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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit costs for 2017 and 2016 are as follows:
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2017
 
2016
 
2017
 
2016
 
(Millions of dollars)
Pension Benefits
 
 
 
 
 
 
 
United States
 
 
 
 
 
 
 
Service cost
$
122

 
$
123

 
$
366

 
$
370

Interest cost
91

 
95

 
274

 
283

Expected return on plan assets
(149
)
 
(181
)
 
(447
)
 
(542
)
Amortization of prior service credits
(1
)
 
(2
)
 
(3
)
 
(6
)
Amortization of actuarial losses
85

 
84

 
255

 
251

Settlement losses
169

 
162

 
325

 
324

Total United States
317

 
281

 
770

 
680

International
 
 
 
 
 
 
 
Service cost
38

 
37

 
114

 
120

Interest cost
54

 
68

 
164

 
198

Expected return on plan assets
(61
)
 
(61
)
 
(178
)
 
(184
)
Amortization of prior service costs
3

 
1

 
9

 
11

Amortization of actuarial losses
11

 
14

 
33

 
37

Settlement losses
—

 
1

 
—

 
18

Total International
45

 
60

 
142

 
200

Net Periodic Pension Benefit Costs
$
362

 
$
341

 
$
912

 
$
880

Other Benefits*
 
 
 
 
 
 
 
Service cost
$
8

 
$
15

 
$
24

 
$
45

Interest cost
23

 
32

 
71

 
96

Amortization of prior service costs
(7
)
 
3

 
(21
)
 
10

Amortization of actuarial losses
(1
)
 
5

 
(4
)
 
15

Net Periodic Other Benefit Costs
$
23

 
$
55

 
$
70

 
$
166

___________________________________
* 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.