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Summarized Financial Data - Tengizchevroil LLP (Details 1) - Tengizchevroil LLP - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Affiliate Statements Captions [Line Items] |  |
Current assets | $ 4,239 | $ 7,001
Other assets | 26,411 | 20,476
Current liabilities | 2,517 | 2,841
Other liabilities | 6,266 | 6,210
Total net equity | $ 21,867 | $ 18,426

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