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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
1

 
$
1

 
$
1

 
$
1

 
$
1

 
$
2

Interest cost
 
40

 
44

 
4

 
5

 
4

 
5

Expected return on plan assets
 
(48
)
 
(49
)
 
(2
)
 
(3
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
15

 
12

 
1

 
1

 
—

 
—

Prior service credit
 
—

 
(1
)
 
—

 
—

 
(9
)
 
(11
)
Settlement and curtailment loss
 
—

 
2

 
1

 
—

 
—

 
(49
)
Net periodic benefit cost (credit)
 
$
8

 
$
9

 
$
5

 
$
4

 
$
(4
)
 
$
(53
)

 
 
Six Months Ended June 30,
 
 
United States
Pension Benefits
 
Foreign Pension
Benefits
 
Other Postretirement
Benefits
Millions of dollars
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
 
$
1

 
$
1

 
$
3

 
$
3

 
$
2

 
$
3

Interest cost
 
81

 
89

 
8

 
9

 
9

 
11

Expected return on plan assets
 
(96
)
 
(97
)
 
(5
)
 
(5
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss
 
31

 
23

 
3

 
2

 
—

 
—

Prior service credit
 
(1
)
 
(2
)
 
—

 
—

 
(19
)
 
(23
)
Settlement and curtailment loss
 
—

 
4

 
1

 
—

 
—

 
(49
)
Net periodic benefit cost (credit)
 
$
16

 
$
18

 
$
10

 
$
9

 
$
(8
)
 
$
(58
)