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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016 are as follows:
|  |  |  |  |  | Fair Value
|  | Total Cost Basis |  | Level 1 |  | Level 2 |  | Total
Millions of dollars |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Money market funds(1) |  | $ | 10 |  |  | $ | 29 |  |  | $ | 10 |  |  | $ | 29 |  |  | $ | — |  |  | $ | — |  |  | $ | 10 |  |  | $ | 29 |
Net derivative contracts |  | — |  |  | — |  |  |  |  |  | — |  |  | (56 | ) |  | 41 |  |  | (56 | ) |  | 41 |
Available for sale investments |  | 5 |  |  | 4 |  |  | 16 |  |  | 16 |  |  | — |  |  | — |  |  | 16 |  |  | 16 |
(1)Money market funds are comprised primarily of government obligations and other first tier obligations.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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