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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit costs for 2018 and 2017 are as follows:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Millions of dollars)
Pension Benefits |  |  |  |  |  |  |
United States |  |  |  |  |  |  |
Service cost | $ | 120 |  |  | $ | 122 |  |  | $ | 240 |  |  | $ | 244 |
Interest cost | 93 |  |  | 92 |  |  | 185 |  |  | 183 |
Expected return on plan assets | (159 | ) |  | (149 | ) |  | (318 | ) |  | (298 | )
Amortization of prior service credits | — |  |  | (1 | ) |  | 1 |  |  | (2 | )
Amortization of actuarial losses | 76 |  |  | 85 |  |  | 152 |  |  | 170 |
Settlement losses | 66 |  |  | 78 |  |  | 132 |  |  | 156 |
Total United States | 196 |  |  | 227 |  |  | 392 |  |  | 453 |
International |  |  |  |  |  |  |
Service cost | 33 |  |  | 39 |  |  | 73 |  |  | 76 |
Interest cost | 60 |  |  | 57 |  |  | 106 |  |  | 110 |
Expected return on plan assets | (65 | ) |  | (59 | ) |  | (131 | ) |  | (117 | )
Amortization of prior service costs | 4 |  |  | 3 |  |  | 6 |  |  | 6 |
Amortization of actuarial losses | 6 |  |  | 13 |  |  | 17 |  |  | 22 |
Settlement losses | — |  |  | — |  |  | — |  |  | — |
Total International | 38 |  |  | 53 |  |  | 71 |  |  | 97 |
Net Periodic Pension Benefit Costs | $ | 234 |  |  | $ | 280 |  |  | $ | 463 |  |  | $ | 550 |
Other Benefits* |  |  |  |  |  |  |
Service cost | $ | 8 |  |  | $ | 8 |  |  | $ | 21 |  |  | $ | 16 |
Interest cost | 27 |  |  | 25 |  |  | 48 |  |  | 48 |
Amortization of prior service costs | (7 | ) |  | (7 | ) |  | (14 | ) |  | (14 | )
Amortization of actuarial losses | 3 |  |  | (2 | ) |  | 7 |  |  | (3 | )
Net Periodic Other Benefit Costs | $ | 31 |  |  | $ | 24 |  |  | $ | 62 |  |  | $ | 47 |
___________________________________ * Includes costs for U.S. and international OPEB plans. Obligations for plans outside the United States are not significant relative to the company’s total OPEB obligation.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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