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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost for the pension plans
The following table provides the components of the net periodic (benefit) cost recognized in the Condensed Consolidated Statements of Income for Aon’s significant U.K., U.S., and other major pension plans, which are located in the Netherlands and Canada. Service cost is reported in Compensation and benefits and all other components are reported in Other income (expense) as follows (in millions):
 
Three Months Ended March 31,
 
U.K.
 
U.S.
 
Other
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost
$

 
$

 
$

 
$

 
$

 
$

Interest cost
22

 
28

 
21

 
27

 
4

 
7

Expected return on plan assets, net of administration expenses
(39
)
 
(49
)
 
(33
)
 
(34
)
 
(8
)
 
(10
)
Amortization of prior-service cost

 
1

 

 
1

 

 

Amortization of net actuarial loss
7

 
7

 
17

 
13

 
3

 
3

Total net periodic (benefit) cost
$
(10
)
 
$
(13
)
 
$
5

 
$
7

 
$
(1
)
 
$


Schedule of employer's contributions The following table summarizes contributions made to the Company’s significant pension plans (in millions):
 
 
Three Months Ended March 31,
 
 
2020
 
2019
Contributions to U.K. pension plans
 
$
2

 
$
23

Contributions to U.S. pension plans
 
31

 
17

Contributions to other major pension plans
 
2

 
7

Total contributions
 
$
35

 
$
47