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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
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 material U.K., U.S., and other significant international pension plans 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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Interest cost
$
28

 
$
29

 
$
27

 
$
25

 
$
7

 
$
7

Expected return on plan assets, net of administration expenses
(49
)
 
(51
)
 
(34
)
 
(36
)
 
(10
)
 
(12
)
Amortization of prior-service cost
1

 
—

 
1

 
—

 
—

 
—

Amortization of net actuarial loss
7

 
8

 
13

 
15

 
3

 
3

Net periodic (benefit) cost
(13
)
 
(14
)
 
7

 
4

 
—

 
(2
)
Loss on pension settlement
—

 
7

 
—

 
—

 
—

 
—

Total net periodic (benefit) cost
$
(13
)

$
(7
)

$
7


$
4


$
—


$
(2
)