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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2016

2015

2016

2015

2016

2015
Service cost
 
$
—

 
$
—

 
$
2

 
$
2

 
$
2

 
$
—

Interest cost
 
37

 
37

 
7

 
7

 
4

 
5

Expected return on plan assets
 
(46
)
 
(47
)
 
(8
)
 
(9
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
11

 
14

 
1

 
2

 
—

 
—

Prior service credit
 
(1
)
 
(1
)
 
—

 
—

 
(4
)
 
(5
)
Settlement and curtailment (gain) loss
 
—

 
—

 
(1
)
 
4

 
—

 
—

Net periodic cost
 
$
1

 
$
3

 
$
1

 
$
6

 
$
2

 
$
—


 
 
Six Months Ended June 30,
 
 
United States
Pension Benefits
 
Foreign
Pension Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
1

 
$
1

 
$
3

 
$
3

 
$
4

 
$
1

Interest cost
 
74

 
75

 
14

 
15

 
8

 
10

Expected return on plan assets
 
(93
)
 
(95
)
 
(16
)
 
(17
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
23

 
27

 
2

 
3

 
—

 
—

Prior service credit
 
(2
)
 
(2
)
 
—

 
—

 
(8
)
 
(14
)
Settlement and curtailment (gain) loss
 
—

 
—

 
—

 
12

 
—

 
(47
)
Net periodic benefit cost (credit)
 
$
3

 
$
6

 
$
3

 
$
16

 
$
4

 
$
(50
)