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Pension and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2013
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 March 31,
 
 
United States
Pension Benefits
 
Foreign Pension
Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
—

 
$
—

 
$
2

 
$
2

 
$
1

 
$
1

Interest cost
 
41

 
45

 
4

 
4

 
5

 
6

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

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
16

 
11

 
2

 
1

 
—

 
—

Prior service credit
 
(1
)
 
(1
)
 
—

 
—

 
(10
)
 
(12
)
Settlement and curtailment loss
 
—

 
2

 
—

 
—

 
—

 
—

Net periodic benefit cost (credit)
 
$
8

 
$
9

 
$
5

 
$
5

 
$
(4
)
 
$
(5
)