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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at June 30, 2018, and December 31, 2017, is as follows: Assets and Liabilities Measured at Fair Value on a Recurring Basis (Millions of dollars)
| At June 30, 2018 |  | At December 31, 2017
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Marketable Securities | $ | 58 |  |  | $ | 58 |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |
Derivatives | 7 |  |  | 1 |  |  | 6 |  |  | — |  |  | 22 |  |  | — |  |  | 22 |  |  | — |
Total Assets at Fair Value | $ | 65 |  |  | $ | 59 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 31 |  |  | $ | 9 |  |  | $ | 22 |  |  | $ | — |
Derivatives | 184 |  |  | 117 |  |  | 67 |  |  | — |  |  | 124 |  |  | 78 |  |  | 46 |  |  | — |
Total Liabilities at Fair Value | $ | 184 |  |  | $ | 117 |  |  | $ | 67 |  |  | $ | — |  |  | $ | 124 |  |  | $ | 78 |  |  | $ | 46 |  |  | $ | — |
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis | The fair value hierarchy for assets and liabilities measured at fair value on a nonrecurring basis at June 30, 2018, is as follows: Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Millions of dollars)
| At June 30, 2018
|  |  |  |  |  |  |  |  | Before-Tax Loss
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Three Months Ended |  | Six Months Ended
Properties, plant and equipment, net (held and used) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Properties, plant and equipment, net (held for sale) | 88 |  |  | — |  |  | 88 |  |  | — |  |  | 134 |  |  | 297 |
Investments and advances | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Total Assets at Fair Value | $ | 88 |  |  | $ | — |  |  | $ | 88 |  |  | $ | — |  |  | $ | 134 |  |  | $ | 298 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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