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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
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

2019

2018

2019

2018

2019

2018
Service cost

$
1


$
1


$
1


$
1


$
2


$
2

Interest cost

31


30


6


6


4


4

Expected return on plan assets

(44
)

(43
)

(7
)

(8
)

—


—

Amortization:












Actuarial loss

12


13


2


3


—


—

Prior service cost (credit)

(1
)

(1
)

—


—


(2
)

3

Settlement and curtailment (gain) loss

—


—


1


—


(7
)

—

Net periodic benefit cost (credit)

$
(1
)

$
—


$
3


$
2


$
(3
)

$
9

 
 
 
 
 
 
 
 
 
 
 
 
 
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
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Operating profit (loss)
 
$
1

 
$
1

 
$
1

 
$
1

 
$
2

 
$
2

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

 
1

 
(5
)
 
7

Net periodic benefit cost
 
$
(1
)
 
$
—

 
$
3

 
$
2

 
$
(3
)
 
$
9