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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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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 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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