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Pension and Other Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 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 September 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 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost |  | 41 |  |  | 45 |  |  | 5 |  |  | 6 |  |  | 4 |  |  | 5 |
Expected return on plan assets |  | (48 | ) |  | (48 | ) |  | (3 | ) |  | (3 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  | 16 |  |  | 11 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |
Prior service credit |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (10 | ) |  | (11 | )
Settlement and curtailment loss |  | 3 |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | (3 | )
Net periodic benefit cost (credit) |  | $ | 12 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | (4 | ) |  | $ | (7 | )
|  | Nine Months Ended September 30,
|  | United States Pension Benefits |  | Foreign Pension Benefits |  | Other Postretirement Benefits
Millions of dollars |  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | 3 |  |  | $ | 5 |
Interest cost |  | 122 |  |  | 134 |  |  | 13 |  |  | 15 |  |  | 13 |  |  | 16 |
Expected return on plan assets |  | (144 | ) |  | (145 | ) |  | (8 | ) |  | (8 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  | 47 |  |  | 34 |  |  | 5 |  |  | 3 |  |  | 1 |  |  | — |
Prior service credit |  | (2 | ) |  | (3 | ) |  | — |  |  | — |  |  | (29 | ) |  | (34 | )
Settlement and curtailment loss |  | 3 |  |  | 5 |  |  | 1 |  |  | 1 |  |  | — |  |  | (52 | )
Net periodic benefit cost (credit) |  | $ | 28 |  |  | $ | 27 |  |  | $ | 15 |  |  | $ | 16 |  |  | $ | (12 | ) |  | $ | (65 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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