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Pension and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Plans PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
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
)


401(k) Defined Contribution Plan

During March 2020, we announced that the company matching contributions for our 401(k) defined contribution plan, equal to up to 7% of participants' eligible compensation, covering substantially all U.S. employees will be contributed in company stock starting from May 2020.