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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30,


United States
Pension Benefits

Foreign
Pension Benefits

Other Postretirement
Benefits
Millions of dollars

2019

2018

2019

2018

2019

2018
Service cost

$
—


$
—


$
2


$
2


$
1


$
1

Interest cost

31


29


6


6


4


3

Expected return on plan assets

(45
)

(42
)

(8
)

(9
)

—


—

Amortization:












Actuarial loss

12


13


2


2


—


—

Prior service credit

—


—


—


—


(3
)

(2
)
Settlement and curtailment (gain) loss

—


—


—


(3
)

—


—

Net periodic benefit cost (credit)

$
(2
)

$
—


$
2


$
(2
)

$
2


$
2


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
1

 
$
1

 
$
3

 
$
3

 
$
3

 
$
3

Interest cost
 
62

 
59

 
12

 
12

 
8

 
7

Expected return on plan assets
 
(89
)
 
(85
)
 
(15
)
 
(17
)
 
—

 
—

Amortization:
 

 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
24

 
26

 
4

 
5

 
—

 
—

Prior service credit
 
(1
)
 
(1
)
 
—

 
—

 
(5
)
 
1

Settlement and curtailment (gain) loss
 
—

 
—

 
1

 
(3
)
 
(7
)
 
—

Net periodic benefit cost (credit)
 
$
(3
)
 
$
—

 
$
5

 
$
—

 
$
(1
)
 
$
11


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 June 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Operating profit (loss)
 
$
—

 
$
—

 
$
2

 
$
2

 
$
1

 
$
1

Interest and sundry (income) expense
 
(2
)
 
—

 
—

 
(4
)
 
1

 
1

Net periodic benefit cost
 
$
(2
)
 
$
—

 
$
2

 
$
(2
)
 
$
2

 
$
2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Operating profit (loss)
 
$
1

 
$
1

 
$
3

 
$
3

 
$
3

 
$
3

Interest and sundry (income) expense
 
(4
)
 
(1
)
 
2

 
(3
)
 
(4
)
 
8

Net periodic benefit cost
 
$
(3
)
 
$
—

 
$
5

 
$
—

 
$
(1
)
 
$
11