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Summarized Financial Data - Tengizchevroil LLP - Summary of Balance Sheet Information (Details) - Tengizchevroil LLP - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Affiliate Statements Captions [Line Items] |  |
Current assets | $ 2,374 | $ 4,239
Other assets | 34,727 | 26,411
Current liabilities | 3,069 | 2,517
Other liabilities | 6,357 | 6,266
Total affiliates' net equity | $ 27,675 | $ 21,867

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