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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 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
September 30
 
Nine Months Ended
September 30
 
2019
 
2018
 
2019
 
2018
 
(Millions of dollars)
Pension Benefits
 
 
 
 
 
 
 
United States
 
 
 
 
 
 
 
Service cost
$
101

 
$
120

 
$
304

 
$
360

Interest cost
100

 
93

 
298

 
278

Expected return on plan assets
(141
)
 
(159
)
 
(423
)
 
(477
)
Amortization of prior service costs (credits)
—

 
—

 
1

 
1

Amortization of actuarial losses (gains)
60

 
76

 
179

 
228

Settlement losses
87

 
128

 
207

 
260

Total United States
207

 
258

 
566

 
650

International
 
 
 
 
 
 
 
Service cost
34

 
36

 
105

 
109

Interest cost
49

 
49

 
153

 
155

Expected return on plan assets
(56
)
 
(62
)
 
(171
)
 
(193
)
Amortization of prior service costs (credits)
3

 
2

 
9

 
8

Amortization of actuarial losses (gains)
4

 
6

 
15

 
23

Settlement losses
—

 
3

 
1

 
3

Total International
34

 
34

 
112

 
105

Net Periodic Pension Benefit Costs
$
241

 
$
292

 
$
678

 
$
755

Other Benefits*
 
 
 
 
 
 
 
Service cost
$
9

 
$
10

 
$
27

 
$
31

Interest cost
24

 
24

 
72

 
72

Amortization of prior service costs (credits)
(7
)
 
(7
)
 
(21
)
 
(21
)
Amortization of actuarial losses (gains)
(1
)
 
4

 
(2
)
 
11

Net Periodic Other Benefit Costs
$
25

 
$
31

 
$
76

 
$
93

_ ___________________________________
* 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.