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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
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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