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Pension and Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement 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 September 30,
|  | United States Pension Benefits |  | Foreign Pension Benefits |  | Other Postretirement Benefits
Millions of dollars |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost |  | 30 |  |  | 34 |  |  | 5 |  |  | 6 |  |  | 3 |  |  | 4 |
Expected return on plan assets |  | (43 | ) |  | (43 | ) |  | (8 | ) |  | (8 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  | 14 |  |  | 12 |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Prior service credit |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (3 | ) |  | (4 | )
Settlement and curtailment (gain) loss |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 4 |  |  | — |
Net periodic cost |  | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |
|  | Nine Months Ended September 30,
|  | United States Pension Benefits |  | Foreign Pension Benefits |  | Other Postretirement Benefits
Millions of dollars |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | 5 |
Interest cost |  | 89 |  |  | 101 |  |  | 17 |  |  | 17 |  |  | 10 |  |  | 12 |
Expected return on plan assets |  | (128 | ) |  | (131 | ) |  | (25 | ) |  | (23 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  | 40 |  |  | 37 |  |  | 7 |  |  | 5 |  |  | — |  |  | — |
Prior service credit |  | (2 | ) |  | (2 | ) |  | — |  |  | — |  |  | (2 | ) |  | (11 | )
Settlement and curtailment (gain) loss |  | — |  |  | — |  |  | (2 | ) |  | 1 |  |  | 4 |  |  | — |
Net periodic cost |  | $ | 1 |  |  | $ | 7 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 17 |  |  | $ | 6 |
The following table summarizes the net periodic cost recognized in operating profit and interest and sundry (income) expense for the periods presented:
|  | Three Months Ended September 30,
|  | United States Pension Benefits |  | Foreign Pension Benefits |  | Other Postretirement Benefits
Millions of dollars |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Operating profit (loss) |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest and sundry (income) expense |  | — |  |  | 2 |  |  | — |  |  | — |  |  | 4 |  |  | — |
Net periodic benefit cost |  | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |
|  | Nine Months Ended September 30,
|  | United States Pension Benefits |  | Foreign Pension Benefits |  | Other Postretirement Benefits
Millions of dollars |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Operating profit (loss) |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 5 |  |  | $ | 5 |
Interest and sundry (income) expense |  | (1 | ) |  | 5 |  |  | (3 | ) |  | — |  |  | 12 |  |  | 1 |
Net periodic benefit cost |  | $ | 1 |  |  | $ | 7 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 17 |  |  | $ | 6 |

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