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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit costs for 2018 and 2017 are as follows:
 
Three Months Ended
March 31
 
2018
 
2017
 
(Millions of dollars)
Pension Benefits
 
 
 
United States
 
 
 
Service cost
$
120

 
$
122

Interest cost
92

 
91

Expected return on plan assets
(159
)
 
(149
)
Amortization of prior service credits
1

 
(1
)
Amortization of actuarial losses
76

 
85

Settlement losses
66

 
78

Total United States
196

 
226

International
 
 
 
Service cost
40

 
37

Interest cost
46

 
53

Expected return on plan assets
(66
)
 
(58
)
Amortization of prior service costs
2

 
3

Amortization of actuarial losses
11

 
9

Settlement losses
—

 
—

Total International
33

 
44

Net Periodic Pension Benefit Costs
$
229

 
$
270

Other Benefits*
 
 
 
Service cost
$
13

 
$
8

Interest cost
21

 
23

Amortization of prior service costs
(7
)
 
(7
)
Amortization of actuarial losses
4

 
(1
)
Net Periodic Other Benefit Costs
$
31

 
$
23

___________________________________
* Includes costs for U.S. and international OPEB plans. Obligations for plans outside the United States are not significant relative to the company’s total OPEB obligation.