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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of net benefit costs
 
U.S. Pension 
Benefits
 
Non-U.S. Pension 
Benefits
 
Other
Postretirement 
Benefits
(Millions of dollars)

March 31
 
March 31
 
March 31
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
For the three months ended:
 
 
 
 
 
 
 
 
 
 
 
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
29

 
$
32

 
$
21

 
$
22

 
$
20

 
$
21

Interest cost
150

 
133

 
23

 
25

 
34

 
31

Expected return on plan assets
(181
)
 
(202
)
 
(37
)
 
(56
)
 
(5
)
 
(8
)
Amortization of prior service cost (credit)
—

 
—

 
—

 
—

 
(10
)
 
(9
)
Net periodic benefit cost (benefit) 1
$
(2
)
 
$
(37
)
 
$
7

 
$
(9
)
 
$
39

 
$
35

 
 
 
 
 
 
 
 
 
 
 
 

1 
The service cost component of net periodic pension and other postretirement benefits cost (benefit) is included in Operating costs in the Consolidated Statement of Results of Operations. All other components of net periodic pension and other postretirement benefits cost (benefit) are included in Other income (expense) in the Consolidated Statement of Results of Operations.
 
 
 
 
 
Company costs related to U.S. and non-U.S. defined contribution plans
Total company costs related to our defined contribution plans were as follows:
 
 
 
 
 
 
Three Months Ended March 31
(Millions of dollars)
2019
 
2018
U.S. Plans
$
137

 
$
73

Non-U.S. Plans
21

 
22

 
$
158

 
$
95