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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 8,891	$ 6,671
Costs and other deductions	3,915	3,375
Net income attributable to TCO	$ 3,502	$ 2,327
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%

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