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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Pension and Postretirement Plans The components of net periodic benefit cost for the three and six months ended June 30, 2016 and 2015, were as follows:
| Millions of Dollars
| Pension Benefits |  | Other Benefits
| 2016 |  | 2015 |  | 2016 |  |  | 2015 |
| U.S. |  |  | Int’l. |  |  | U.S. |  |  | Int’l. |  |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Three Months Ended June 30 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 32 |  |  | 9 |  |  | 31 |  |  | 10 |  |  | 2 |  |  | 2 |
Interest cost | 29 |  |  | 8 |  |  | 27 |  |  | 7 |  |  | 2 |  |  | 2 |
Expected return on plan assets | (32 | ) |  | (10 | ) |  | (35 | ) |  | (9 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | — |  |  | (1 | ) |  | 1 |  |  | (1 | ) |  | (1 | ) |  | (1 | )
Recognized net actuarial loss (gain) | 18 |  |  | 3 |  |  | 18 |  |  | 4 |  |  | — |  |  | (1 | )
Settlements | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 47 |  |  | 9 |  |  | 42 |  |  | 11 |  |  | 3 |  |  | 2 |
Six Months Ended June 30 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 64 |  |  | 18 |  |  | 62 |  |  | 20 |  |  | 4 |  |  | 4 |
Interest cost | 58 |  |  | 15 |  |  | 54 |  |  | 14 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (64 | ) |  | (20 | ) |  | (70 | ) |  | (19 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 1 |  |  | (1 | ) |  | 2 |  |  | (1 | ) |  | (1 | ) |  | (1 | )
Recognized net actuarial loss (gain) | 36 |  |  | 7 |  |  | 37 |  |  | 8 |  |  | — |  |  | (1 | )
Settlements | 3 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 98 |  |  | 19 |  |  | 86 |  |  | 22 |  |  | 7 |  |  | 6 |
During the first half of 2016, we contributed $11 million to our U.S. benefit plans and $22 million to our international benefit plans. We currently expect to make additional contributions of approximately $325 million to our U.S. benefit plans and $20 million to our international benefit plans during the remainder of 2016. The majority of the additional contributions is discretionary and intended to improve the funded status of our U.S. pension plans.

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