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Other Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 4,518 | $ 4,531 |  |
Segment Reporting Information [Line Items] |  |  |  |
Gains on sale of nonstrategic properties | 630 | 1,800 |  |
Company share of equity affiliates foreign currency effects | 416 | (45) | $ 1 |
Total financing interest and debt costs | 921 | 902 | 753 |
Less: Capitalized interest | 173 | 595 | 552 |
Interest and debt expense | 748 | 307 | 201 |
Research and development expenses | 453 | 433 | 476 |
Excess of replacement cost over the carrying value of inventories (LIFO method) | 5,134 | 3,937 | 2,942 |
LIFO profits (losses) on inventory drawdowns included in earnings | 26 | (5) | (88) |
Foreign currency effects | 611 | (446) | $ 58 |
Downstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gains on sale of nonstrategic properties | 365 | 850 |  |
Upstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gains on sale of nonstrategic properties | 265 | 950 |  |
Gain (loss) for impairments and other assets write-offs | $ 2,000 | $ 900 |  |
Unocal |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | $ 4,518

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