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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table summarizes the components of net periodic pension cost and the cost of other postretirement benefits for the periods presented:


Three Months Ended March 31,


United States
Pension Benefits

Foreign
Pension Benefits

Other Postretirement
Benefits
Millions of dollars

2020

2019

2020

2019

2020

2019
Service cost

$
1


$
1


$
2


$
1


$
2


$
2

Interest cost

25


31


4


6


3


4

Expected return on plan assets

(41
)

(44
)

(8
)

(7
)

—


—

Amortization:












Actuarial loss

15


12


3


2


—


—

Prior service credit

—


(1
)

—


—


(2
)

(2
)
Settlement and curtailment (gain) loss

—


—


—


1


—


(7
)
Net periodic benefit cost (credit)

$
—


$
(1
)

$
1


$
3


$
3


$
(3
)
 
 
 
 
 
 
 
 
 
 
 
 
 
The following table summarizes the net periodic cost recognized in operating profit and interest and sundry (income) expense for the periods presented:
 
 
Three Months Ended March 31,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Operating profit (loss)
 
$
1

 
$
1

 
$
2

 
$
1

 
$
2

 
$
2

Interest and sundry (income) expense
 
(1
)
 
(2
)
 
(1
)
 
2

 
1

 
(5
)
Net periodic benefit cost
 
$
—

 
$
(1
)
 
$
1

 
$
3

 
$
3

 
$
(3
)