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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,


United States
Pension Benefits

Foreign
Pension Benefits

Other Postretirement
Benefits
Millions of dollars

2018

2017

2018

2017

2018

2017
Service cost

$
1


$
1


$
1


$
1


$
2


$
1

Interest cost

30


34


5


6


3


4

Expected return on plan assets

(43
)

(43
)

(8
)

(8
)

—


—

Amortization:












Actuarial loss

14


12


2


2


—


—

Prior service credit

(1
)

(1
)

—


—


(3
)

(4
)
Settlement and curtailment (gain) loss

—


—


1


—


4


—

Net periodic cost

$
1


$
3


$
1


$
1


$
6


$
1

 
 
Nine Months Ended September 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2

 
$
2

 
$
4

 
$
4

 
$
5

 
$
5

Interest cost
 
89

 
101

 
17

 
17

 
10

 
12

Expected return on plan assets
 
(128
)
 
(131
)
 
(25
)
 
(23
)
 
—

 
—

Amortization:
 

 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
40

 
37

 
7

 
5

 
—

 
—

Prior service credit
 
(2
)
 
(2
)
 
—

 
—

 
(2
)
 
(11
)
Settlement and curtailment (gain) loss
 
—

 
—

 
(2
)
 
1

 
4

 
—

Net periodic cost
 
$
1

 
$
7

 
$
1

 
$
4

 
$
17

 
$
6






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 September 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Operating profit (loss)
 
$
1

 
$
1

 
$
1

 
$
1

 
$
2

 
$
1

Interest and sundry (income) expense
 
—

 
2

 
—

 
—

 
4

 
—

Net periodic benefit cost
 
$
1

 
$
3

 
$
1

 
$
1

 
$
6

 
$
1

 
 
Nine Months Ended September 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Operating profit (loss)
 
$
2

 
$
2

 
$
4

 
$
4

 
$
5

 
$
5

Interest and sundry (income) expense
 
(1
)
 
5

 
(3
)
 
—

 
12

 
1

Net periodic benefit cost
 
$
1

 
$
7

 
$
1

 
$
4

 
$
17

 
$
6