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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The following table summarizes the difference between income tax expense at the U.S. statutory rate of 21% and 35%, respectively, and the income tax expense at effective worldwide tax rates for the respective periods:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
Millions of dollars |  | 2018 |  | 2017 |  | 2018 |  | 2017
Earnings (loss) before income taxes |  | $ | (609 | ) |  | $ | 212 |  |  | $ | (500 | ) |  | $ | 410 |
Income tax expense computed at United States statutory tax rate |  | (128 | ) |  | 74 |  |  | (105 | ) |  | 143 |
Valuation allowances |  | 39 |  |  | 6 |  |  | 39 |  |  | 7 |
Audits and settlements |  | (3 | ) |  | (9 | ) |  | (3 | ) |  | (6 | )
U.S. foreign income items, net of credits |  | (34 | ) |  | (34 | ) |  | (45 | ) |  | (53 | )
Non deductible impairments |  | 138 |  |  | — |  |  | 138 |  |  | — |
Non deductible government payments |  | 37 |  |  | — |  |  | 37 |  |  | — |
Other |  | (19 | ) |  | (4 | ) |  | (16 | ) |  | (18 | )
Income tax expense computed at effective worldwide tax rates |  | $ | 30 |  |  | $ | 33 |  |  | $ | 45 |  |  | $ | 73 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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