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Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | The following table presents additional information about our international pension plans.
| December 31
Millions of dollars | 2017 | 2016
Amounts recognized on the Consolidated Balance Sheets |  |
Accrued employee compensation and benefits | $ | 15 |  | $ | 16 |
Employee compensation and benefits | 267 |  | 227 |
Pension plans in which projected benefit obligation exceeded plan assets |  |
Projected benefit obligation | $ | 1,202 |  | $ | 1,083 |
Fair value of plan assets | 920 |  | 840 |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |
Accumulated benefit obligation | $ | 1,139 |  | $ | 1,037 |
Fair value of plan assets | 920 |  | 840 |
Schedule of Allocation of Plan Assets [Table Text Block] | The following table sets forth the fair values of assets held by our international pension plans by level within the fair value hierarchy.
Millions of dollars | Level 1 | Level 2 | Level 3 | Total
Cash and equivalents | $ | — |  | $ | 11 |  | $ | — |  | $ | 11 |
Common/collective trust funds (a) |  |  |  |
Equity funds (b) | — |  | 204 |  | — |  | 204 |
Bond funds (c) | — |  | 323 |  | 46 |  | 369 |
Alternatives funds (d) | — |  | 184 |  | — |  | 184 |
Real estate funds (e) | — |  | 98 |  | 28 |  | 126 |
Other assets | 7 |  | 22 |  | 17 |  | 46 |
Fair value of plan assets at December 31, 2017 | $ | 7 |  | $ | 842 |  | $ | 91 |  | $ | 940 |
Cash and equivalents | $ | — |  | $ | 49 |  | $ | — |  | $ | 49 |
Common/collective trust funds (a) |  |  |  |
Equity funds (b) | — |  | 197 |  | — |  | 197 |
Bond funds (c) | — |  | 232 |  | 44 |  | 276 |
Alternatives fund (d) | — |  | 221 |  | — |  | 221 |
Real estate funds (e) | — |  | 36 |  | 35 |  | 71 |
Other assets | 5 |  | 20 |  | 26 |  | 51 |
Fair value of plan assets at December 31, 2016 | $ | 5 |  | $ | 755 |  | $ | 105 |  | $ | 865 |
(a) Common/collective trust funds are valued at the net asset value of units held by the plans at year-end. (b) Strategy is to invest in diversified funds of global common stocks. (c) Strategy is to invest in diversified funds of fixed income securities of varying geographies and credit quality and whose cash flows approximate the maturities of the benefit obligation. (d) Strategy is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities and currencies. (e) Strategy is to invest in diversified funds of real estate investment trusts and private real estate.
Schedule of Assumptions Used [Table Text Block] | Certain weighted-average actuarial assumptions used to determine benefit obligations of our international pension plans at December 31 were as follows:
| 2017 | 2016
Discount rate | 2.8% | 2.9%
Rate of compensation increase | 5.5% | 4.8%
Certain weighted-average actuarial assumptions used to determine net periodic benefit cost of our international pension plans for the years ended December 31 were as follows:
| 2017 | 2016 | 2015
Discount rate | 2.9% | 4.2% | 4.1%
Expected long-term return on plan assets | 4.2% | 5.3% | 5.9%
Rate of compensation increase | 4.8% | 5.4% | 5.3%

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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