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Pension and Other Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2014
General Discussion of Pension and Other Postretirement 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 June 30,
 
 
United States
Pension Benefits
 
Foreign Pension
Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
 
$
1

 
$
1

 
$
2

 
$
1

 
$
—

 
$
1

Interest cost
 
42

 
40

 
5

 
4

 
6

 
4

Expected return on plan assets
 
(48
)
 
(48
)
 
(3
)
 
(2
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
10

 
15

 
1

 
1

 
—

 
—

Prior service credit
 
(1
)
 
—

 
—

 
—

 
(9
)
 
(9
)
Settlement and curtailment loss
 
—

 
—

 
2

 
1

 
—

 
—

Net periodic benefit cost (credit)
 
$
4

 
$
8

 
$
7

 
$
5

 
$
(3
)
 
$
(4
)

 
 
Six Months Ended June 30,
 
 
United States
Pension Benefits
 
Foreign Pension
Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
 
$
1

 
$
1

 
$
3

 
$
3

 
$
1

 
$
2

Interest cost
 
84

 
81

 
9

 
8

 
12

 
9

Expected return on plan assets
 
(96
)
 
(96
)
 
(6
)
 
(5
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
21

 
31

 
3

 
3

 
—

 
—

Prior service credit
 
(2
)
 
(1
)
 
—

 
—

 
(19
)
 
(19
)
Settlement and curtailment loss
 
—

 
—

 
2

 
1

 
—

 
—

Net periodic benefit cost (credit)
 
$
8

 
$
16

 
$
11

 
$
10

 
$
(6
)
 
$
(8
)