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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost The components of net periodic benefit costs for 2019 and 2018 are as follows:
 
Three Months Ended
March 31
 
2019
 
2018
 
(Millions of dollars)
Pension Benefits
 
 
 
United States
 
 
 
Service cost
$
101

 
$
120

Interest cost
99

 
92

Expected return on plan assets
(141
)
 
(159
)
Amortization of prior service costs (credits)
—

 
1

Amortization of actuarial losses (gains)
60

 
76

Settlement losses
60

 
66

Total United States
179

 
196

International
 
 
 
Service cost
35

 
40

Interest cost
51

 
46

Expected return on plan assets
(58
)
 
(66
)
Amortization of prior service costs (credits)
3

 
2

Amortization of actuarial losses (gains)
5

 
11

Settlement losses
1

 
—

Total International
37

 
33

Net Periodic Pension Benefit Costs
$
216

 
$
229

Other Benefits*
 
 
 
Service cost
$
9

 
$
13

Interest cost
24

 
21

Amortization of prior service costs (credits)
(7
)
 
(7
)
Amortization of actuarial losses (gains)
(1
)
 
4

Net Periodic Other Benefit Costs
$
25

 
$
31

_ ___________________________________
* 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.