contributions of $121 million, $73 million, and $16 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.