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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
General Discussion of Pension and Other Postretirement 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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
1

 
$
1

 
$
1

 
$
1

 
$
2

 
$
1

Interest cost
 
37

 
38

 
7

 
8

 
4

 
5

Expected return on plan assets
 
(47
)
 
(48
)
 
(8
)
 
(8
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
12

 
13

 
1

 
1

 
—

 
—

Prior service credit
 
(1
)
 
(1
)
 
—

 
—

 
(4
)
 
(9
)
Settlement and curtailment (gain) loss
 
—

 
—

 
1

 
8

 
—

 
(47
)
Net periodic benefit cost (credit)
 
$
2

 
$
3

 
$
2

 
$
10

 
$
2

 
$
(50
)