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Other Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Goodwill | $ 4,531 | $ 4,581 |
Segment Reporting Information [Line Items] |  |  |
Gains on sale of nonstrategic properties | 1,800 | 800 |
Company share of equity affiliates foreign currency effects | (45) | 1 | $ 344
Gain (loss) for impairments and other assets write-offs | 900 | 2,900 |
Total financing interest and debt costs | 902 | 753 | 495
Less: Capitalized interest | 595 | 552 | 495
Interest and debt expense | 307 | 201 | 0
Research and development expenses | 433 | 476 | 601
Excess of replacement cost over the carrying value of inventories (LIFO method) | 3,937 | 2,942 | 3,745
LIFO losses on inventory drawdowns included in earnings | (5) | (88) | (65)
Foreign currency effects | (446) | 58 | $ 769
Downstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Gains on sale of nonstrategic properties | 850 | 600 |
Gain (loss) for impairments and other assets write-offs |  | 110 |
Upstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Gains on sale of nonstrategic properties | 950 | $ 200 |
Unocal |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 4,531 |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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